【作者】

Zongying Gao，Deqing Mei

【摘要】

论文已在中国上海举行的2013年CIMAC大会上发表。论文的版权归CIMAC所有。Renewable biomass energy, especially the high-grade liquid fuels such as esters and alcohols, has been adopted widely in internal combustion engines. As compared to pure diesel, when the engine is fuelled with ethanoldiesel, the combustion start timing is postponed, in-cylinder heat release process is relatively conc entrated, and so the cylinder peak pressure, maximum pressure rise rate and peak heat release rate increase, which leads to the higher conversion efficiency of heat into power. Ethanol-biodiesel could significantly improve the NOx and smoke emissions, except for the higher HC and CO emissions at low and moderate loads. With the increase of load, the HC and CO emissions from engine fueled with ethanol-diesel are roughly equal to that of diesel, and may be even lower than that of diesel at higher loads.The combustion processes of biodiesel and petrolic diesel are illustrated in the crank angle coordinate with the direct flame images combined with analysis of heat release. Due to the contribution of bigger bulk modulus and higher cetane number of biodiesel, the beginning of injection for biodiesel is 0.7°CA earlier than that for diesel, and the ignition time of biodiesel occurs earlier 1.5°CA than that of diesel, under the unimproved conditions of fuel supply system. During the rapid combustion period, both the brightness and its lasting time of biodiesel are less than that of diesel.The heat released by the chemical reactions without obvious flame at the end of combustion only accounts for 2 to 3 percent of the total cycle heat energy released by fuel. Although there are a few differences in properties between biodiesel and diesel, biodiesel still could achieve the perfect substitution for petrolic diesel.

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

2

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