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介绍了液化石油气(LPG)在点燃式发动机上应用时微粒排放特性的试验研究.试验在一台四行程、水冷125mL单缸电喷式发动机上进行.结果表明,LPG在点燃式发动机上应用时也有大量的微粒排放,但其排放的总颗粒数与使用汽油燃料时基本相同.LPG燃料排放的微粒在粒度分布上有双峰分布的特点,但有时第1个峰的特征不明显,第2个峰对应的粒径大小同汽油机基本相同,发动机中等负荷时的微粒排放量最大,浓混合气的微粒排放量高,微粒的粒数浓度在中等转速时最大.
This paper introduces the experimental study on the characteristics of particulate emission when liquefied petroleum gas (LPG) is used on a spark ignition engine.The test is carried out on a four-stroke, water-cooled 125mL single cylinder EFI engine.The results show that LPG is applied to the ignition type engine But also a large amount of particulate emissions, but the total emissions of particles and the use of gasoline fuel is basically the same LPG fuel particles in the distribution of particle size distribution has a bimodal distribution characteristics, but sometimes the characteristics of the first peak is not obvious, the first The particle size of the two peaks is basically the same as that of the gasoline engine. The engine emits the largest amount of particulate emissions at medium load, the particulate emissions of the rich gas are high, and the particle concentration of the particles reaches the maximum at medium speed.