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Tytuł:
Parameters of mode and characteristics of the process of broad layered facing of the cylindrical parts with the help of self-protective dust
Parametry rezhima i kharakteristiki processa shirokoslojnoj naplavki cilindrisheskikh detalejj samozashhitnojj poroskkovoj provolokoj
Autorzy:
Pakholyuk, A.
Skulskyi, V.
Hordyi, I.
Powiązania:
https://bibliotekanauki.pl/articles/793753.pdf
Data publikacji:
2011
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
broad layer
metal
facing
shaft
dust
melting
facing productivity
cylindrical shape
degradation
self-protective dust
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2011, 11
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
O podatności na wykwity współczesnych murów licowych
The susceptibility to efflorescence of contemporary facing walls
Autorzy:
Wesołowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/217764.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Konserwatorów Zabytków
Tematy:
wykwit
mur licowy
efflorescence
facing wall
Opis:
Niniejsza praca porusza temat estetyki murów licowych. Przeanalizowano obecnie obowiązujące polskie normy dotyczące doboru zapraw do elementów murowych. Na podstawie obserwacji przeprowadzonych na stanowiskach badawczych ustalono czynniki wpływające na powstawanie wykwitów.
The paper presents the aesthetic aspects of facing walls. The current Polish standard requirements were analyzed in relation to the selection of mortars for masonry units. The factors determining the development of efflorescence were established on the basis of observations made on test positions.
Źródło:
Wiadomości Konserwatorskie; 2009, 26; 115-124
0860-2395
2544-8870
Pojawia się w:
Wiadomości Konserwatorskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of the Hard-Facing Technology Application for Reparation of the Given Parts in Various Branches of Industry
Autorzy:
Lazić, V.
Arsić, D.
Mutavdžić, M.
Nikolić, R.
Meško, J.
Radović, L.
Ilić, N.
Powiązania:
https://bibliotekanauki.pl/articles/2064968.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
regeneration
hard-facing
friction
wear
machine parts
Opis:
This paper deals with the problem of defining the optimal procedure for reparation of the machine parts of large dimensions and complex shapes. The procedure consists of establishing the causes of the part's damages, definition of the reparation technology, with selection of its parameters and ways of execution. The reparation is done by hard-facing, with heat treatment that consists of preheating, additional heating and the post hard-facing tempering. The process parameters' selection includes choosing the right filler metal(s), ways and order of depositing the hard-faced layers, ways of reaching and maintaining the preheating temperatures, checking of the base metal's chemical composition and mechanical properties and deciding on the post-process heat and mechanical processing of the executed hard-facing. The executed reparation of the forging hammer's mallet, presented in details, serves as an example how the reparation can successfully serve as a substitute for procuring the new part and thus producing the savings both directly in lower costs and indirectly in shortening the down-time of the damaged part operation.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 279--285
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Never forget where you come from: Critical diversity literacy and structure-facing virtue among first-year students
Autorzy:
Conradie, Marthinus
Lasocka-Bełc, Olga
Powiązania:
https://bibliotekanauki.pl/articles/37257797.pdf
Data publikacji:
2024-06-25
Wydawca:
Akademia Pedagogiki Specjalnej. Language and Society Research Committee
Tematy:
critical diversity literacy
structure-facing virtue
racism
Opis:
This article investigates tensions that arose when a group of Learning Facilitators (LFs) and students collaboratively examined the socially constructed nature of racial identity. These discussions transpired in a South Africa Department of English, in an introductory module in postcolonial literature designed for first-year students. The core contribution of the article lies in conjoining critical diversity literacy (CDL) and structure-facing virtue to theorise this tension. It also produces suggestions for deepening the emancipatory potential of such discussions about identity and power in ways that are intended to be relevant to other settings in which comparable discussions are occurring between students and contractually appointed university teachers like LFs.
Źródło:
Language, Discourse & Society; 2024, 12, 1 (23); 73-92
2239-4192
Pojawia się w:
Language, Discourse & Society
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research methodology proposed for resilience of contemporary facing walls
Propozycja metodyki badań prognozująca trwałość współczesnych murów licowych
Autorzy:
Kaczmarek, A.
Wesołowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/402633.pdf
Data publikacji:
2016
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
efflorescence
facing wall
mortar
methodology
wykwit
przeciwległa ściana
moździerz
metodologia
Opis:
The article refers to proposition of research methodology for durability prognosis for facial walls. In present fast technology development there are new materials introduced to construction, and although their properties are known there is not necessary experience regarding their durability and resistance to influences of environmental impact for many years. In authors research there is possibility of migration of soluble compounds originating from the same ceramic material as well as from mortars in laboratory and field tests. After the analysis of European construction regulations the authors stated that they have not been prepared in such state to be a sufficient base for evaluation of durability of a facial wall. This element was left for designers decision, which results often in accidental choice of compound materials.
Artykuł dotyczy propozycji metodyki badawczej prognozowania trwałości murów licowych. Przy obecnym szybkim rozwoju technologii wprowadza się do budownictwa coraz to nowe materiały, których chociaż właściwości są znane, to nie ma jednak wystarczających doświadczeń co do ich trwałości i odporności na wpływy wieloletniego oddziaływania środowiska. W dotychczasowych badaniach autorki rozpatrzyły możliwość migracji rozpuszczalnych związków pochodzących z samego materiału ceramicznego jak również z zapraw w warunkach laboratoryjnych i poligonowych. Po analizie europejskich przepisów budowlanych stwierdziły, że nie zostały dotychczas przygotowane w takim stopniu, aby mogły być wystarczającą podstawą do oceny trwałości muru licowego. Ten element pozostawiono w gestii projektantów, w konsekwencji czego dobór materiałów składowych jest często dziełem przypadku.
Źródło:
Budownictwo i Inżynieria Środowiska; 2016, 7, 2; 81-86
2081-3279
Pojawia się w:
Budownictwo i Inżynieria Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
R&D on divertor plasma facing components at the Institute for Plasma Research
Autorzy:
Patil, Y.
Khirwadkar, S.
Belsare, S. M.
Swamy, R.
Khan, M. S.
Tripathi, S.
Bhope, K.
Powiązania:
https://bibliotekanauki.pl/articles/146770.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
divertor
plasma facing material
high heat fl ux test
transient IR thermography
Opis:
This paper is focused on various aspects of the development and testing of water cooled divertor PFCs. Divertor PFCs are mainly designed to absorb the heat and particle fluxes out flowing from the core plasma of fusion devices like ITER. The Divertor and First Wall Technology Development Division at the Institute for Plasma Research (IPR), India, is extensively working on development and testing of divertor plasma facing components (PFCs). Tungsten and graphite macro-brush type test mock-ups were produced using vacuum brazing furnace technique and tungsten monoblock type of test mock-ups were obtained by hot radial pressing (HRP) technique. Heat transfer performance of the developed test mock-ups was tested using high heat flux tests with different heat load conditions as well as the surface temperature monitoring using transient infrared thermography technique. Recently we have established the High Heat Flux Test Facility (HHFTF) at IPR with an electron gun EH300V (M/s Von Ardenne Anlagentechnik GmbH, Germany) having maximum power 200 kW. Two tungsten monoblock type test mock-ups were probed using HHFTF. Both of the test mock-ups successfully sustained 316 thermal cycles during high heat fl ux (HHF) tests. The test mock-ups were non- -destructively tested using infrared thermography before and after the HHF tests. In this note we describe the detailed procedure used for testing macro-brush and monoblock type test mock-ups using in-house transient infrared thermography set-up. An acceptance criteria limit was defined for small scale macro-brush type of mock-ups using DTrefmax value and the surface temperature measured during the HHF tests. It is concluded that the heat transfer behavior of a plasma facing component was checked by the HHF tests followed by transient IR thermography. The acceptance criteria DTrefmax limit for a graphite macro-brush mock-up was found to be ~3centi grade while for a tungsten macro-brush mock-up it was ~5centi grade.
Źródło:
Nukleonika; 2015, 60, 2; 285-288
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Overview of processing technologies for tungsten-steel composites and FGMs for fusion applications
Autorzy:
Matějíček, J.
Nevrlá, B.
Vilémová, M.
Boldyryeva, H.
Powiązania:
https://bibliotekanauki.pl/articles/148904.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
plasma-facing components
functionally graded materials (FGMs)
tungsten
steel
plasma spraying
powder metallurgy
Opis:
Tungsten is a prime candidate material for the plasma-facing components in future fusion devices, e.g. ITER and DEMO. Because of the harsh and complex loading conditions and the differences in material properties, joining of the tungsten armor to the underlying construction and/or cooling parts is a complicated issue. To alleviate the thermal stresses at the joint, a sharp interface may be replaced by a gradual one with a smoothly varying composition. In this paper, several techniques for the formation of tungsten-steel composites and graded layers are reviewed. These include plasma spraying, laser cladding, hot pressing and spark plasma sintering. Structure, composition and selected thermal and mechanical properties of representative layers produced by each of these techniques are presented. A summary of advantages and disadvantages of the techniques and an assessment of their suitability for the production of plasma-facing components is provided.
Źródło:
Nukleonika; 2015, 60, 2; 267-273
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MHD forced convection using ferrofluid over a backward facing step containing a finned cylinder
Autorzy:
Toumi, Meriem
Bouzit, Mohamed
Bouzit, Fayçal
Mokhefi, Abderrahim
Powiązania:
https://bibliotekanauki.pl/articles/2106228.pdf
Data publikacji:
2022
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
fin positions
forced convection
nanoparticles
heat transfer
finned cylinder
magnetohydrodynamic
backward facing step
Opis:
In this paper, a numerical study of forced convection on a backward facing step containing a single-finned fixed cylinder has been performed, using a ferrofluid and external magnetic field with different inclinations. The partial differential equations, which determine the conservation equations for mass, momentum and energy, were solved using the finite element scheme based on Galerkin’s method. The analysis of heat transfer characteristics by forced convection was made by taking different values of the Reynolds number (Re between 10 and 100), Hartmann number (Ha between 0 and 100), nanoparticles concentration (φ between 0 and 0.1) and magnetic field inclination (γ between 0° and 90°); also, several fin positions α [0°–180°] were taken in the counter clockwise direction by a step of 5. After analysing the results, we concluded that Hartmann number, nanoparticles concentration, Reynolds number and magnetic field angles have an influence on the heat transfer rate. However, the fin position on the cylinder has a big impact on the Nusselt number and therefore on heat transfer quality. The best position of the fin is at (α = 150°), which gives the best Nusselt number and therefore the best heat trans-fer, but the fin position at (α = 0°) remains an unfavourable case that gives the lowest Nusselt values.
Źródło:
Acta Mechanica et Automatica; 2022, 16, 1; 70--81
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Analysis of Turbulent Flow over a Backward-facing Step in an Open Channel
Autorzy:
Saleem, Bala Kawa M.
Mustafa, Andam
Kareem, Dalshad Ahmed
Yuce, Mehmet Ishak
Szydłowski, Micchał
Al-Ansari, Nadhir
Powiązania:
https://bibliotekanauki.pl/articles/31340451.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
open channel
backward-facing step
reattachment length
expansion ratio
Kɛ- model
Kω- model
Opis:
Computational examinations of the flow field in an open channel having a single Backward- -Facing Step (BFS) with a constant water depth of 1.5 m were performed. The effects of the expansion ratio, and the flow velocity along the reattachment length, were investigated by employing two different expansion ratios of 1.5 and 2, and eight various flow velocities of 0.5, 1, 2, 3, 4, 5, 7.5 and 10 m/sec in the Computational Fluid Dynamic (CFD) simulations. Commercially available CFD software, ANSYS FLUENT, was used for calculations. The simulation outcomes were verified using experimental results. Moreover, analyses were performed by using two equation turbulence closure models, K-ε family (standard, RNG and realizable), and K-ω family (Wilcox’s and SST K-ω). The analyses have revealed that the reattachment length increases with an increase in the expansion ratio, the flow velocity and the Reynolds number. The results obtained for two expansion rates and eight different flow velocities have shown insignificant differences between one turbulence closure model and the others. Furthermore, it was observed that both velocity and expansion ratios have an effect on the reattachment zone size.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2023, 70, 1; 49-69
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating the thermal and structural responses in hard-facing application with the GTAW process
Autorzy:
Savaş, Atilla
Powiązania:
https://bibliotekanauki.pl/articles/1839673.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
hard-facing
moving heat source
two-way coupling
gas tungsten arc welding (GTAW)
FEM
Opis:
The gas tungsten arc welding (GTAW) process is an excellent way of performing quality hard- -facing applications. The residual stresses and distortions are encountered in hard-facing. There are several methods to decrease residual stresses. Changing the welding pattern, changing thickness and preheating can be mentioned for this purpose. In this work, the influence of the welding pattern, plate thickness and preheating was investigated. The temperature distribution with the same welding conditions was used for validation of the numerical model. The total deformation in a 2mm plate was 15 times higher than in a 6mm plate with the same welding conditions.
Źródło:
Journal of Theoretical and Applied Mechanics; 2021, 59, 3; 343-353
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vlianie povysennogo urovna teplovoj zascity na dolgovecnost’ trehslojnyh sten s oblicovkoj iz kirpica v usloviah Rossijskoj Federacii
Durability of Three-Layer Walls with Brick Facing with High Level of Thermal Protection
Autorzy:
Umnakova, N. P.
Powiązania:
https://bibliotekanauki.pl/articles/2065102.pdf
Data publikacji:
2012
Wydawca:
Politechnika Częstochowska
Tematy:
brick facing
three-layer walls
heater
defects
temperature of external air
amplitude
temperature deformations
tension
Opis:
V dannoj stat’e proanalizirowana odna iz pricin razrusenia naruznyh sten s effektivnym uteplitelem tolscinoj 120-150 mm. i oblicovkoj iz kirpica v usloviah rascetnyh temperatur naruznogo vozduha nize minus 28˚C. Provedennyj sopostavitel’nyj analiz haraktera raspredelenia temperatur v tolsce trehslojnyh sten pokazal, cto polnoe promerzanie kripicnoj oblicovki pri tolscine uteplitela 120 mm proishodit pri temperature naruznogo vozduha minus 1˚C, v to vrema kak pri tolscine uteplitela 50 mm oblicovka promerzaet pri temperature naruznogo voduha minus 3˚C. Ucityvaa harakter raspredelenia srednih temperatur po mesacam, v tom cisle v osennij period, mozno predpolozit’, cto pri sredniej temperature noabra minus 2,2 ˚C veroatnost’ promerzania kripicnoj oblicovki pri bol’sej tolscine uteplitela znacitel’no vyse, cem pro 50-ti millimetrovom uteplitele. Analiz srednemesacnyh temperaur naruznogo vozduha i amplitudy ih kolebanij pozvolil ustanovit’, cto polnoe promerzanie naruznoj kripicnoj oblicovki pri tolscine uteplitela 120 mm proishodit v srednem v tecenie 6 mesacev, v to vrema kak pri maloj tolscine uteplitela polnoe promerzanie oblicovki mozet proishodit’ lis’ v tecenie 4 mesacev. Bol’saa tolscina teploizolacionnogo sloa privodit k tomu, cto temperaturnye deformacii i naprazenie v tolsce naruznogo sloa kirpica okazyvautsa bol’simi. Vse eti faktory v komplekse sposobstvuut uskorennomu razruseniu kirpicnoj oblicovki sloistyh sten.
This article examines possible reasons for three-layered external walls fracturing with efficient insulation of 120-150 mm thick. Exterior coating of these walls is made of brick. Comparative analysis of temperature distribution inside the walls showed that the full-depth freezing of the wall with insulation of 120 mm thick takes place when exterior temperature is under - 1˚C. However, the same effect on the walls with insulation of 50 mm thick occurs under exterior temperature of -3˚C. Taking into account the average monthly temperature pattern, particularly in autumn, it can be considered that under the average November temperature of -2,2˚C the chance of full-depth wall freezing with thicker insulation is higher than for the wall with only 50 mm of insulation. Analysis of the monthly average outdoor air temperatures and the ranges of their oscillations revealed that full-depth wall freezing with insulation of 120 mm thick takes place for 6 months, and for the same wall but with thinner insulation, that effect occurs only for 4 months. These calculations show that the thicker the insulation is, the bigger the temperature deformations and temperature stresses in the exterior brick layer are. All of it together speeds up brick veneer fracturing in the three-layered walls.
Źródło:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2012, 2 (10); 111--116
2299-8535
2544-963X
Pojawia się w:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Revitalization of the damaged machine parts by hard facing as a way of saving funds
Autorzy:
Lazic, V.
Arsic, D.
Nikolic, R.
Mutavzic, M.
Hadzima, B.
Powiązania:
https://bibliotekanauki.pl/articles/111734.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
revitalization technology
hard facing
costs
savings
profitability
loader's bucket teeth
technologia rewitalizacji
napawanie
rentowność
ładowarka
Opis:
The objective of the research, presented in this paper, was to demonstrate the superiority of the hard facing as the revitalization technology of various damaged machine parts. The analysis of the two different revitalization methods of the damaged machine parts is presented – the replacement of the damaged part by the new – spare part and reparation by hard facing. The comparison is done on the example of hard facing and replacing of damaged loader's teeth. The paper presents a method for calculating costs of the two revitalization technologies based on their profitability and their comparison. That method could be applied for similar calculations for any machine part, with smallest or no adjustments. The paper presents a verification of advantage of applying the hard facing as the machine parts reparatory technology with respect to the other revitalization technology. The savings realized by application of hard facing reparation of the loader's teeth reach 73.5 % for one set of teeth and 82.40per annum of the costs for purchasing the new spare parts. The analysis was conducted under an assumption that organization of the maintenance function is at the exceptionally high level so that the purchasing of the new part/repairing of the damaged one is always done in time. This idealized approach was adopted since in that way one obtains the least economic effects of the reparatory technology application with respect to replacing the part with the spare one. In any other case the economic effects would be significantly higher, namely even more positive in favor of the hard facing revitalization technology.
Źródło:
Production Engineering Archives; 2016, 12, 3; 9-13
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polska polityka regionalna wobec zróżnicowań polskiej przestrzeni
Poland’s Regional Policy Facing the Differentiation of the Polish Space
Autorzy:
Gorzelak, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/414179.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Warszawski. Instytut Ameryk i Europy. Centrum Europejskich Studiów Regionalnych i Lokalnych (EUROREG)
Tematy:
polityka regionalna
zróżnicowania przestrzenne
procesy długiego trwania
regional policy Facing
regional differentiation
long duration processes
Opis:
Artykuł przedstawia regionalne zróżnicowania Polski w wielu wymiarach i aspektach: gospodarczym, społecznym, politycznym. Poszczególne zjawiska układają się w przestrzeni Polski w zasadzie w podobny sposób, co prowadzi do potwierdzenia znanych tez o istnieniu silnej współzależności wielu zjawisk w procesie rozwoju. Historyczne uwarunkowania zróżnicowań przestrzeni po raz kolejny wskazują także na to, iż terytorialne różnice w Polsce są produktem "długiego trwania". Obydwie te charakterystyki zróżnicowań ich kompleksowość i historyczne uwarunkowania każą z ostrożnością podchodzić do możliwych efektów polityki regionalnej, która może obiektywnie istniejącą rzeczywistość zmienić tylko stopniowo i w niewielkim zakresie. W zakończeniu artykułu są sformułowane pewne zalecenia pod adresem tej polityki.
The article presents the regional differentiation of several phenomena economic, social, political of the Polish space. It is striking to notice that the patterns of these differentiations are very similar, which proves a well-known thesis of mutual interrelationships that exist between several dimensions of development. The historical underpinnings of these differentiations prove once again that they are the product of "long duration". Both these characteristics the similarity of differentiations and their historical roots lead to a conclusion that the regional policy should assume a modest attitude, since it can change the objective reality only gradually and to some extent. The article ends with some extent. The article ends with some suggestions for this policy.
Źródło:
Studia Regionalne i Lokalne; 2004, 4(18); 37-72
1509-4995
Pojawia się w:
Studia Regionalne i Lokalne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reparation of damaged forging dies by hard facing (HF) technology
Autorzy:
Lazic, V.
Arsic, D.
Nikolic, R. R.
Aleksandrovic, S.
Milosavljevic, D.
Djordjevic, M.
Cukic, R.
Powiązania:
https://bibliotekanauki.pl/articles/111606.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
forging dies
hard facing (HF)
filler metals (FM)
hardness
microstructure
matryce kuźnicze
napawanie
spoiwa
twardość
mikrostruktura
Opis:
The forging dies are in exploitation exposed to elevated temperatures and variable impact loads, both compressive and shear. Steels for manufacturing of these tools must endure those loads while maintaining mechanical properties and being resistant to wear and thermal fatigue. For those reasons, the alloyed steels are used for making the forging dies, though they have less weldability, because alloying increases proneness to hardening. Any reparatory hard facing (HF) of the damaged dies would require the specially adjusted technology to the particular piece. In this paper reparatory hard facing of dies used for forging pieces in the automobile industry is considered. Prior to reparatory hard facing of the real tools, numerous experimental hard facings on models were performed. All the model hard facings were done on the same steels which were used for production of the real forging dies. To define the optimal hard facing technology one needs to derive the optimal combination of the adequate heat treatment(s), to select the proper filler metals and the welding procedure. The established optimal HF technology was applied to real forging dies whose service life was further monitored in conditions of exploitation.
Źródło:
Production Engineering Archives; 2015, 6, 1; 26-29
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical study of laminar non-premixed biogas-air flames behind backward facing steps
Autorzy:
Harish, Alagani
Raghavan, Vasudevan
Powiązania:
https://bibliotekanauki.pl/articles/2172775.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
biogas
non-premixed flames
backward facing step
flame stability
detailed kinetics
biogaz
płomienie
stabilność płomienia
kinetyka
Opis:
Biogas, a renewable fuel, has low operational stability range in burners due to its inherent carbon-dioxide content. In cross-flow configuration, biogas is injected from a horizontal injector and air is supplied in an orthogonal direction to the fuel flow. To increase the stable operating regime, backward facing steps are used. Systematic numerical simulations of these flames are reported here. The comprehensive numer- ical model incorporates a chemical kinetic mechanism having 25 species and 121 elementary reactions, multicomponent diffusion, variable thermo-physical properties, and optically thin approximation based volumetric radiation model. The model is able to predict different stable flame types formed behind the step under different air and fuel flow rates, comparable to experimental predictions. Predicted flow, species, and temperature fields in the flames within the stable operating regime, revealing their anchoring positions relative to the rear face of the backward facing step, which are difficult to be measured experimentally, have been presented in detail. Resultant flow field behind a backward facing step under chemically reactive condition is compared against the flow fields under isothermal and non-reactive conditions to reveal the sig- nificant change the chemical reaction produces. Effects of step height and step location relative to the fuel injector are also presented.
Źródło:
Archive of Mechanical Engineering; 2022, LXIX, 2; 221--244
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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