Compressed Biogas with Biodiesel as Pilot Fuel Performance on Novel Variable Compression Ratio Mechanism Assisted DI Diesel Engine

In this paper the effect of renewable fuels like blending of Mahua biodiesel with 20% and compressed biogas fuel performance in dual fuel mode using single cylinder direct injection diesel engine has been evaluated. The engine utilizing non-conventional fuels with lower calorific value increases the harmful emissions such as UHC and reduces power output of the engine. To overcome this drawback, the variable compression ratio (VCR) assisted diesel engine is experimented to variable load and speed. In this study, the compression ratio 12, 14, 16, and 18 has been analyzed. The unique feature of the testing is that the automatic variation in compression ratio as per load and speed of the engine using novel mechanism incorporate the variable injector location also using the novel VCR mechanism. The smooth variation in compression ratio causes the compete combustion of the charge and hence 20% increment in efficiency could be achieved with respect to base CR12.