İzopropanol ve Heptan Karışım Yakıtları Kullanımının Bir HCCI Motorda Performans Yanma ve Emisyon Karakteristiklerinin Deneysel İncelenmesi

Yıl 2019, Cilt: 7 Sayı: 4, 818 - 833, 24.12.2019

Alper Calam , Bilal Aydoğan

https://doi.org/10.29109/gujsc.605057

Cited By: 5

Öz

Bu çalışmada tek silindirli, port enjeksiyon sistemine sahip HCCI
motorda, izopropanolün yanma ve egzoz emisyonlarına etkisi deneysel olarak
incelenmiştir. Deneyler 1000 rpm motor hızında ve 60 ^oC emme havası
giriş sıcaklığında gerçekleştirilmiştir. Çalışmada saf n-heptan ve n-heptan
izopropanol yakıt karışımları (ip25 ve ip50) kullanılmıştır. Silindir içi
basınç, ısı dağılımı, yanma başlangıcı, yanma süresi, basınç artış oranı ve
egzoz emisyonları incelenmiştir. Tüm test yakıtlarında da karışımın
fakirleşmesiyle silindir içi basınç ve ısı dağılımının azaldığı tespit
edilmiştir. N-heptan yakıtına izopropanol ilavesi yanma başlangıcının gecikmeye
alınmasına ve yanma süresinin uzamasına neden olmuştur. En yüksek indike termik
verim ip25 yakıtı kullanımında HFK’nın 2.4 oldu şartlarda % 43.27 olarak tespit
edilmiştir. İp25 ve ip50 yakıtları kullanımında n-heptan yakıtına göre CO
emisyonları sırası ile %22.7 ve %62.1 oranında kötüleşmiştir. Bununla birlikte
HC emisyonları sırası ile %8.8 ve %12 oranında artış göstermiştir. N-heptan
yakıtına izopropanol ilavesi, basınç artış oranının azalmasını sağlamıştır.
Böylece kendiliğinden gerçekleşen HCCI yanması kontrol altına alınmıştır.

Anahtar Kelimeler

HCCI, düşük sıcaklık yanması, motor performansı, egzoz emisyonları, yanma, izopropanol

Kaynakça

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