Jaichandar SRİRAMULU, Annamalai KANDASWAMY, K. Annamalai, P. ARİKARAN

Comparative evaluation of pongamia biodiesel with open and re-entrant combustion chambers in a DI diesel engine / İkili Dizel Motor İçerisindeki Açık Ve Yeniden Girişli Yanma Odalarında Hint Kayın Ağacı Biyodizelinin Karşılaştırmalı Değerlendirmesi

Öz The influence of 20% blend of Pongamia Oil Methyl Ester (POME20) as alternative diesel fuel has been studied using a kirloskar made single cylinder, four stroke, direct injection diesel engine. Without altering the compression ratio of the engine, the piston’s combustion chamber geometry was modified to have Shallow depth combustion chamber, Toroidal combustion chamber, Shallow depth re-entrant type combustion chamber and Toroidal re-entrant type combustion chamber from the standard Hemispherical open type combustion chamber. Performance and emission tests were conducted for these five types of combustion chamber geometries to study the performance characteristics such as brake thermal efficiency, brake specific fuel consumption and emission characteristics such as unburned hydrocarbons, carbon monoxide, oxides of nitrogen and smoke emissions. The test results showed that substantially higher brake thermal efficiency and lower specific fuel consumption for toroidal re-entrant type combustion chamber. Sharp reduction of particulates, carbon monoxide and unburnt hydrocarbons were observed for toroidal re-entrant type combustion chamber compared to the other two. On the other hand oxides of nitrogen (NOx) were higher for toroidal re-entrant type combustion chamber. Özet: Alternatif bir dizel yakıt olarak Hint Kayın Ağacı Yağı Metil Esteri’nin %20 oranında karışımının (POME20) etkisi, Kirloskar yapımı tek silindirli, dört zamanlı, doğrudan püskürtmeli bir dizel motorda çalışılmıştır. Motorun sıkıştırma oranını değiştirmeden, piston üzerindeki açık yarım küre şeklindeki yanma odası geometrisi sığ bir yanma odası, halka şekilli (toroidal) yanma odası, sığ derinlikli ve yeniden girişli yanma odası ve halka şekilli yeniden girişli yanma odası olacak şekilde değiştirilmiştir. Performans ve salınım testleri sayılan bu beş adet yanma odası için fren termal verimi, fren özgül yakıt tüketimi gibi performans karakteristikleri ve yanmamış hidrokarbonlar, karbon monoksit, nitrojen oksitleri ve duman salınımları gibi salınım karakteristikleri açısından çalışılmıştır. Test sonuçları halka şeklinde yeniden girişli yanma odası için dikkate değer miktarda yüksek fren termal verimi ve düşük özgül yakıt tüketimi göstermiştir. Aynı yanma odası için partikül madde salınımı, karbon monoksit ve yanmamış hidrokarbon değerlerinde de diğer iki yanma odası ile karşılaştırıldığında keskin düşüş gözlemlenmiştir. Diğer taraftan bu yanma odası tipi için nitrojen oksitler (NOx) daha yüksektir.

Anahtar Kelimeler:

Biodiesel, Diesel Engine, Combustion Chamber, Performance, Emissions / Biyodizel, Dizel Motor, Yanma Odası, Performans, Salınımlar

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