Hamit SOLMAZ, Emre YILMAZ, Çağatay NACAK, Serdar HALİS, H. Serdar YÜCESU

INVESTIGATION OF THE EFFECTS OF OCTANE NUMBER ON COMBUSTION CHARACTERISTICS AND ENGINE PERFORMANCE IN A HCCI ENGINE

In this study, the effects of reference fuels with different research octane numbers (RON0, RON20 and RON40) on engine performance were investigated at 40 °C intake air temperature and full load in a four cylinders HCCI engine. The operating range for the HCCI engine has been determined and the brake specific fuel consumption maps for each fuel have been created. Combustion characteristics were investigated at a constant engine speed of 1000 rpm. The heat release rate and in-cylinder pressure lambda values of λ=2.15 were obtained for the engine operating in natural-aspirated mode. As the number of octane increases, the engine load increases but the operating range decreases. The lowest BSFC values were obtained at 238.7 g/kWh for RON0, 251.3 g/kWh for RON20 and 276.6 g/kWh for RON40. It was observed that there was a delay in the start of combustion as the number of octane increased. The best CA50 value was obtained 6 °CA from aTDC with RON40 because of the slower burning than RON0 and RON20.

HCCI BİR MOTORDA OKTAN SAYISININ YANMA KARAKTERİSTİKLERİ VE MOTOR PERFORMANSI ÜZERİNE ETKİLERİNİN İNCELENMESİ

Bu çalışmada, HCCI modundaki dört silindirli bir motorda 40 °C giriş hava sıcaklığında ve tam gaz kelebeği açıklığında farklı araştırma oktan sayısına (RON0, RON20 ve RON40) sahip referans yakıtların motor performansı ve yanma karakteristikleri üzerindeki etkileri incelenmiştir. HCCI motor için çalışma aralığı belirlenmiş ve her bir yakıt için fren özgül yakıt tüketimi (FÖYT) haritaları oluşturulmuştur. Yanma karakteristikleri 1000 rpm sabit motor hızında incelenmiştir. Doğal emişli olarak çalıştırılan motorda λ=2.15 değerinde ısı yayılım oranı ve silindir içi basınç değerleri analiz edilmiştir. Oktan sayısı arttıkça motor yükünün de arttığı ancak çalışma aralığının azaldığı görülmüştür. En düşük özgül yakıt tüketimi değerleri RON0 için 238.7 g/kWh, RON20 için 251.3 g/kWh ve RON40 için 276.6 g/kWh olarak elde edilmiştir. Oktan sayısının artmasıyla yanma başlangıcında gecikme olduğu gözlenmiştir. En iyi CA50 değeri, RON0 ve RON20' ye göre daha yavaş yanma olması nedeniyle RON40 ile üst ölü noktadan 6 °KA sonra elde edilmiştir.

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