Abstract Stable and efficient combustion is critical for low Mach starting stage of Dual-Mode Scramjet. In this paper, basic experimental validation and three-dimensional simulation of hydrogen addition and fuel additive effects on kerosene supersonic combustion performance were conducted under flight Mach 3.8 inflow conditions. Hydrogen addition was injected independently and the additive effects were simulated by the method of reducing activation energy. The simulation results are well-agreed with the experimental measurements from hydrogen addition cases and 20%-vol additive cases, validating the numerical method and models employed. The relative activation energy needed for well simulating 20%-vol additive effects tends to be higher than the theoretical prediction and also different by equivalence ratios. The heat release is intensified by either hydrogen addition or fuel additive, resulting in higher temperature-rises and pressure-rises, and more OH radicals for combustion enhancements at low-temperature conditions. An appropriate small amount of hydrogen addition (ERH

中文翻译：

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低马赫流量条件下加氢和燃料添加剂的煤油超音速燃烧性能研究

摘要 稳定高效的燃烧是双模超燃冲压发动机低马赫启动阶段的关键。在本文中，在飞行马赫数为 3.8 的流入条件下，对加氢和燃料添加剂对煤油超音速燃烧性能的影响进行了基本实验验证和三维模拟。单独注入氢气，通过降低活化能的方法模拟加氢效应。模拟结果与氢添加情况和 20% 体积添加情况下的实验测量结果非常一致，验证了所采用的数值方法和模型。很好地模拟 20%-vol 加性效应所需的相对活化能往往高于理论预测，并且当量比也不同。加氢或燃料添加剂会加剧放热，导致更高的温升和压力升高，以及更多的 OH 自由基在低温条件下增强燃烧。适量加入少量氢（ERH