Temat: spray combustion - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Impact of subgrid modelling and numerical method on autoignition simulation of two-phase flow
Autorzy:: Stempka, J.
Powiązania:: https://bibliotekanauki.pl/articles/240563.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: discretization schemes
convective term
WENO
TVD
spray combustion
człon konwekcyjny
spalanie
Opis:: The present work focuses on analyses of the autoignition delay time predicted by the large eddy simulation (LES) method by applying different subgrid scales (SGS) models and two different discretization schemes. The analysed flow configuration is a two-phase chemically reacting turbulent flow with monodispersed evaporating fuel droplets. The impact of numerical procedure is investigated in a 3D flow domain with a temporally evolving mixing layer that constituted between the streams of fuel and oxidizer that moved in opposite directions. The upper stream of cold gas carries a dispersed fuel spray (ethanol at 300 K). The lower stream is a hot air at 1000 K. Three commonly used in LES, SGS models are investigated, namely: classical Smagorinsky model, model proposed by Vreman and the σ-model proposed by Nicoud. Additionally, the impact of two discretization schemes, i.e., total variation diminishing (TVD) and weighted essentially nonoscillatory (WENO) is analysed. The analysis shows that SGS model and discretization scheme can play a crucial role in the predictions of the autoignition time. It is observed that for TVD scheme the impact of SGS model is rather small. On the contrary, when the WENO scheme is applied the results are much more dependent on the SGS model.
Źródło:: Archives of Thermodynamics; 2018, 39, 2; 55-72
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Laser research of fuel atomization and combustion processes in the aspect of exhaust gases emission
Autorzy:: Jankowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/243315.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
fuel preparation
combustion processes
fuel spray
ecology
Opis:: The fuel injection phenomena belongs to the most essential processes, which are object of many experimental and theoretical works, indispensable for development of contemporary internal-combustion engines, both the spark and compression ignition. The direct injection of fotel to the engine combustion chamber belongs to most advanced solutions and must realize at least two or even more different strategies of engine performance. Article presents the various research methods of the fuel atomization processes, being concentrated on laser methods, from which deserves on the emphasis the Particle Image Velocimetry (PIV) system, the Laser Doppler Velocimeter (LDV) system and Phase Doppler Particle Analyzer (PDPA) system. Article presents theoretical analysis relating the atomized fuel stream. The results of research based on the laser research equipment are also submitted in the article. Moreover presented are the results ofresearch of the combustion process in the fixed volume chamber, where essentially two different strategies of the combustion process of homogenous and heterogeneous load were realized. The properly shaped fuel stream permits on obtainment of repeatable ignition and combustion in the wide range of the mixture variance. The essential meaning has the fuel stream disintegration, which influences advantageously on the level of the toxic exhaust elements emission, particularly on the hydrocarbon emission level because of the ignition dropout elimination and on the level of the nitrogen oxides emission because of short sojourn time of the fuel droplets in the combustion zone.
Źródło:: Journal of KONES; 2008, 15, 1; 119-126
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A review of the design and control using computational fluid dynamics of gasoline direct injection engines
Autorzy:: Ali, Mohammed Qasim
Mohamad, Barhm
Powiązania:: https://bibliotekanauki.pl/articles/2096202.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: computational fluid dynamics
engine emissions
optimization
gasoline direct injection
combustion modelling
injector spray pattern
numeryczna mechanika płynów
optymalizacja
bezpośredni wtrysk benzyny
Opis:: This paper explores the role of the computational fluid dynamics (CFD) modeling technique in the design, regulation, and production of the gasoline direct injection (GDI) engine combustion system through literature reviews. It begins with a brief analysis of injector technologies and the effect of spray characteristics on the optimization of the combustion system. The key challenges of optimizing a homogeneous-charge GDI combustion system are the enhancement of volumetric performance and homogeneity of fuel-air mixing with reduced wetting of surface fuel and the improvement of power output. Most of the calculations focused on dynamic mesh strategy to manage moving geometry varied from case to case. The techniques of the methods varied. During the opening event of a GDI gasoline-injector for automotive applications, the findings of the literature indicate the primary fuel atomization.
Źródło:: Diagnostyka; 2022, 23, 3; art. no. 2022306
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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