Çift Yakıtlı Dizel Bir Motorda BD35 (Biyodizel/Dizel Karışımı) ve Propanol Kullanımının Yanma Karakteristiklerine Etkisinin İncelenmesi

Öz

Bu çalışma, reaktivite kontrollü sıkıştırma ateşleme modunda çalışacak şekilde modifiye edilmiş dizel bir motorda düşük reaktiviteli yakıt olarak propanol ve yüksek reaktiviteli yakıt olarak BD35 yakıtlarının kullanımının motorun yanma karakteristiklerindeki değişimini incelemektedir. Araştırmada, %35 biyodizel ve %65 petrol kökenli dizel karışımından oluşan BD35 yakıtı, yüksek reaktiviteli yakıt olarak doğrudan silindire püskürtülürken, reaktivite kontrollü sıkıştırma ateşleme için düşük reaktiviteli yakıt olarak propanol düşük basınçta emme kanalına püskürtülmüştür. Deneylerde propanol %0, %15, %30 ve %45 olmak üzere dört farklı ön karışım oranında kullanılmıştır. Deneyler %60 motor yükü ve 2400 (d/d) sabit motor hız şartları altında gerçekleştirilmiştir. Elde edilen verilere göre, karışım oranının artmasıyla birlikte silindir içi maksimum basınç değerinin arttığı ve özellikle %45 karışım oranı kullanımında önemli bir artış meydana geldiği tespit edilmiştir. Reaktivite kontrollü sıkıştırma ateşleme konsepti altında test motorunda propanolun düşük reaktiviteli yakıt olarak kullanılmasının ortalama indike basınç değerinde azalmaya neden olduğu gözlemlenmiş olmasına rağmen, karışım oranının artmasıyla birlikte ortalama indike basınçtaki azalma hızının yavaşladığı belirlenmiştir. Son olarak, karışım oranının artmasıyla birlikte silindir içi sıcaklığın önemli ölçüde azaldığı belirlenmiştir. Tüm bulgular analiz edildiğinde, reaktivite kontrollü sıkıştırma ateşleme modunda çalışacak şekilde modifiye edilmiş dizel motorlarda düşük reaktiviteli yakıt olarak propanol ve yüksek reaktiviteli yakıt olarak BD35 kullanımının yüksek yükte motor performansı üzerindeki etkilerini anlamak adına önemli bir yol göstermiştir.

Anahtar Kelimeler

• RCCI
• Biyodizel
• Propanol
• Yanma
• BD35

Proje Numarası

118M650

Investigation of The Effects of BD35 (Biodiesel/Diesel Blend) and Propanol Usage in Combustion Characteristics in A Dual Fuel Diesel Engine

Öz

This study investigates the changes in the combustion characteristics of a diesel engine modified to operate in reactivity controlled compression ignition mode using propanol as low reactivity fuel and BD35 as high reactivity fuel. In the study, BD35 fuel, a blend of 35% biodiesel and 65% petroleum-derived diesel, was sprayed directly into the cylinder as a high reactivity fuel, while propanol was sprayed into the intake manifold at low pressure as a low reactivity fuel for reactivity controlled compression ignition. Four different low reactivity fuel premixed ratios of 0%, 15%, 30% and 45% propanol were used in the experiments. The experiments were carried out under 60% engine load and 2400 (rpm) constant engine speed conditions. According to the data obtained, it was found that the maximum in-cylinder pressure value increased with the increase in the premixed ratio and a significant increase occurred especially when 45% premixed ratio was used. Although the use of propanol as low reactivity fuel in the test engine under the reactivity controlled compression ignition concept was observed to cause a decrease in the indicated mean effective pressure, the rate of decrease in the indicated mean effective pressure was found to slow down as the premixed ratio increased. Finally, it was found that the in-cylinder gas temperature decreased significantly with increasing the propanol premixed ratio. When all the findings are analyzed, it has shown an important way to understand the effects of propanol as low reactivity fuel and BD35 as high reactivity fuel on engine performance at high load in diesel engines modified to operate in reactivity controlled compression ignition mode.

Anahtar Kelimeler

• RCCI
• Biodiesel
• Propanol
• Combustion
• BD35

Destekleyen Kurum

Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK)

Proje Numarası

118M650

Teşekkür

This study was performed under the framework of a project numbered 118M650, financed by the Turkey Scientific and Technological Research Council (TUBITAK).

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