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Metodologia szkolenia w zakresie symulacji procesów wymiany ładunku, wtrysku oraz spalania z wykorzystaniem pakietu AVL FIRE

Ćwikowski P., Kapusta Ł. J., Teodorczyk A.

Zeszyty Naukowe Wyższej Szkoły Informatyki

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2012

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Vol. 11, Nr 1

62-70

PL

W artykule zostały przedstawione doświadczenia oraz metodologia prowadzenia projektu szkoleniowego w zakresie symulacji numerycznych procesów przepływowych z wtryskiem paliwa ciekłego i spalaniem w silnikach tłokowych. Projekt noszący tytuł „Popularyzacja osiągnięć nauki polskiej i światowej w zakresie przyszłościowych trendów w procesach spalania w silnikach” składa się z dwóch części, wykładowej oraz ćwiczeniowej. Z uwagi na fakt, iż część ćwiczeniowa dotyczy zagadnień symulacji numerycznych przepływów ze spalaniem przy użyciu komercyjnego kodu CFD o nazwie AVL FIRE, w artykule skupiono się na tej części. Przedstawiono zakres oraz sposób doboru materiału dydaktycznego, z którym zapoznają się uczestnicy projektu. Oprócz tego zostały opisane rezultaty szkolenia w postaci przyrostu wiedzy uczestników szkolenia w zakresie zagadnień symulacji numerycznych.

EN

In this paper we present an overview of the experience and methodology in training project about numerical simulations of liquid fuel injection and combustion processes in piston IC engines. A project called "Popularization of polish and worlds science achievements in the field of future trends in combustion processes in piston IC engines" is composed of two parts, lectures and practical trainings. Second part is concerning in numerical simulations of flows and combustions with use of commercial CFD code as AVL Fire. Range and the way of choice of the didactic material is presented, besides results and achievements by the participants are discussed.

2

Influence of breakup models on simulation results of mixture formation and combustion in direct injection spark ignition engine

Jaworski P., Ćwikowski P., Teodorczyk A.

Archivum Combustionis

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2011

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Vol. 31 nr 1-2

43-54

EN

Nowadays the wide range of spark ignition (SI) engines with spray guided direct injection (SGDI) are in production. Spray development is playing a major role in advanced engine design with three-dimensional computational fluid dynamics (CFD). Nevertheless, there is still a need for improvement in CFD injection simulations because of high pressure injection. The high pressure influences the drop breakup, coalescence and evaporation, which are crucial for proper representation of simulated phenomenon. Computer codes, like FIRE, give a possibility to simulate the process of injection with various types of breakup models. In spite of the importance of atomization, the mechanisms of breakup are still not well understood. To obtain better understanding of breakup model s influence on combustion the simulations have been performed for the engine combustion chamber with inlet and outlet system and SGDI strategy. ECFM-3Z combustion model was used for ethanol fuel. Demonstration of the influence of different breakup regimes on the combustion processes is presented. Comparison was made for Wave, Tab (Taylor Analogy Breakup) and Reitz breakup models.

3

Comparison of breakup models in simulation of spray development in direct injection SI engine

Ćwikowski P., Jaworski P., Teodorczyk A.

Journal of KONES

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2010

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Vol. 17, No. 4

123-130

EN

Nowadays the wide range of spark ignition (SI) engines with spray guided direct injection (SGDI) is in production. Spray development is playing a major role in advanced engine design with three-dimensional computational fluid dynamics (CFD). Nevertheless still there is a need for improvement in CFD injection simulations because of the high pressure injection. The high pressure injection influences the drop breakup, coalescence and evaporation which are critical for proper representation of simulated phenomenon. Computer codes, like FIRE, give a possibility to simulate the process of injection with various types of breakup models. In spite of the importance of atomization, mechanisms of breakup are still not well understood. To obtain better understanding of breakup models simulations have been performed for the engine combustion chamber with inlet andoutlet system and SGDI strategy. For that the model was at first constructed and then imported to the Fire code. After meshing process the model has 2 million cells. The engine is not boosted and as fuel the ethanol is used. The calculations were performedfor 3500 rpm. The influence of different breakup regimes on the spray shape is presented in this study. Comparison is made for Wave, TAB (Taylor Analogy Breakup) and Reitz-Diwkar breakup models.