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为了研究油气比对超燃发动机自点火性能的影响,利用二维非定常化学非平衡计算方法模拟了总温2000K,总压3.0MPa,入口马赫数3.0,煤油油气比为0.2和1.0时超燃发动机的自点火过程。具体可以得到以下结论:(1)总油气比越高,燃料传播速度越快;燃料首先沿着剪切层传播至凹槽后缘,之后在凹槽漩涡的带动下向凹槽上游和底部传播。(2)凹槽回流区温度高,点火延迟时间短,低油气比的气体一旦进入凹槽回流区后即可在凹槽后缘和上方点火。(3)火焰从凹槽的上沿和右边向凹槽底部和左边传播。(4)总油气比越高,点火越困难。
In order to study the influence of the ratio of oil to gas on the ignition performance of a super-fueled engine, a two-dimensional unsteady chemical unbalance calculation method was used to simulate the effects of the total temperature 2000K, the total pressure 3.0MPa, the inlet Mach 3.0, the kerosene gas ratio of 0.2 and 1.0 The ignition of the engine. Specifically, the following conclusions can be drawn: (1) The higher the total oil-gas ratio, the faster the fuel is propagating; the fuel first propagates along the shear layer to the trailing edge of the groove and then propagates toward the upper and lower grooves, driven by the groove vortex . (2) High temperature in the recirculation zone of the groove, short ignition delay time, once the gas with low oil-gas ratio enters the recirculation zone of the groove, it can be ignited on the trailing edge and above the groove. (3) The flame propagates from the upper edge and the right edge of the groove toward the bottom and left of the groove. (4) The higher the total oil-gas ratio, the harder it is to ignite.