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二甲醚对乙醇内燃机性能的影响

Keywords: 内燃机,乙醇,二甲醚,燃烧,排放

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Abstract:

对乙醇掺二甲醚点燃式内燃机的性能进行研究.试验在加装了电控二甲醚喷射系统的内燃机上进行,从而保证乙醇与二甲醚能同时喷入进气道.在转速为1800r/min、进气道绝对压力为61.5kPa、过量空气系数分别为1.0及1.1的条件下,通过逐渐增加二甲醚的喷射脉宽,使二甲醚占进气的体积分数从0加至3%.结果表明:随掺二甲醚体积分数的增加,内燃机指示热效率提高,循环变动降低,CO、HC排放降低,但NOx略有升高.

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