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Bu çalışmada dört zamanlı, tek silindirli, port enjeksiyonlu bir benzinli motordan (SI) homojen dolgulu sıkıştırma ile ateşlemeli motora (HCCI) dönüşümü yapılmış Ricardo Hydra test motoru kullanılmıştır. Referans heptan ve heptan/etil alkol karışımlarının (E15 ve E25) yanma, motor performansı ve egzoz emisyonlarına etkisi deneysel olarak incelenmiştir. Emme havası giriş sıcaklığı 60℃’de sabitlenmiş ve motor hızı 800 rpm olarak belirlenmiştir. Farklı hava fazlalık katsayısı (HFK) değerlerinde silindir içi basınç, ısı dağılımı, yanma başlangıcı, CA50, yanma süresi, indike termik verim, indike ortalama efektif basınç (IMEP) ve egzoz emisyon sonuçları incelenmiştir. Heptan yakıtına etil alkol ilavesi yanmanın gecikmeye alınarak uzamasına neden olmuştur. Ayrıca yanmanın yavaşlatılması sağlanmıştır. Buna bağlı olarak basınç artış oranı azalarak HCCI yanma kontrol altına alınmıştır. En yüksek indike termik verim E15 yakıtı kullanımında HFK’nın 2 olduğu şartlarda %49 olarak belirlenmiştir. En yüksek IMEP E25 yakıtı kullanımında HFK’nın 1,3 olduğu şartlarda 6,1 bar olarak tespit edilmiştir. CO ve HC emisyonları ise heptan yakıtına etil alkol ilave edilmesi ile eş zamanlı olarak artış göstermiştir. Karışım yakıtları kullanımında silindir içi gaz sıcaklıklarının heptana göre düşük olması, yüksek emisyon değerlerinin temel nedeni olduğu ifade edilebilir. E15 yakıtının uygun çalışma şartlardında ideal yakıt olduğu bu çalışma ile ifade edilebilir.
This study used the Ricardo Hydra test engine, which was converted from a four-time, single-cylinder, port-injected petrol engine (SI) to a homogeneous filling compression (HCCI). The effect of reference heptan and heptan/ethyl alcohol mixture (E15 and E25) on burning, motor performance and emissions has been experimentally studied. The absorption air entrance temperature is fixed at 60°C and the engine speed is set at 800 rpm. Different air surplus ratio (HFK) values have studied in-cylinder pressure, heat distribution, burning start, CA50, burning time, index thermal efficiency, index average effective pressure (IMEP) and emission outcomes. The addition of ethyl alcohol to heptan fuel has caused it to be extended by delayed burning. The burning has also been slowed. As a result, the pressure increase rate was reduced and HCCI burning was controlled. The highest index thermal efficiency is determined at 49% in terms of HFK 2 in the use of fuel E15. The highest IMEP E25 fuel consumption was identified as 6.1 bar in terms of 1.3 HFK. CO and HC emissions have increased simultaneously with the addition of ethyl alcohol to heptan fuel. In the use of mixed fuels, it can be stated that the cylinder gas temperatures are low compared to heptan, which is the main reason for high emission values. This study can be expressed by the fact that the E15 fuel is the ideal fuel in appropriate working conditions.
In this study, Ricardo Hydra test engine which has been converted from a four stroke, single cylinder, port injection spark ignition (SI) engine to homogeneous charged compression ignition (HCCI) engine was used. The effect of reference heptane and heptane / ethyl alcohol mixtures (E15 and E25) on combustion, engine performance and exhaust emissions was investigated experimentally. The intake air inlet temperature is fixed at 60℃ and the engine speed is determined as 800 rpm. In-cylinder pressure, heat release, start of combustion, CA50, combustion duration, indicated thermal efficiency, indicated mean effective pressure (IMEP) and exhaust emission results were investigated at different lambda values. Addition of ethyl alcohol to heptane resulted in delayed and prolonged combustion. Also this provided to slowing of the combustion. Consequently, the pressure rise rate decreased and HCCI combustion was controlled. The highest indicated thermal efficiency was found to be 49% when the lambda value was 2 and use of E15 fuel. The highest IMEP was found to be 6,1 bar when the lambda value was 1,3 and use of E25 fuel. CO and HC emissions increased simultaneously with the addition of ethyl alcohol to the heptane fuel. Compared to heptane, when the E15 and E25 fuels are used, it can be stated that the low in-cylinder gas temperatures are the main reason for the high emission values. It can be stated that E15 fuel is the ideal fuel under suitable operating conditions via this study.
Alan : Fen Bilimleri ve Matematik
Dergi Türü : Uluslararası
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