对置活塞二冲程汽油机多点点火燃烧特性研究
发布时间：2018-09-14 15:41
【摘要】：由于取消了气缸盖,对置活塞二冲程(OP2S)汽油机的火花塞只能布置于气缸侧壁。因此在单火花塞点火时,缸内火焰传播不对称,导致OP2S汽油机具有较明显的爆震倾向。为了有效地抑制爆震的发生,利用三维CFD软件对OP2S直喷汽油机在不同火花塞数目下缸内的燃烧过程进行了数值仿真,并结合试验研究了火花塞数目对混合气燃烧特性的影响,分析了不同火花塞数目对缸内燃烧压力、燃烧持续期及燃烧放热率的影响规律。研究结果表明,增加火花塞数量可以有效改善缸内的燃烧情况,而对侧布置双火花塞的布置形式为最佳方案。
[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.
【作者单位】： 北京理工大学机械与车辆学院;中北大学机械与动力工程学院;
【分类号】：TK411
[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.
【作者单位】： 北京理工大学机械与车辆学院;中北大学机械与动力工程学院;
【分类号】：TK411
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