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众所周知,电火花点火的汽油发动机(内燃机)的动力性、经济性及排气中有害气体含量的多寡完全由气缸内混合气的燃烧过程决定,火焰在气缸中的传播速度是混合气燃烧过程的主要表征。因而,测定火焰传播速度是研究混合气燃烧过程及燃烧机理的重要手段。火焰传播速度可由火焰通过气缸内两确定点间的时间来确定,为实现对火焰传播速度的测定,我们设计了时间采集系统。火焰传播速度由气缸内混合气的浓度、压力、温度及其他多种因素共同决定,所以即使在宏观稳定工况下,在各个不同工作循环中,火焰通过气缸内两确定点间的时间也是一个随机变量。在连续工作循环中,火焰通过气缸内两确定点间的时间特性如图1所示。
As we all know, spark ignition gasoline engine (internal combustion engine) of the power, economy and the amount of harmful gases in the exhaust gas completely by the mixture in the cylinder combustion process, the flame propagation speed in the cylinder is the combustion process Main characterization. Therefore, the determination of flame propagation velocity is an important means to study the combustion process and combustion mechanism of mixture. The speed of flame propagation can be determined by the time it takes for the flame to pass through two defined points in the cylinder. To achieve the measurement of flame propagation velocity, we have designed a time acquisition system. Flame propagation speed is determined by the concentration, pressure, temperature and other factors of the mixture in the cylinder. Therefore, the time for the flame to pass through the two determined points in the cylinder is the same even in a macroscopically stable condition in each different working cycle Random Variables. In a continuous duty cycle, the time characteristic of a flame passing through two defined points in a cylinder is shown in FIG. 1.