Investigations on Low Heat Rejection Diesel Engine With Crude Jatropha Oil as an Alternate Fuel

Abstract

Jatropha oil, a non-edible vegetable oil shows a greater potential for replacing conventional diesel fuel quite effectively, as its properties are compatible to that of diesel fuel. But low volatility and high viscosity of jatropha oil call for hot combustion chamber, which is provided by a low heat rejection diesel engine with threaded air gap piston and liner with superni-90 inserts. The performance of the engine with jatropha oil is obtained with different versions of the engine such as conventional engine and insulated engine at normal and preheat condition of the oil, with varying injection pressure and timing and compared to the engine with pure diesel operation at recommended injection pressure and timing. Increase of thermal efficiency of 18% and reduction of NOx levels by 5% are observed at optimized injection timing and at higher injection pressure with insulated engine at preheat condition of jatropha oil in comparison with pure diesel operation on conventional engine.

An Experimental Investigation of Performance and Pollution Levels on Di Diesel Engine with Waste Fried Cooking Oil and its Bio Diesel

“…There was a 6% reduction in VE for used cooking oil operation in comparison to diesel fuel operation, the reason being the accumulation of more quantity of unburnt fuel. Earlier studies also revealed the same trends [13,17] The values of Volumetric efficiency were observed to be in ascending order for used cooking oil, biodiesel and diesel. This Was because of better combustion in case of diesel…”

Experimental Investigation on Exhaust Emissions With Ceramic Coated Diesel Engine Using Linseed Oil Based Biodiesel

“…free fatty acids [31].The methyl ester was produced by chemically reacting the linseed oil with an alcohol (methyl), in the presence of a catalyst (KOH). A two-stage process was used for the esterification [32][33] of the waste fried vegetable oil. The first stage (acid-catalyzed) of the process is to reduce the free fatty acids (FFA) content in linseed oil by esterification with methanol (99% pure) and acid catalyst (sulfuric acid-98% pure) in one hour time of reaction at 55°C.…”

Performance Evaluation of a Low Heat Rejection Diesel Engine with Mohr Oil Based Biodiesel

“…Air gap was created (Rama Mohan et al, 1999) in the nimonic piston crown and experiments were conducted with pure diesel and reported that BSFC increased by 7% with varied injection timings. Investigations were carried (Murali Krishna, 2004) with air gap insulated piston with superni crown and air gap insulated liner with superni insert with varied injection pressures and injection timings with alternate fuels of alcohols and vegetable oils and reported LHR engine improved efficiency and decreased pollution levels.…”