Numerical study of EGR effects on the combustion process parameters in HCCI engines

• Autorzy: Jamrozik A.

Warianty tytułu

PL

Badania numeryczne wpływu EGR na parametry procesu spalania w silniku HCCI

• Języki publikacji: EN

Abstrakty

EN

One of the main problems in the HCCI engine is the control and operation of the combustion process. At present the primary method of control of the combustion process in an HCCI engine system is EGR (Exhaust Gas Recirculation). The paper presents the results of three-dimensional modeling of combustion in a single-cylinder HCCI engine powered with DME fuel with a cooled external EGR. 3D modeling was performed in AVL Fire code. This work investigates the effects of EGR rate on the basic combustion parameters including start of the ignition (SOI), burn duration (BD), indicated pressure (p) and nitric oxide (NO) emissions. The modeling results show that increasing of the EGR rate in HCCI engine can delay the start of ignition (SOI) effectively and leads to a prolongation of the bum duration (BD). Delayed ignition in the HCCI engine through EGR, can provide similar performance (p) compared to conventional CI engine and at the same time pro vide a significant reduction in NO, emissions.

PL

Jednym z głównych problemów w silniku HCCI jest sterowanie i kontrola procesu spalania. Obecnie podstawową metodą kontroli spalania w silniku z systemem HCCI jest EGR (recyrkulacja spalin). W artykule przedstawiono wyniki trójwymiarowego modelowania procesu spalania w jednocylindrowym silniku HCCI zasilanym paliwem DME z chłodzonym zewnętrznym EGR. Modelowanie 3D przeprowadzono w programie AVL Fire. Niniejszy artykuł przedstawia badania wpływu stopnia EGR na podstawowe parametry procesu spalania, tj. chwilę początku zapłonu (SOI), czas trwania spalania (BD), ciśnienie indykowane (p) i emisję tlenku azotu (NO). Wyniki modelowania wskazują, że zwiększenie EGR w silniku HCC/ może skutecznie opóźnić rozpoczęcie zapłonu (SO/) i prowadzić do wydłużenia czasu trwania spalania (BD). Opóźniony zapłon w silniku HCCI przy użyciu EGR umożliwia uzyskanie osiągów (p) podobnych do osiągów konwencjonalnego silnika ZS i jednocześnie zapewnia znaczną redukcję emisji NO.

Słowa kluczowe

EN

homogenous charge compression ignition; exhaust gas recirculation (EGR); heat release rate

PL

zapłon samoczynny mieszanki jednorodnej; recyrkulacja spalin; szybkość wydzielania ciepła

• Wydawca: Polskie Towarzystwo Naukowe Silników Spalinowych
• Czasopismo: Silniki Spalinowe
• Rocznik: 2011
• Tom: R. 50, nr 4
• Strony: 50--61
• Opis fizyczny: Bibliogr. 31 poz.

Twórcy

autor

Jamrozik A.

• Faculty of Mechanical Engineering and Computer Science of Częstochowa University of Technology,

Bibliografia

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