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为获得固液发动机固体燃料燃面退移的控制因素和机理,开展了数值仿真和试验研究。建立二维轴对称计算模型,考虑燃料与氧化剂的混合燃烧和流动过程,计算得到了固液发动机工作过程中的温度、压强、速度和组分的分布,以及不同时刻固体燃料的燃面形貌。仿真与试验结果的对比证明了计算方法的有效性。结果表明:固液发动机的燃面呈现显著的非平行退移特征;燃烧室压强对燃面退移不均匀性的影响可忽略;控制燃面退移的主要因素是燃气传向固体燃料表面的热流密度,燃料表面的温度变化是宏观表现。在靠近喷嘴位置,燃面退移的热量传递主要受燃烧反应过程控制,而靠近喷管处燃面退移的热量传递主要受燃气流动过程控制。研究为固液发动机的装药优化设计和高效燃烧组织提供了理论依据。
In order to obtain the control factors and mechanism of the solid fuel surface deglaration of solid-liquid engine, numerical simulation and experimental research are carried out. A two-dimensional axisymmetric calculation model was established. Combustion and flow of fuel and oxidizer were considered. The distribution of temperature, pressure, velocity and composition of the solid-liquid engine was calculated. . The comparison of simulation and experimental results proves the effectiveness of the calculation method. The results show that the combustion surface of solid-liquid engine exhibits a significant non-parallel back-off characteristic; the influence of combustion chamber pressure on the nonuniformity of fuel surface migration is negligible; the main factor controlling the combustion surface back-off is the transfer of gas to the surface of solid fuel Heat flux density, the temperature of the fuel surface is a macro performance. Near the nozzle position, the heat transfer of the combustion surface is mainly controlled by the combustion reaction process, and the heat transfer near the nozzle surface is mainly controlled by the gas flow process. The research provides a theoretical basis for the optimal design of the charge and the efficient combustion of the solid-liquid engine.