汽油机掺烧甲醇裂解气试验研究

在1台电喷汽油机上进行了掺烧甲醇裂解气试验研究,设计了甲醇裂解系统,利用发动机高温排气裂解甲醇,并将裂解气送入气缸燃烧,研究了掺烧甲醇裂解气对发动机经济性和动力性的影响.试验结果表明:在管式裂解器中,甲醇裂解的主要产物是H2和CO,体积分数分别为60.7%~64.8%,19.1%~23.1%;汽油掺烧甲醇裂解气会导致发动机输出扭矩降低,发动机当量燃料消耗率下降,热效率增加,甲醇替代比为20%时,不同负荷下当量燃料消耗率均下降6%以上,最大可降低8.8%,有效热效率由原机32.47%提高到35.57%;原机和掺烧裂解气发动机的有效热效率均随过量空气系数的增加而增加,相同过量空气系数条件下,掺烧裂解气发动机热效率比原机高.

Experimental Study on Performance of SI Engine Fueled with Gasoline and Dissociated Methanol Blends

The experimental study on performance of an electronic control injection gasoline engine fueled with gasoline and dissociated methanol blends was conducted .The dissociation system for methanol was designed ,methanol was dissociated with the high temperature exhaust in the dissociated reactor ,the dissociated methanol gas joined in the combustion of gasoline and the influences of dissociated methanol on the fuel economy and engine power were researched .The main components of dissoci-ated methanol were hydrogen and carbon monoxide ,60 .7%-64 .8% and 19 .1%-23 .1% volume fraction respectively .The par-ticipation of dissociated methanol would lead to output torque ,and equivalent specific fuel consumption decrease and effective thermal efficiency increase .The equivalent specific fuel consumption decreased by 6% to 8 .8% and the effective thermal effi-ciency increased from 32 .47% to 35 .57% when the proportion of methanol substitution was 20% .The effective thermal effi-ciency for the original engine and the engine fueled with dissociated methanol blends both increased with the increase of excess air coefficient .Gasoline engine fueled with the blends had higher effective thermal efficiency in the same excess air coefficient condition .