【摘要】：由于取消了氣缸蓋,對置活塞二沖程(OP2S)汽油機的火花塞只能布置于氣缸側(cè)壁。因此在單火花塞點火時,缸內(nèi)火焰?zhèn)鞑ゲ粚ΨQ,導致OP2S汽油機具有較明顯的爆震傾向。為了有效地抑制爆震的發(fā)生,利用三維CFD軟件對OP2S直噴汽油機在不同火花塞數(shù)目下缸內(nèi)的燃燒過程進行了數(shù)值仿真,并結(jié)合試驗研究了火花塞數(shù)目對混合氣燃燒特性的影響,分析了不同火花塞數(shù)目對缸內(nèi)燃燒壓力、燃燒持續(xù)期及燃燒放熱率的影響規(guī)律。研究結(jié)果表明,增加火花塞數(shù)量可以有效改善缸內(nèi)的燃燒情況,而對側(cè)布置雙火花塞的布置形式為最佳方案。
[Abstract]:Due to the cancellation of the cylinder head, the spark plugs of the OP2S gasoline engine can only be arranged on the side wall of the cylinder. Therefore, when a single spark plug is ignited, the flame propagation in the cylinder is asymmetric, which leads to the obvious detonation tendency of the OP2S gasoline engine. In order to suppress the occurrence of detonation effectively, the combustion process of OP2S direct injection gasoline engine under different spark plug numbers was numerically simulated by using three dimensional CFD software, and the effect of spark plug number on the combustion characteristics of mixture was studied in combination with experiments. The effects of different spark plug numbers on the combustion pressure, combustion duration and combustion heat release rate were analyzed. The results show that increasing the number of spark plugs can effectively improve the combustion situation in the cylinder, and the best scheme is to arrange the two spark plugs on the opposite side.
【作者單位】： 北京理工大學機械與車輛學院;中北大學機械與動力工程學院;
【分類號】：TK411

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