RCCI BİR MOTORDA ENJEKSİYON ZAMANLAMASI VE LAMDANIN YANMA VE PERFORMANS KARAKTERİSTİKLERİ ÜZERİNDEKİ ETKİLERİNİN DENEYSEL İNCELENMESİ

Ahmet Uyumaz, Hamit Solmaz
999 358

Öz


Bu çalışmada, dört zamanlı, dört silindirli, direkt püskürtmeli reaktif kontrollü sıkıştırma ile ateşlemeli (RCCI) bir motorda enjeksiyon zamanlaması ve lamdanın yanma ve performans karakteristikleri üzerindeki etkileri deneysel olarak incelenmiştir. Bu amaçla direkt püskürtmeli RCCI motorda porttan izooktan yakıtı, direkt silindir içerisine n-heptan yakıtı ÜÖN’dan 100, 80, 60, 50, 40, 30, 20 °KA önce püskürtülerek RCCI yanması üzerindeki etkileri araştırılmıştır. Tam yükte, 1000 d/d’da, 40 °C emme havası giriş sıcaklığında, sabit supap zamanlamasında ve farklı lamda değerlerinde (λ=2.2, λ=1.9, λ=1.7) yapılan deneylerde enjeksiyon zamanlaması avansa alındıkça maksimum silindir içi basıncın daha erken elde edildiği ve arttığı görülmüştür. Aynı zamanda, lamda azaldıkça maksimum silindir basıncının ve ısı dağılımının arttığı gözlemlenmiştir. Enjeksiyon zamanlaması avansa alındıkça indike termik verim belli bir değere kadar artış göstermiş, daha fazla avansa alındığında indike termik verimdeki artış azalmıştır. Maksimum indike termik verim % 42.47 ile 80°KA enjeksiyon zamanlaması ile λ=2.2 değerinde elde edilmiştir.


Anahtar kelimeler


Reaktif kontrollü sıkıştırma ile ateşlemeli yanma, Yanma, Enjeksiyon zamanlaması, Yanma verimi, Lamda

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