Performance and Emission analysis of optimal DEE blended Pongamia pinnata L. biodiesel fuelled to EGR coupled Low Heat Rejection (LHR) Diesel Engine

To enhance the engine thermal efficiency and simultaneous decrease of emissions, an experimentation was done with 10% constant rate of exhaust gas recirculation (EGR) coupled low heat rejection (LHR) diesel engine developed via 8 YSZ (8% mol. yttria-stabilized zirconia) ceramic material coated cylinder head and liner fuelled by optimal blend B85A15 by vol. (Karanja based biodiesel 85% + additive diethyl ether 15%). Experiments were carried out on the regular engine (RE) and LHR engine fuelled by test fuels (diesel and blend B85A15) at different loads (0%, 20%, 40%, 60%, 80% and 100%) and Injection timings (30° BTDC to 34° BTDC). From the results, it was found that advancement of injection timing significantly improved all the investigated parameters except NOx for both the engines and in comparison the optimum results were 6.5% enhancement in brake thermal efficiency (BTE) with the reduction of 4.5% in brake specific energy consumption (BSEC), 44% in particulate matter density and 18.5% in NOx emissions found for LHR engine fuelled by B85A15 at 33° BTDC with an 80% load compared to RE with diesel. The optimum configuration of RE found to be diesel fuel at injection timing 31° BTDC with 80% load.