Optimization of exhaust emissions,vibration, and noise of a hydrogen enriched fuelled diesel engine

In this study, the effects of various input parameters are examined on exhaust emissions, vibration, and noise of an unmodified diesel engine. The primary aim of this study is to optimize the vibration, noise, and exhaust emissions of the engine to get optimal configuration parameters. Experiments were carried out on a four-stroke, four-cylinder, diesel engine fuelled with diesel-biodiesel-hydrogen blends. To minimize the number of experiments Box-Behnken design (BBD) has been adopted. Optimum desirability is found as 0.862 with hydrogen addition of 4.63 L/min, fuel blend of 26.8% and 1500 rpm engine speed for the diesel engine. When the diesel engine is operated at 1500 rpm engine speed and fuelled with 4.63 L/min hydrogen addition and 26.8% biodiesel blend ratio; the optimum responses of CO, CO₂, NO_x, vibration, and noise are established as 214 ppm, 1.35%, 90.4 ppm, 38.6 m/s², and 91.3 dBA], respectively. The predicted values were confirmed experimentally and the errors in predicted values are found in a limit range.