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Tytuł:
Analytical analysis of cavitating flow in Venturi tube on the basis of experimental data
Autorzy:
Niedźwiedzka, A.
Sobieski, W.
Powiązania:
https://bibliotekanauki.pl/articles/298422.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
cavitation
Venturi tube
mass flow rate
Opis:
The content of this article is a direct continuation of the prior experimental works on the topic of cloud cavitation in Venturis. The results of the experimental tests were used to create a set of characteristics for three types of Venturis. The article has two aims: 1) verification of the similarity between the characteristics obtained and reported in the literature, 2) verification of the range of the obtained characteristics with respect to parallel diagrams. Both aims were achieved, which confirms that the quality of the prior results of the experimental measurements is at least sufficient to realize the main objective of the whole project: creation of numerical models of cavitating flow in Venturis. The literature overview showed that the issue has been not solved until today, even at the qualitative level. This reason was the motivation for the undertaken research, including contents of the article.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2016, 19(3); 215-229
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hole extension effect on transpiration flow efficiency
Autorzy:
Lewandowski, T.
Doerffer, P.
Powiązania:
https://bibliotekanauki.pl/articles/1938639.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska
Tematy:
perforated wall
L/D ratio
mass flow rate
efficiency
Opis:
The present analysis of the hole extension effect on the transpiration flow efficiency is a part of the research [1] which aims at defining a physical transpiration model of the flow through perforated plates. Perforated walls find a wide use as a method of flow control and effusive cooling. Some data on the L/D (hole length to diameter ratio) effect on the flow structure and mass flow rate may be found in the literature [2, 3], but all those works concern holes of a diameter at least one order of magnitude larger than those used in the simulations presented in this paper. Due to the size of the analyzed holes and their cylindrical shape, the only method of analysing the flow through such holes is the numerical method. In the conducted simulations, the holes were D = 0.6 mm, 0.3 mm and 0.125 mm in diameter and the perforation values were equal to 4%, 5%, 8% and 10%. The L/D ratio was changed between 0.25 and 8. The data bank of the flow through the cylindrical holes was produced. The hole extension has a significant influence on the obtained mass flow rate and, consequently, on the transpiration flow efficiency. In addition, entrance effects appear to be important.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2015, 19, 2; 121-128
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studia nad przepływem masy w suszarniach o przepływie mieszanym
Investigations of the mass flow in the mixed-flow dryers
Autorzy:
Kocsis, L.
Meszaros, C.
Farkas, I.
Powiązania:
https://bibliotekanauki.pl/articles/239065.pdf
Data publikacji:
2009
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
ziarno
suszenie
przepływ masy
wilgotność
drying
mass flow
moisture
Opis:
Suszenie jest jednym z ważniejszych i najbardziej niezbędnych zabiegów w produkcji rolnej. Około 30% ziarna po zbiorze wymaga suszenia. Proces suszenia jest jednak bardzo energochłonny, a w wielu przypadkach nieprzyjazny dla środowiska ze względu na spalanie paliw kopalnych w celu uzyskania niezbędnej energii cieplnej. Chociaż suszarnie o przepływie mieszanym są szeroko stosowane, wciąż istnieje potrzeba optymalizacji wielu procesów cząstkowych. Na przykład, występują duże różnice w prędkości pionowej partii ziarna, co powoduje różnice w czasie ich ekspozycji. W rezultacie mamy do czynienia z nierównomiernym wysychaniem, a w konsekwencji z niedosuszaniem lub przesuszaniem poszczególnych partii materiału. Przeprowadzone badania miały na celu określenie oddziaływania ścianek komory suszenia oraz daszkowych kanałów powietrznych, na rozkład prędkości masy ziarna. Opracowanie przedstawia wyniki doświadczeń z przepływem ziarna. W przyszłych działaniach przewiduje się opracowanie modelu PFC dla przepływu masy ziarna, co umożliwi doskonalsze prognozowanie przebiegu procesu suszenia.
Drying is one of the most important and most significant operations in agricultural business. Approximately 30% of the grain must be dry after harvesting. The energy consumption of the drying process is extremely high and in many cases it is not environment friendly because of the combustion of fossil fuels to produce the required heat energy. Although the mixed-flow dryers are widely used it is still necessary to optimize many segment processes. For example there are big differences in the vertical grain particle velocity causing differences in the residence time. As a result, uneven drying occurs and, hence, under-drying or over-drying of single grain portions. To investigate the influences of the dryer walls and the air ducts on the particle velocity distribution experiments have been carried out. Hereby this work submits the results of the grain-flow experiments. In a future work a PFC model for the grain mass flow will be developed enabling improvements in the prediction of the drying process.
Źródło:
Problemy Inżynierii Rolniczej; 2009, R. 17, nr 4, 4; 83-92
1231-0093
Pojawia się w:
Problemy Inżynierii Rolniczej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental research on the influence of the pulse injector control parameters on its flow rate
Badania eksperymentalne wpływu parametrów sterowania na wydatek impulsowych wtryskiwaczy gazu
Autorzy:
Czarnigowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/133295.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
injector
mass flow
control
LPG
CNG
wtryskiwacz
wydatek
sterowanie
Opis:
The paper presents the results of the impact of the control parameters on the fuel mass flow from the injector. The control parameters examined in the paper were: frequency and pulse width modulation of the modulated control signal (the second part of the injector control signal). The analysis covers 6 injector types of different design of the valve element and the coil. The experiments have shown that the frequency of the signal does not affect the injector performance, contrary to pulse modulation affecting the injector performance significantly.
W artykule przedstawiono wyniki badań stanowiskowych wpływu parametrów sterowania na wydatek wtryskiwacza. Jako parametry sterowania rozumiano wypełnienie oraz częstotliwość sygnału modulowanego, czyli drugiej części sygnału sterowania wtryskiwaczem. Przedstawiono wyniki badań stanowiskowych 6 typów wtryskiwaczy różniących się konstrukcją zarówno elementu zaworowego, jak i cewki elektromagnetycznej. Wykazano, że częstotliwość sygnału prawie nie wpływa na wydajność wtryskiwaczy, w przeciwieństwie do wypełnienia, które wpływa znacznie.
Źródło:
Combustion Engines; 2015, 54, 4; 15-20
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Slope failure on a Cambrian carbonate platform, mass-flow transitions and resulting complex deposit
Autorzy:
Wang, Zhaopeng
Liu, Jiaye
Van Loon, A. J. (Tom)
Zhu, Decheng
Qin, Peng
Han, Zuozhen
Powiązania:
https://bibliotekanauki.pl/articles/2058558.pdf
Data publikacji:
2020
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Gushan Formation
Middle Cambrian
epeiric sea
carbonate platform
mass-flow transitions
Opis:
The quiet environment of the carbonate platform in the epeiric sea that existed during the Cambrian between present-day China and Korea was occasionally affected by processes that have hitherto not been described from such a setting. A conglomerate was found in the Middle Cambrian Gushan Formation near Chengouwan (Shandong Province, E China), eroded into the underlying sediments. The conglomerate is explained as a deposit consisting of material that was eroded up-slope when slope-failure took place, resulting in a slump that passed into a high-density debris flow with erosive power that passed, in turn, again into a slump. The slump came to rest when it lost its momentum on a less inclined part of the basin slope. Immediately after deposition, fluidization occurred in the lower part of the slump deposit, as proven by a funnel-shaped water-escape structure and a lateral injection of some metres long of brecciated material.
Źródło:
Geological Quarterly; 2020, 64, 1; 3--15
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jurassic syn-rift and Cretaceous syn-orogenic, coarse-grained deposits related to opening and closure of the Vahic (South Penninic) Ocean in the Western Carpathians – an overview
Autorzy:
Plasienka, D.
Powiązania:
https://bibliotekanauki.pl/articles/2060512.pdf
Data publikacji:
2012
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Western Carpathians
Mesozoic
rifting
thrusting
deep-marine clastics
mass flow deposits
Opis:
Although no undoubted oceanic crustal rock complexes of Penninic affinity participate in the present surface structure of the Western Carpathians, indirect lines of evidence suggest prolongation of the South Penninic-Vahic oceanic tract into the ancient Carpathians. The sedimentary record of both the syn-rift and syn-orogenic clastic deposits reveal their origin between the outer Tatric (Austroalpine) and the inner Oravic (Middle Penninic) margins. The rifting regime is exemplified by the normal fault-related scarp breccias of the Jurassic Borinka Unit in the Male Karpaty Mts., which are characterized by local, gradually denuded source areas. Two other regions provide examples of a contractional regime, both related to shortening and closure of the Vahic oceanic domain. The Belice Unit in the Povazsky Inovec Mts. includes Upper Jurassic-Lower Cretaceous eupelagic, mostly siliceous deposits and a thickening-upwards Senonian sequence of turbiditic sandstones, conglomerates and chaotic breccias. It is inferred that this succession represents the sedimentary cover of oceanic crust approaching a trench, its incorporation in the accretionary complex and finally underthrusting below the outer Tatric margin. In the Oravic units of the Pieniny Klippen Belt, deep-marine conglomerate/breccia bodies with olistoliths indicate collision-related thrust stacking that started from the Maastrichtian (Gregorianka Breccia of the Sub-Pieniny Unit) and terminated with the Lower Eocene Milpos Breccia in the Saris Unit. In addition, a tentative recycling scheme of “exotic” clastic material from mid-Cretaceous conglomerates of the Klape Unit to various Klippen Belt units is outlined. This material is considered to be unrelated to the Vahic oceanic realm and its closure, and likely represents erosional products of more distant orogenic zones.
Źródło:
Geological Quarterly; 2012, 56, 4; 601--628
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pomiar parametrów przepływowych elementów pneumatycznych
Measurements of flow parameters of pneumatic elements
Autorzy:
Dindorf, R.
Powiązania:
https://bibliotekanauki.pl/articles/156435.pdf
Data publikacji:
2008
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
pomiar strumienia przepływu
charakterystyki przepływowe
termiczny przepływomierz masowy
flow measurement
flow characteristics
thermal mass flow-meter
Opis:
W artykule przedstawiono budowę i zasadę działania stanowiska pomiarowego do badania parametrów przepływowych elementów pneumatycznych. Na stanowisku pomiarowym zastosowano przepływomierz termiczny Setaram U70, zwężkę Venturiego i znormalizowaną kryzę pomiarową. Przedstawiono metodę wyznaczania charakterystyk przepływowych elementów pneumatycznych na przykładzie zespołu przygotowania powietrza typu FR (filtr, regulator ciśnienia).
In the paper an arrangement and principle of work of a measurement stand for investigations of flow parameters of pneumatic elements are described. The thermal flow-meter Setaram U70, Venturi tube and calibrated orifice is applied in this stand. A method of measurements of flow characteristics for pneumatic elements, air preparation unit FR (filter, pressure regulator), are presented.
Źródło:
Pomiary Automatyka Kontrola; 2008, R. 54, nr 1, 1; 30-32
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eustatic and tectonic control on late Eocene fan delta development (Orava Basin, Central Western Carpathians)
Autorzy:
Starek, D.
Sliva, L’.
Vojtko, R.
Powiązania:
https://bibliotekanauki.pl/articles/2058980.pdf
Data publikacji:
2012
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Paleogene
Orava
Western Carpathians
fan delta
mass flow deposits
coarse-grained delta
Opis:
The evolution of the Central Carpathian Paleogene Basin (CCPB) reflects an important role of relative sea level changes on a tectonically active basin margin. After the initial upper Lutetian/Bartonian transgression, the next regressive-transgressive cycle played a key role in a formation of the late Eocene fan delta facies associations in the southern Orava region of Northern Slovakia. Detailed sedimentary analysis allowed the separation of the following three facies associations which represent distinct depositional environments: alluvial fan (subaerial fan delta; Unit 1); subaqueous fan delta (Unit 2); and prodelta/slope and basin (Unit 3). The first stage of delta development is connected with eustatic sea level fall at the Bartonian/Priabonian boundary, accompanied by subaerial exposure, fluvial incision and deposition of alluvial fan sediments. Subaerial deposition was characterized by a variety of mass flow conglomerates with a red muddy matrix, interfingering with stream or sheetflood deposits. The next stage of the delta corresponds to high-amplitude transgression related to rapid tectonic subsidence along the CCPB margins during the Priabonian. The vertical arrangement of facies suggests retrograde delta development that shows rapid submergence of the subaerial parts and onlap of subaqueous mass flow conglomerates, often reworked by waves or wave-induced shallow-marine currents. Continuous deepening of the depositional environment during the late Priabonian/early Rupelian led to the relatively rapid superposition of prodelta/slope and basin facies associations by slowly accumulated hemipelagic deposis.
Źródło:
Geological Quarterly; 2012, 56, 1; 67-84
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Example of flow modelling characteristics in diesel engine nozzle
Autorzy:
Kolaric, D.
Kolaric, M.
Powiązania:
https://bibliotekanauki.pl/articles/197062.pdf
Data publikacji:
2016
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
diesel engine
mass flow
CFD
needle lif
injector
silnik wysokoprężny
przepływ masy
wtryskiwacz
Opis:
Modern transport is still based on vehicles powered by internal combustion engines. Due to stricter ecological requirements, the designers of engines are continually challenged to develop more environmentally friendly engines with the same power and performance. Unfortunately, there are not any significant novelties and innovations available at present which could significantly change the current direction of the development of this type of propulsion machines. That is why the existing ones should be continually developed and improved or optimized their performance. By optimizing, we tend to minimize fuel consumption and lower exhaust emissions in order to meet the norms defined by standards (i.e. Euro standards). Those propulsion engines are actually developed to such extent that our current thinking will not be able to change their basic functionality, but possible opportunities for improvement, especially the improvement of individual components, could be introduced. The latter is possible by computational fluid dynamics (CFD) which can relatively quickly and inexpensively produce calculations prior to prototyping and implementation of accurate measurements on the prototype. This is especially useful in early stages of development or at optimization of dimensional small parts of the object where the physical execution of measurements is impossible or very difficult. With advances of computational fluid dynamics, the studies on the nozzles and outlet channel injectors have been relieved. Recently, the observation and better understanding of the flow in nozzles at large pressure and high velocity is recently being possible. This is very important because the injection process, especially the dispersion of jet fuel, is crucial for the combustion process in the cylinder and consequently for the composition of exhaust gases. And finally, the chemical composition of the fuel has a strong impact on the formation of dangerous emissions, too. The research presents the influence of various volume mesh types on flow characteristics inside a fuel injector nozzle. Our work is based upon the creating of two meshes in the CFD software package. Each of them was used two times. First, a time-dependent mass flow rate was defined at the inlet region and pressure was defined at the outlet. The same mesh was later used to perform a simulation with a defined needle lift curve (and hereby the mesh movement) and inlet and outlet pressure. In next few steps we investigated which approach offered better results and would thus be most suitable for engineering usage.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2016, 90; 123-135
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pomiar objętości przepływu wody i masy substancji w niej zawartej i jego niepewność na przykładzie stawów rybnych
Measurement of water flow and mass of substances contained therein and its uncertainty based on fishponds example
Autorzy:
Kaca, E.
Powiązania:
https://bibliotekanauki.pl/articles/338204.pdf
Data publikacji:
2013
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
masa przepływu
masowe natężenie przepływu
metody obliczeń
niepewność pomiaru
objętościowe natężenie przepływu
objętość przepływu
flow mass
flow volume
mass flow intensity
methods of calculation
uncertainty of measurement
volumetric flow intensity
Opis:
Przedstawiono metody obliczania objętości przepływającej wody i masy substancji w niej zawartej na podstawie pomiarów objętościowego natężenia przepływu i wyników laboratoryjnych analiz stężeń. Zaproponowano wykonywanie tych obliczeń metodą prostokątów i - szczególnie wygodną, chociaż mniej dokładną - metodą trapezów. Błąd obliczeń tymi metodami jest wprost proporcjonalny do kwadratu okresu próbkowania. Dokładność obliczeń można poprawić, postępując zgodnie z zaproponowanym algorytmem. Zwrócono uwagę na konieczność charakteryzowania wyników obliczeń ich niepewnością, czyli przedziałem wartości, w jakim - z określonym prawdopodobieństwem, np. 95% - znajduje się wartość dokładna. W przypadku pomiarów objętości wody lub masy substancji w niej zawartych na podstawie co najmniej 15 pomiarów cząstkowych (pomiar objętościowego natężenia przepływu, a w przypadku obliczeń masy - dodatkowo stężenia substancji w wodzie) podstawą obliczeń niepewności mogą być odpowiednio: systematyczne niepewności standardowe pomiaru objętościowego natężenia przepływu i dodatkowo- systematyczne niepewności standardowe oznaczeń stężenia substancji w wodzie. W przypadku obliczeń objętości wody lub masy zawartej w niej substancji na podstawie mniejszej liczby pomiarów cząstkowych, podstawą obliczeń niepewności powinny być nie tylko systematyczne, lecz również przypadkowe niepewności standardowe pomiaru objętościowego natężenia przepływu i analiz stężeń substancji w wodzie. Stężenie substancji w wodzie i niepewność wyniku jego pomiaru powinny być określone przez chemiczne laboratoria akredytowane, które oprócz całkowitej niepewności wyniku analizy, powinny podawać jej składowe - niepewność przypadkową i systematyczną. W pracy podano przykłady obliczeń, w których wykorzystano pomiary prowadzone na jednym ze stawów w kompleksie Stawów Raszyńskich w Zakładzie Doświadczalnym Instytutu Technologiczno-Przyrodniczego.
The paper presents methods of calculating the volume of flowing water and mass of substances it contains based on measurements of water flow and laboratory analyses of concentrations. These calculations are proposed to be made with the method of rectangles and with especially convenient though less precise method of trapeziums. Error of calculations with these methods is proportional to the square of the sampling period. The accuracy may be improved by following the proposed algorithm. The need was underlined of characterising the results of calculations by their uncertainty i.e. by the range of values within which, at a certain probability e.g. 95%, falls the exact value. In case of measurements of water volume or mass of substances it contains based on at least 15 partial meas urements (measurement of volumetric flow and, for mass calculations, also the concentration of a substance in water) calculations of uncertainty may be based on systematic standard uncertainty of volumetric flow and systematic standard uncertainty of concentration measurements, respectively. When the number of partial measurements is smaller, than the uncertainty should be based not Orly on systematic but also on random standard uncertainties of volumetric flow measurements and analyses of concentrations. Concentrations of a substance in water and uncertainty of its measurement should be determined by accredited chemical laboratories, which, apart from the total uncertainty of analytical result should also give its components - random and systematic uncertainty. The paper gives examples of calculations which used measurements made in one of ponds in the complex Stawy Raszyńskie of the Experimental Farm, Institute of Technology and Life Sciences.
Źródło:
Woda-Środowisko-Obszary Wiejskie; 2013, 13, 1; 31-57
1642-8145
Pojawia się w:
Woda-Środowisko-Obszary Wiejskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Facies heterogeneity of a deep-sea depositional lobe complex : case study from the Słonne section of Skole Nappe, Polish Outer Carpathians
Autorzy:
Łapcik, P.
Powiązania:
https://bibliotekanauki.pl/articles/191784.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
deep-marine turbidites
depositional lobes
dynamic stratigraphy
facies analysis
mass flow deposits
Upper Cretaceous
Opis:
This article reports on the first detailed study of the Skole Nappe’s Ropianka Formation in the Słonne outcrop section along river San. Lithological and micropalaeontological similarities indicate that the sedimentary succession correlates with the formation’s Wiar Member of Campanian–late Maastrichtian age. The sedimentary succession, more than 140 m thick, is interpreted as a deep-marine complex of turbiditic depositional lobes and the study reveals its sedimentary anatomy. Six component facies of sediment gravity-flow deposits and their stratigraphic grouping into four facies associations are recognized, with these latter considered to represent deposits of the lobe axial zone, lateral flank zone and featheredge fringe zone, as well as an interlobe outer-fringe zone. Semi-quantitative characterization and comparison of facies associations gives insight into the succession’s sedimentary heterogeneity. Six depositional lobes superimposed upon one another are recognized in the stratigraphic succession, and their pattern of vertical stacking is interpreted in terms of dynamic stratigraphy on the basis of the upward succession of facies associations. The stratigraphic arrangement of facies associations is attributed to autogenic morphodynamic changes within the evolving depositional system, although it cannot be precluded that also eustatic and local tectonic forcing came into play. The case study sheds more light on the sedimentary environment, sediment sourcing system and spatial depositional pattern in the Late Cretaceous Skole Basin, where the aggrading seafloor apparently oscillated around the lysocline depth that could be mid-bathyal at that time.
Źródło:
Annales Societatis Geologorum Poloniae; 2017, 87, 4; 301-324
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical modeling of random diffusion flows in two-phase multilayered stochastically nonhomogeneous bodies
Autorzy:
Chaplya, Y.
Chernukha, O.
Davydok, A.
Powiązania:
https://bibliotekanauki.pl/articles/1938615.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska
Tematy:
diffusion process
mass flow
random structure
Neumann series
averaging over the ensemble of phase configurations
Opis:
An approach for studying stochastical diffusion flows of admixture particles in bodies of multiphase randomly nonhomogeneous structures is proposed, according to which initialboundary value problems of diffusion are formulated for flow functions and methods of solution construction are adapted for the formulated problems. By this approach the admixture diffusion flow is investigated in a two-phase multilayered strip for the uniform distribution of phases under conditions of constant flow on the upper surface and zero concentration of admixture on the lower surface. An integro-differential equation equivalent to the original initial-boundary value problem is constructed. Its solution is found in terms of the Neumann series. Calculation formulae are obtained for the diffusion flow averaged over the ensemble of phase configurations under both zero and constant nonzero initial concentrations. Software is developed, a dependence of averaged diffusion flows on the medium characteristics is studied and general regularities of this process are established.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2015, 19, 3; 297-320
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of usefulness of mass flow meter to the survey of SI engine cylinder filling in one working cycle
Autorzy:
Wołczyński, Z.
Powiązania:
https://bibliotekanauki.pl/articles/133140.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
SI engine
fill survey
mass flow meter
phase of fill survey
silnik ZI
miernik przepływu masy
Opis:
The article presents the technique of the usage of mass flow meter to the fill survey of a cylinder in the multi cylinder engine, in each working cycles. The result of correctness of the survey was grounded on the comparison of air masses: the one registered with the usage of the flow meter and the other one calculated on the basis of mixture parameters. The flow meter was located in the consolidated part of suction system in front of the throttle valve. Mixture parameters were determined on the basis of time of fuel injection and measured lzm factor of burnt mixture. The studies were carried out in the whole operating range of engine. Discrepancies between the measured and calculated values for 93% of all of the cycles fall within the ambit of ±3% of the actual value.
Źródło:
Combustion Engines; 2017, 56, 2; 187-192
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Piezoelectric valve for controlled pneumatic shock absorber
Autorzy:
Wiszowaty, R.
Biczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/31343107.pdf
Data publikacji:
2013
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
valve
piezovalve
actuation
piezoelectric actuator
APA
mass flow rates
landing gear
zawór
aktywator piezoelektryczny
masowe natężenie przepływu
Opis:
The work presents the idea of a valve equipped with an amplified piezoelectric actuator (APA® - Cedrat Technologies), designed for the use in an adaptive pneumatic shock absorber, which is considered as a landing gear of a small aircraft or unmanned aerial system. The idea of adaptation to impact conditions is based on the controlling the fluid flow between two chambers of the absorber. In the considered method flow intensity through the valve determines the absorber reaction. Utilization of the piezoelectric active element (APA) allows for fast acting of the system. A prototype of the valve and the absorber were created. The tests of the mass flow rate were performed.
Źródło:
IPPT Reports on Fundamental Technological Research; 2013, 4; 43-47
2299-3657
Pojawia się w:
IPPT Reports on Fundamental Technological Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of diffusion flows in two-phase multilayered stochastically nonhomogeneous bodies with non-uniform distribution of inclusions
Autorzy:
Chaplya, Y.
Chernukha, O.
Davydok, A.
Powiązania:
https://bibliotekanauki.pl/articles/1938616.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska
Tematy:
diffusion process
mass flow
random structure
Neumann series
averaging over the ensemble of phase configurations
beta distribution
Opis:
Admixture diffusion flows are investigated in two-phase randomly nonhomogeneous multilayered strips with non-uniform distributions of inclusions. Cases where the most probable disposition of layered inclusions is located near the body boundary on which the mass source acts in the neighborhood of another boundary and in the middle of the body are considered. The initial-boundary value problem is formulated for the function of random mass flow under conditions of a constant flow on the upper surface and zero concentration of the admixture on the lower surface. Calculation formulae are obtained for the diffusion flow averaged over the ensemble of phase configurations in the particular cases of beta-distribution at zero and nonzero initial concentrations. The dependences of the averaged admixture flows on medium characteristics are established. It is shown that if the admixture diffusion coefficient in inclusions is greater than in the matrix, consolidation of inclusions in the middle of the body leads to an increasing diffusion flow. Simulation of the averaged diffusion flows of the admixture in the multilayered strip is performed for different model variants of a probable disposition of phases in the body and their comparative analysis is carried out.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2015, 19, 3; 321-351
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
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