【摘要】 在一台单缸火花点火发动机上开展了燃用不同组分配比的煤层气燃料燃烧和排放特性的试验研究,分析了发动机燃用不同组分的煤层气在不同负荷下的缸压、放热率、火焰发展期、主燃烧期及其排放性能。研究结果表明:随着煤层气中氮气体积分数的增加,最高缸内压力和压力升高率降低,燃烧放热率峰值下降,火焰发展期变长,放热率曲线型心对应的曲轴转角偏离上止点;发动机HC和CO排放浓度增大,而NOx排放大幅度下降。更多还原

【Abstract】 An experimental study on combustion and emission characteristics of a single cylinder spark ignition engine fueled with different composition coal-bed methane gas was executed.The peak cylinder pressure,the heat release rate,the flame development duration,the main combustion duration and emission characteristics of the engine fueled with coal-bed gas including 0 %~35 % nitrogen volume fraction in the blends were analyzed under different loads.The results show that with the increase of nitrogen volume fraction,the peak cylinder pressure,the maximum pressure rise rate and the peak heat release rate decrease,the flame development duration increases,the crank angle at the center of heat release curve moves apart from the top dead center(TDC).At the same time,the exhaust HC and CO increase,the NOx emission decreases remarkably with the increase of nitrogen volume fraction.更多还原