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    Wyświetlanie 1-10 z 10
    Tytuł:
    Experimental study on injection characteristics of diesel-bioethanol fuel blends
    Autorzy:
    Slavinskas, S.
    Mickevičius, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/132882.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    diesel fuel
    ethanol-diesel blend
    common rail injection system
    injection rate
    discharge coefficient
    silnik Diesla
    układ wtryskowy Common Rail
    Opis:
    This article presents the test results of injection processes of diesel-bioethanol fuel blends on a high pressure common rail injection system. The injection characteristics were analyzed using the injection rate measuring instrumentation. The injection rate, cycle injection quantity, injection delay and injection duration were analyzed across a range of injection pressure and injection energizing time. As the results show, the peak injection rate and delay of diesel-ethanol blends are lower compared to diesel fuel. The injection duration and discharge coefficients of diesel-ethanol blends were lower than those of diesel fuel. It was observed that fuel density and fuel viscosity have significant influence on the injection characteristics.
    Źródło:
    Combustion Engines; 2015, 54, 2; 28-32
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of biodiesel on the development of split injection characteristics
    Autorzy:
    Slavinskas, Stasys
    Labeckas, Gvidonas
    Mickevičius, Tomas
    Powiązania:
    https://bibliotekanauki.pl/articles/133371.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    split injection
    injection rate
    common rail injection system
    diesel fuel
    biodiesel fuel
    wtrysk dzielony
    dawka wtrysku
    układ wtryskowy Common Rail
    olej napędowy
    biodiesel
    Opis:
    The paper presents the experimental test results of a common rail injection system operating with biodiesel and the diesel fuel. The three fuel split injection strategies were implemented to investigate the effects made by biodiesel and a fossil diesel fuel on the history of injector inlet pressure and the injection rate. In addition, the three intervals between split injections and the different injection pressures were used to obtain more information about the studied subjects. The obtained results showed that the peak mass injection rates of the main injection phase were slightly higher when using biodiesel than the respective values measured with the normal diesel fuel. Because the first injection phase activated the fuel pressure fluctuations along the high-pressure line and in front of the injector, the time-span between injections has an impact on the injector inlet pressure and thus the fuel injection rate during the second injection phase. Since the nozzle closes little later for biodiesel, the injector inlet pressure also occurred latter in the cycle.
    Źródło:
    Combustion Engines; 2019, 58, 2; 103-107
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculated injection times of divided fuel dose in a compression ignition engine
    Autorzy:
    Knefel, T.
    Nowakowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/133694.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    diesel engine
    common rail injection system
    indicator of injection
    fuel injection rate
    injection time
    silnik spalinowy
    układ wtryskowy Common Rail
    indykator dawki wtrysku
    przebieg wtrysku
    czas wtrysku
    Opis:
    This study presents analyses concerning control processes of injection times of divided dose of fuel, starting from setting of injection time in controller up to moment of execution in compression ignition engine. Multiple injection doses were analyzed taking into consideration both sums of individual portions of doses as well as gaps between the doses. Studies were performed for various configurations of the doses, with different values of injection times and gaps between the injections. Measurements were performed for three measuring groups containing single-, two-, and five-portion doses. At constant values of time in a given group it have been applied variable injection pressures. The most important factors determining division of fuel dose were discussed.
    Źródło:
    Combustion Engines; 2017, 56, 2; 113-119
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tempo iniekcji hydrostatycznych do drewna dębu szypułkowego (Quercus robur L.) w zależności od grubości i wysokości drzewa oraz miąższości strzały w korze
    Autorzy:
    Zarzyński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1019703.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    cechy dendrometryczne
    iniekcja hydrostatyczna
    wysokosc
    Quercus robur
    grubosc
    lesnictwo
    dab szypulkowy
    miazszosc strzaly w korze
    drzewa lesne
    hydrostatic injection
    injection rate
    pendiculate oak
    Opis:
    Hydrostatic injection of chemicals applied directly into the wood of live trees is the method used in treating and preventing many of diverse tree diseases. The usefulness of this method was proved as a result of the previously performed experiments with young trees. However, still an open question remains how much effective the treatment applied to older trees of greater dimensions can be. The author of the paper attempts to provide answer to this question.
    Źródło:
    Sylwan; 2005, 149, 07; 51-56
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on fuel injector with Hydraulic Amplifier (HADI) on the example of Mercedes-Benz Actros vehicle with OM 471.9 engine
    Autorzy:
    Mórawski, Ł
    Trawiński, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/242432.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    diesel engine
    common rail systems
    fuel injectors
    injection rate modulation
    boot injection
    silnik Diesla
    system common rail
    wtryskiwacze paliwa
    modulacja szybkości wtrysku
    rozruch silnika
    Opis:
    One of the recent trends in heavy-duty engines has been the introduction of common rail injector with hydraulic amplifier (HADI − Hydraulically Amplified Diesel Injector) capable of considerable fuel pressure injection increase in reference to fuel pressure prevailing in rail of common rail fuel system. An example of a solution of this type of injectors is the two-valve CRIN4 injectors manufactured by Bosch. They allow the control of the fuel flow rate during injection process and therefore have an impact on the combustion process. In this article, advantages related to their use are described, which allow the engines with such injectors to meet the limits of the admissible content of toxic compounds in the exhaust gases defined in the EURO VI standard. An experimental study of the operation of the Bosch IV generation common rail system was performed on the Mercedes-Benz Actros. During measurement engine load, engine speed, waveforms (electric currents) controlling operation of the selected injectors, fuel pressure in the rail and the control current of high pressure pump control valve (metering unit) were registered. Interpretations of recorded waveforms were made, indicating the areas of application of the various modes operation. The use of CRIN4 injectors for the rapid reduction of fuel pressure in rail was observed, which supports the metering unit (ZME) for pressure control.
    Źródło:
    Journal of KONES; 2018, 25, 1; 307-316
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of injection timing on the combustion characteristics for the heterogeneous combustion field using impinging injection
    Autorzy:
    Kawakami, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/244824.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    impinging injection
    split injection
    heat release rate
    Opis:
    It is very important to achieve the low particulate and low emissions under high power operation conditions in practical industrial engine and turbine combustion. Several techniques for reducing the emissions have been proposed and a large amount of experimental data has been published. It is well known that the combustion field in practical industrial diesel engine are strongly influenced by the behaviour of injection, distribution of droplets and the premixed ratio of the combustion chamber. As the first step of this study, experiments have been carried out to examine the combustion characteristics of heterogeneous combustion field by using impinging injection and Split injection in a closed chamber. The combustion chamber is equipped with pintle type injection nozzles on each of the opposite walls along the length of the bomb. In this study, we call it “impinging injection” when the injection is performed at same time by two nozzles facing each other and “split injection” when the impinging injection is performed at two different timing. The main conclusions are as follows: 1) the most suitable conditions of injection timing exists for improving the maximum burning pressure and total burning time by using impinging injection; 2) the flame speed can be possible to control by using impinging injection timing from the ignition; 3) the heat release rate for Split injection is larger than that of standard impinging injection.
    Źródło:
    Journal of KONES; 2018, 25, 3; 283-288
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study on the flowback of a carboxymethyl hydroxypropyl guar gum fracturing fluid with good temperature resistance
    Autorzy:
    Dai, Xiaodong
    Li, Lei
    Zhang, Xin
    Cheng, Zhensong
    Powiązania:
    https://bibliotekanauki.pl/articles/2200830.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    fracturing fluid
    backflow rate
    injection pressure
    displacement direction
    proppant wettability
    Opis:
    For unconventional oil and gas reservoirs such as shale oil and gas as well as tight oil and gas, hydraulic fracturing generally enhances oil recovery. However, the flowback rate of the residual fracturing fluid is low. The residual fracturing fluid in the fracture or the rock ma- trix can reduce relative permeability of oil and gas, and the production rate will decrease. Therefore, it is necessary to study the factors that affect the flowback rate of the fracturing fluid. Most previous studies used the slot model, and viscous and capillary forces explain stable discharge in porous media. The conclusions were only a primarily qualitative analysis. The factors from experimental studies were not comprehensive, and they did not consider the influence of gravity. There are few studies on unstable drainage in porous media un- der different displacement directions. This paper presents a carboxymethyl hydroxypropyl guar gum fracturing fluid with good temperature resistance, and a fracturing fluid flowback experiment is carried on. The effects of the displacement direction, injection pressure, inter- facial tension, fracturing fluid viscosity, and proppant wettability on the flowback rate are analyzed. The research results can provide formulation of the on-site construction scheme.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2022, 60, 4; 733--744
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Static Model Study on the Characteristics of Coke Oven Gas Dome Injection in COREX Melter Gasifier
    Autorzy:
    Kou, Mingyin
    Zhou, Heng
    Wu, Shengli
    Shen, Yansong
    Powiązania:
    https://bibliotekanauki.pl/articles/356304.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    coke oven gas injection
    COREX melter gasifier
    fuel rate
    static model
    Opis:
    Coke oven gas (COG) dome injection in COREX melter gasifier is recognized as one of effective method to reduce the amount of solid fuel used for gasification. In this work, a static model was developed to study the characteristics when COG is injected from dome. The critical bosh gas and critical fuel rate in COREX melter gasifier under different melting rate and coke rate were discussed. The amount of COG injection from dome under the critical fuel rates was studied. The results shows that when the heat of bosh gas reaching the critical value, the decrement of fuel rate decreases with the increase of melting rate and increases with the increase of coke rate. Under the critical fuel rate, the total volume of COG increases with the increase of melting rate and coke rate. After the COG injection, the amount and reduction capacity of the generator gas can meet the needs of reduction in shaft furnace. The findings of this work can be used as a theoretical basis to guide plant operations for COG injection.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 275-281
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved calculations for bottom hole injection pressure versus depth while gas injection for pressure maintenance of Tengiz field
    Udoskonalone metody obliczania zależności ciśnienia na dnie otworu iniekcyjnego od głębokości w trakcie zatłaczania gazu w celu utrzymania ciśnienia na złożu Tengiz
    Autorzy:
    Abdrakhmanova, D.
    Jiyembayeva, K.
    Zhapbasbayev, U. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/300135.pdf
    Data publikacji:
    2010
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    złoże Tengiz
    zatłaczanie
    ciśnienie
    otwory
    temperatura
    prędkość zatłaczania
    Tengiz field
    injection
    pressure
    wells
    temperature
    rate
    Opis:
    The aim of this project is to calculate bottom hole injection pressure versus depth while gas injection for pressure maintenance of Tengiz field in order to determine injectivity of various reservoir layers (Bash, Serp, Okskey).The mail objective is to develop correlations for the 7 active injection wells to predict bottom hole injection pressures at the end of the tubing, middle of Bash, middle of Serp, and middle of Oksky. Each well will have its own individual correlation. These correlations based on factors such as depth, temperature, pressure and rate. As a result, there are some deviations of predicted pressure versus measured pressure. I think, the basic reason is that we have different approximate gas injection rates. So we can't exactly determine its volume.
    Celem projektu jest obliczenie ciśnienia zatłaczania na dnie otworu w funkcji głębokości w trakcie zatłaczania gazu w celu utrzymania ciśnienia w złożu Tengiz oraz określenie zdolności iniekcyjnych poszczególnych warstw złoża (Bash, Serp, Okskey). Podstawowym celem jest określenie korelacji dla siedmiu istniejących otworów iniekcyjnych oraz oszacowanie ciśnienia zatłaczania na dnie otworu na końcu rur (środkowy Bash, środkowy Serp, środkowy Okskey). Dla każdego otworu wylicza się indywidualną korelację na podstawie wartości głębokości, temperatury, ciśnienia i wydatku. W wyniku tego powstają odchylenia przewidywanej wartości ciśnienia w funkcji zmierzonego ciśnienia. W opinii autorów podstawowym powodem tego są różne szacowane prędkości zatłaczania, w zawiązku z czym trudne jest precyzyjne oszacowanie zatłaczanych objętości.
    Źródło:
    Wiertnictwo, Nafta, Gaz; 2010, 27, 1--2; 43-47
    1507-0042
    Pojawia się w:
    Wiertnictwo, Nafta, Gaz
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CFD modelling of combustion in HCCI engine using avl fire software
    Autorzy:
    Jamrozik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/410680.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    spalanie
    zapłon
    czas zapłonu
    homogenous charge compression ignition
    exhaust gas recirculation (EGR)
    heat release rate
    start of the ignition
    burn duration
    injection timing
    conventional compression ignition engine
    indicated pressure
    nitric oxide
    Opis:
    HCCI (Homogenous Charge Compression Ignition) combustion system is now one of the most promising solutions used in piston engines. The paper presents the results of three-dimensional modeling of combustion in the single cylinder HCCI engine powered with Diesel fuel. 3D modeling was performed in AVL Fire code. The basic combustion parameters including start of the ignition (SOI), burn duration (BD), indicated pressure (pi) and nitric oxide (NO) and soot (Soot) emissions were analyzed. The modeling results show that combustion process in HCCI engine compared to a conventional engine with compression ignition is characterized by an earlier ignition (SOI) and shorter burn duration (BD). The impossibility of controlling HCCI combustion process leads to deterioration of engine performance and increased emissions of harmful exhaust gas components. Calculations showed that for the same equivalence ratio of burn mixture, uncontrolled HCCI combustion compared to a controlled combustion in engine with fuel injection operated is characterized by higher NO emission and reduced Soot emission.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2012, 1, 1; 51-55
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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