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BUJİ ATEŞLEMELİ HİDROJEN MOTORUNDA KARIŞIM ORANI VE ATEŞLEME AVANSININ MOTOR PERFORMANSINA VE ÇEVRİMLER ARASI FARKA ETKİSİNİN DENEYSEL ARAŞTIRILMASI

EXPERIMENTAL INVESTIGATION OF SPARK ADVANCE AND AIR-FUEL RATIO EFFECTS ON ENGINE PERFORMANCE AND CYCLIC VARIATION IN HYDROGEN FUELED SPARK IGNITION ENGINE

Journal Name:

  • Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

Publication Year:

  • 2011

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
In this study, effects of spark advance and air-fuel ratio on engine performance and cyclic variation in a hydrogen fueled spark ignition engine were investigated. A four stroke, single cylinder spark ignition engine having an L type cylinder head, was used. The engine was operated at constant speed of 1500 rpm, at two different fuel-air equivalence ratio and at various ignition timing conditions. In cylinder pressure data were used for prediction of engine performance parameters. Mean indicated pressure, indicated power, indicated torque, indicated efficiency, indicated specific fuel consumption and mass fraction burned values were calculated from the analysis of pressure data. The predicted results were showed that an increase in fuel-air equivalence ratio at lean conditions was resulted in a decrease in both volumetric and indicated efficiency and an increase of engine power as well as a decrease in cyclic variation. It was also found that the cyclic variations were originated mostly from flame development angle.
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Abstract (Original Language): 
Bu çalışmada, yakıt olarak hidrojeni kullanan buji ateşlemeli bir motorda ekivalans oranı ve ateşleme avansının motor performansına ve çevrimler arası farka etkisi araştırılmıştır. Çalışmada; tek silindirli, 4 zamanlı, L tipi silindir kafasına sahip buji ateşlemeli bir motor kullanılmıştır. Motor 1500 d/d sabit devirde, iki farklı yakıt-hava ekivalans oranında (φ = 0,3 ve φ = 0,6) ve farklı ateşleme avanslarında çalıştırılmıştır. Motor performans parametrelerinin tespitinde silindir içi basıncın krank açısına bağlı değişim verileri kullanılmıştır. Basınç verilerinin analizi neticesinde ortalama indike basınç, indike motor gücü, indike motor momenti, indike termik verim, indike özgül yakıt tüketimi ve yanmış kütle oranı değerleri hesaplanmıştır. Elde edilen sonuçlar, fakir karışım halinde yakıt-hava oranının artmasıyla, volümetrik verim ve indike termik verimdeki azalmaya rağmen, indike motor gücünün arttığı ve aynı zamanda çevrimler arası farkın azaldığını göstermiştir. Çevrimler arası farkın ise, büyük oranda alev gelişim açısından kaynaklandığı tespit edilmiştir.
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