IMPROVING OF DIESEL COMBUSTION-POLLUTION-FUEL ECOMONY AND PERFORMANCE BY ETHANOL FUMIGATION

Sunulan çalışmada; indirekt püskürtmeli doğal emişli bir dizel motorunda etanol fumigasyonunun (EF'nun) motor performans parametreleri ve NOx emisyonu üzerindeki etkileri deneysel olarak incelenmiştir. Ayrıca burada bazı veriler turboşarjlı motorun sonuçları ile karşılaştırılmıştır. Böylece EF'nun turbo etkisine yakın bir sonuç verip vermediği de belirlenmeye çalışılmıştır. Burada etanol, ana meme kesiti değiştirilebilen basit bir karbüratör ile emme kanalındaki hava içerisine gönderilmiştir ve hacimsel olarak yaklaşık % (2, 4, 6, 8, 10 ve 12) etanol oranları seçilmiştir. Deneyler; iki farklı gaz kolu konumunda, 6 farklı devir sayısında ve 6 farklı etanol oranında yapılmıştır. Seçilen etanol oranları için bulunan motor karakteristikleri ve NOx sonuçları saf dizel yakıtı sonuçları ile karşılaştırılmıştır. Çalışmada kullanılan motor için 1/1 gaz kolu konumunda yapılan deneylerden; etanolün yaklaşık % oranlarında emme kanalından geçmekte olan havanın içerisine püskürtülmesi durumunda NOx emisyonunun azaldığı ve motor performans parametrelerinin iyileştiği belirlenmiştir. 3/4 gaz kolu konumunda ise; % etanol oranlarında ve d/d aralığında EF'nun uygulanabileceği ve böylece efektif güçte önemli bir kötüleşmeye neden olmadan özgül yakıt tüketiminin ve NOx emisyonunu azaltacağı belirlenmiştir. Ayrıca EF'nun motor performans parametrelerini iyileştirdiği ve NOx emisyonunu azaltılabileceği ancak efektif gücü turboşarj sistemi kadar arttıramadığı görülmüştür.

ETANOL FUMİGASYONU İLE DİZEL YANMASININ, KİRLİLİĞİN, YAKIT EKONOMİSİNİN VE PERFORMANSIN İYİLEŞTİRİLMESİ

The aim of the present study is to determine experimentally the effects of ethanol fumigation (EF) on the performance parameters and NOx emission of a naturally aspirated pre-chamber diesel engine and also to compare the EF results to that of turbocharged diesel engine. By this way, it has also been indented to determine whether or not EF gives power increment at the level of turbocharging. The engine which was originally turbocharged has been converted to naturally aspirated diesel engine by dismantling its turbocharging system. Here, ethanol was introduced into the intake air by a carburetor, which main nozzle section is adjustable to give approximately (2, 4, 6, 8, 10 and 12) % (by vol.) ratios. Experiments were performed at two diesel fuel delivery rates (FDRs), six different engine speeds for six different ethanol fumigation ratios (EFRs). Variations of performance parameters and NOx emission for these six ethanol percentages in respect to neat diesel fuel (NDF) were determined and compared. It was determined that for 1/1 FDR, ? % ethanol addition into the intake manifold reduces NOx emission and improves engine performance for this engine. But, fuel cost for ? % ethanol addition is expensive. For 3/4 FDR; ? % ethanol fumigation can be applied at rpms in this engine and for these conditions NOx emission and bsfc decrease simultaneously without any significant effective power penalty. Also, it was concluded that EF improves engine performance parameters and NOx emission but does not increase effective power at the level of turbocharged version

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