Performance Evaluation of Biodiesel Usage in Diesel Engines with Different Combustion Chamber Shapes
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Abstract
This paper examines the dynamics of performance in diesel engines powered by biodiesel, focusing on the impact of various combustion chamber configurations. Understanding how diverse combustion chamber designs can impact the engine effectiveness, pollutant characteristics and efficiency of combustion under varied operating situations is the main goal. The study used a 25% mixture of corn oil methyl ester (COME25) biodiesel to test a toroidal cavity piston (TCP) engine and a regular hemispherical cavity piston (HCP) engine. When compared to the COME25 HCP engine, the TCP engine exhibits a notable 2.14% gain in brake thermal efficiency (BTE) at maximum power. This improvement is ascribed to the TCP engine capacity to produce increased cylinder swirl and turbulence, which leads to more effective combustion. While pollutants of hydrocarbons and carbon monoxide are reduced by 25% and 28% respectively, with full-power functioning, nitrous oxide emissions increase by 14%. Together with the TCP engine and COME25 mix, the study also examines the changes in compression ratio. Improving both CR and combustion chamber geometry can result in a 9.6% decrease in brake specific fuel consumption and a 2.31% improvement in BTE. This illustrates the possible advantages of optimizing engine settings to increase its performance.
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