Investigation of the Effects of Intake Manifold Pressure on Performance and Combustion Characteristics in an HCCI Engine

Öz

Homogeneous charge compression ignition (HCCI) engines have significant advantages over spark ignition (SI) and compression ignition (CI) engines due to their high thermal efficiency and low NOx emissions. However, it is difficult to control the start of combustion. In this study, the effects of the intake manifold pressure on HCCI combustion were investigated experimentally at 373 K intake temperature in a four cylinders HCCI engine, which was transformed from the SI engine. It was observed that there was an advance in the start of combustion as the manifold pressure increased. It was also observed that the change in octane number had significant effects on the start of combustion. The highest thermal efficiency was recorded as 46.38% at 120 kPa manifold pressure using RON40 fuel. The increase in the volumetric efficiency that depends on the increase in manifold pressure provided an increase in maximum cylinder pressure and heat release.

Anahtar Kelimeler

• HCCI,low temperature combustion (LTC),combustion,engine performance

HCCI bir motorda emme manifoldu basıncının performans ve yanma karakteristiklerine etkilerinin incelenmesi

Öz

Homojen dolgulu sıkıştırma ile ateşlemeli (HCCI) motorların yüksek termik verimleri ve düşük NO_x emisyonları sebebiyle buji ile ateşlemeli (SI) ve sıkıştırma ile ateşlemeli (CI) motorlara göre önemli üstünlükleri bulunmaktadır. Ancak HCCI motorlarda yanma başlangıcının kontrol edilmesi oldukça zordur. Bu çalışmada, dört silindirli SI motordan dönüştürülmüş olan bir HCCI motoru kullanılmıştır. 373 K hava giriş sıcaklığı için, emme manifold basıncının HCCI yanma üzerine etkileri deneysel olarak incelenmiştir. Deney yakıtı olarak RON0, RON20 ve RON40 kullanılmıştır. Manifold basıncının artmasıyla yanma başlangıcının avansa alındığı gözlenmiştir. Ayrıca oktan sayısının değişiminin de yanma başlangıcı üzerine önemli etkileri olduğu gözlenmiştir. En yüksek indike termik verim RON40 yakıtı kullanımında, 120 kPa manifold basıncında %46,38 olarak kaydedilmiştir. Manifold basıncının artırılmasına bağlı olarak volümetrik verimin de artması maksimum silindir içi basınç ve ısı yayılımında artış sağlamıştır.

Anahtar Kelimeler

• HCCI,düşük sıcaklıkta yanma,yanma,motor performansı

Kaynakça

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