EXAMINATION OF THE EFFECTS OF N-HEPTAN ADDITION TO COTTON METHYL ESTER ON THE ENGINE PERFORMANCE AND COMBUSTION CHARECTERISTICS

Öz

The fuel additives have been studied by many researchers on diesel engine performance and encouraging results have been obtained. During the combustion fuel additives provide the catalyst effect, accelerates the reaction instability and create positive effects on engine performance. In this study; biodiesel was produced by transesterification from the refined cottonseed oil, a certain amount of n-heptane were added in biodiesel and combustion and performance tests were conducted. The experiments was made in a single-cylinder diesel engine at a constant speed and full load. n-heptane added into the cotton methyl ester (PH0) fuel improved the fuel atomization therefore combustion efficiency increased. The maximum power increase was 7.52% in cotton methyl ester fuel containing 8 % n-heptan (PH8). The maximum gas pressure and maximum heat release are formed in almost the same crank angle for all fuels. The 8% n-heptane mixture given the best results in terms of engine performance and combustion characteristics.

Anahtar Kelimeler

• Cottonseed methyl ester
• fuel additive
• combustion characteristics
• engine performance

PAMUK METİL ESTERİNE N-HEPTAN KATKISININ MOTOR PERFORMANSI VE YANMA KARAKTERİSTİKLERİNE ETKİLERİNİN İNCELENMESİ

Öz

Yakıt katkılarının dizel motor performansına etkileri birçok araştırmacı tarafından çalışılmış ve umut verici sonuçlar elde edilmiştir. Katkı maddeleri yanma esnasında katalizör etkisi göstererek yakıt kararsızlığı reaksiyonlarını hızlandırmakta ve motor performansı üzerinde olumlu etkiler oluşturmaktadır. Bu çalışmada; rafine edilmiş pamuk yağından transesterifikasyon yöntemi ile biyodizel üretilmiş, üretilen biyodizellere belirli oranlarda n-heptan katılmış ve test edilmiştir. Deneyler tek silindirli bir dizel motorunda sabit devirde ve tam yükte yapılmıştır.  Pamuk metil esteri (PH0) yakıtı içerisine n-heptan ilavesi yakıt atomizasyonunu iyileştirmiş ve yanma verimliliği artmıştır. Maksimum güç artışı %8 n-heptan içeren pamuk metil esteri ile (PH8) %7.52 olmuştur. Tüm yakıtlar için maksimum silindir gaz basınçları ve maksimum ısı yayılımı hemen hemen aynı krank açısında oluşmuştur. Çalışmada %8 n-heptan karışımı motor performans ve yanma özellikleri bakımından en iyi sonucu vermiştir.

Anahtar Kelimeler

• Pamuk metil esteri
• yakıt katkı maddesi
• yanma karakteristikleri
• motor performansı

Kaynakça

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