汽车用掺氢汽油发动机的试验研究

作者对掺氢汽油发动机进行了试验研究和理论分析,并与原汽油发动机进行了台架和装车对比试验。结果表明,在汽油机中添加少量氢后,由于氢起到助燃剂的作用,缩短了着火延迟期,火焰传播速度加快,使发动机燃烧完全,并可实现稀燃。在部分负荷下热效率提高率约为7％～15％,低负荷下提高更为明显;汽油油耗率下降率约为20％～25％,低负荷下下降更为显著。在中等负荷(60％左右负荷)范围下,加氢率在5％左右效果较好,低负荷下加氢率应较大,高负荷下加氢率应小。汽油机加氢后,能够改善燃烧,提高热效率和节省汽油,具有节能、省油和改善排放的效果。

An Investigation on Gasoline-Hydrogen Fueled Vehicle Engine

Experimental research and theoretical analysis were made on a gasoline-hydrogen fueled engine reformed by the authors. The results of the comparative tests with the original gasoline engine , both on the bench test and on the bus running test, show that a small amount of hydrogen added into gasoline engine, which acts as a burning promoter, can shorten the ignition delay greatly, speed up the flame propagation, improve the combustion obviously and lean burning is realized. When running at part load, the rate of thermal efficiency increase is 7% -15%, and even higher at light loads; the rate of specific gasoline consumption decrease is 20%-25%, and even lower at light loads. Running at middle range of loads, 5% of added hydrogen mass fraction is suitable, when running at light loads, the hydrogen added should be more, and less at high loads. With the addition of hydrogen, the thermal efficiency can increase obviously and the gasoline can save remarkably, which is of significance in saving energy and gasoline.