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| Effects of performance of marine diesel engine by combustion mixing a small proportion of biodiesel |
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| KeyWord:biodiesel diesel engine vibration combustion |
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| Abstract: |
| In order to explore the applicability of biodiesel on marine diesel engine, based on a six-cylinder medium-speed diesel engine test bench, under different load propulsion characteristics, the power performance, economic performance, vibration characteristics and combustion characteristics in-cylinder of diesel engine burning 0# diesel and B10 biodiesel were analyzed and compared. The results showed that compared with 0# diesel, the output power and fuel consumption of diesel engine burning B10 biodiesel remained basically unchanged, and the fuel consumption rate increased but improved as the load increased.B10 biodiesel made the vibration intensity of the cylinder head of the diesel engine at 25% load decreased, and the vibration intensity of the cylinder head of the diesel engine at 50%, 75%, 90% and 100% load increased slightly, and the vibration intensity of the engine body decreased under different load conditions. It could be seen from the vibration power spectrum density that the vibration response of the two fuels in the low frequency band under different loads was similar, but there was a difference in the vibration response in the high frequency band.The analysis of the pressure in-cylinder and pressure rise rate curves of the two fuels showed that the combustion of B10 biodiesel could increase the peak pressure and maximum pressure increase rate in the cylinder, which accelerated the combustion reaction speed. In summary, B10 biodiesel performs well in terms of power performance, economic power performance, vibration characteristics and combustion characteristics in-cylinder under different load conditions, and has good application prospect on marine diesel engines. |
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