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:给出在定容燃烧弹中火花点燃 CH4-空气充量进行湍流预混合燃烧的试验结果并进行了分析 ,得到一些有价值的结论 :如在火核起始发展期中存在一个最小火焰传播速度 ,此时的火核半径与湍流积分长度标尺大致相等 ,增加湍流强度 (u <1 .8m/s) ,瞬时燃烧率增加 ,燃烧持续期缩短 ,相对缓燃期增加 ,相对主燃期缩短 ,这是组织湍流可以提高火花点火发动机热效率的主要原因。此外本文还给出不同间隙的失火率并指出减少火核向电极传热是减少失火率的主要措施
: The experiment results of pre-mixed turbulent combustion of CH4-air spark ignited in a constant volume combustion bomb are given and analyzed. Some valuable conclusions are obtained: for example, there is a minimum flame propagation velocity , The radius of the nucleus of fire at this moment is roughly equal to the integral length of the turbulent flow, the turbulent intensity is increased (u <1.8m / s), the instantaneous combustion rate increases, the combustion duration shortens, the relative retardation increases, This is the main reason that turbulence can improve the thermal efficiency of spark ignition engines. In addition, this paper also gives the misfire rate of different gaps and points out that reducing the heat transfer from the core to the electrode is the main measure to reduce the misfire rate