Combustion and emission characteristics of diesel engine fuelled with rice bran oil methyl ester and its diesel blends

Rao Gattamaneni, Saravanan Subramani, Sampath Santhanam, Rajagopal Kuderu
2008 Thermal Science  
There has been a world wide in ter est in search ing for al ter na tives to pe tro leum-derived fu els due to their de ple tion as well as due to the con cern for the en vi ron ment. Veg e ta ble oils have ca pa bil ity to solve this prob lem be cause they are re new able and lead to re duc tion in en vi ron men tal pol lu tion. The di rect use of veg e ta ble oils as a die sel en gine fuel is pos si ble but not pref er a ble be cause of their ex tremely higher vis cos ity, strong ten dency to
more » ... oly mer ize and bad cold start prop er ties. On the other hand, Biodiesels, which are de rived from veg e ta ble oils, have been re cently rec ognized as a po ten tial al ter na tive to die sel oil. This study deals with the anal y sis of rice bran oil methyl es ter (RBME) as a die sel fuel. RBME is de rived through the transesterification pro cess, in which the rice bran oil re acts with meth a nol in the pres ence of KOH. The prop er ties of RBME thus ob tained are com pa ra ble with ASTM biodiesel stan dards. Tests are con ducted on a 4.4 kW, sin gle-cyl in der, nat urally as pi rated, di rect-in jec tion air-cooled sta tion ary die sel en gine to eval u ate the fea si bil ity of RBME and its die sel blends as al ter nate fu els. The ig ni tion de lay and peak heat re lease for RBME and its die sel blends are found to be lower than that of die sel and the ig ni tion de lay de creases with in crease in RBME in the blend. Max imum heat re lease is found to oc cur ear lier for RBME and its die sel blends than diesel. As the amount of RBME in the blend in creases the HC, CO, and soot con cen trations in the ex haust de creased when com pared to min eral die sel. The NO x emis sions of the RBME and its die sel blends are noted to be slightly higher than that of die sel. In tro duc tion The world is on the brink of an en ergy cri sis. The lim ited fos sil fuel re sources are unable to pro vide for the con tin u ously in creas ing de mand for en ergy. This, as so ci ated with increas ing price of fos sil fuel and the aware ness of the im pacts of en vi ron men tal pol lu tion and global warm ing, has forced a search for an al ter na tive source of en ergy, which is re new able, safe and non-pol lut ing. Since com pres sion ig ni tion (CI) en gines are more widely used com pared to spark ig nition (SI) en gines, greater at ten tion is be ing de voted to de velop an al ter na tive source of fuel for
doi:10.2298/tsci0801139g fatcat:f2zvlvhksrcvvkqbdmq4tlgf7q