喷油压力和提前角对柴油机排放影响的试验研究

Experimental study on effect of fuel injection pressure and advance angle on diesel engine emission

为降低船舶柴油机排放,以某船用四冲程中速柴油机为研究对象,通过改变发动机的喷油压力和供油提前角,进行多组对比试验,研究喷油压力和供油提前角对CO、NO_(x)和PM排放的影响。试验结果表明:随着喷油压力的增加,尾气中CO和PM的质量分数降低,NO_(x)的质量分数小幅增加;随着供油提前角的减小,尾气中NO_(x)的质量分数显著降低,CO和PM的质量分数整体上升。

In order to reduce the emission of marine diesel engine,a four stroke medium speed diesel engine is taken as the research object.By changing the fuel injection pressure and fuel injection advance angle of the engine,several groups of comparative tests are carried out to study the effects of fuel injection pressure and fuel injection advance angle on CO,NO_(x)and PM emissions.The results show that the mass fraction of CO and PM in exhaust gas decreases and the mass fraction of NO_(x)increases slightly with the increase of injection pressure.With the decrease of fuel supply advance angle,the mass fraction of NO_(x)in exhaust gas decreases significantly,and the mass fraction of CO and PM increases.