End gas autoignition and knock in a spark ignition engine
End gas autoignition and knock in a spark ignition engine
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DOI：
10.4271/902135
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发表时间：
1990-10
期刊：
影响因子：
--
通讯作者：
G. Konig;C. Sheppard
中科院分区：
文献类型：
--
作者：
G. Konig;C. Sheppard
研究了柴油机尾气自燃、爆震严重程度和诱导气流速度的大小。一个光学访问单缸二冲程发动机进行了修改，以提供完整的开销光学访问盘形燃烧室。使用高速自然光和纹影摄影记录火焰传播和尾气自燃事件;使用油滴轨迹技术确定在爆震事件之前和由爆震事件引起的局部气体运动。在气缸盖周围的三个位置同步记录气缸压力，其中一个传感器的输出同时显示在胶片上。末端气体自燃一般是多中心发展起来的。自燃通常，但并非总是，其次是爆震。爆震的严重性增加的自燃发生后的上止点位置更接近的发病，爆震的特点是压力振荡，碳的形成和高速爆震后气体运动。这些现象是相对不敏感的质量分数在自燃时未燃。
The paper is concerned with end-gas autoignition, subsequent knock severity and magnitude of induced gas velocity. An optically accessed single cylinder two stroke engine was modified to give complete overhead optical access to the disc-shaped combustion chamber. Flame propagation and end-gas autoignition events were recorded using high speed natural light and schlieren photography; local gas motions, prior to and induced by the knock event, were determined using an oil droplet trajectory technique. Cylinder pressure was synchronously recorded at three positions around the cylinder head; one transducer's output being simultaneously displayed on the film. End gas autoignition generally developed from multiple centers. Autoignition was usually, but not invariably, followed by knock. The severity of knock increased as the onset of autoignition occurred closer behind the top dead centre position; knock was characterized by pressure oscillations, carbon formation and high velocity post-knock gas motions. These phenomena were relatively insensitive to mass fraction unburned at the time of autoignition.