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Al2O3凝结对固体火箭发动机Al颗粒的燃烧效率及燃气流动有很大影响。结合拉格朗日方法,建立Al2O3凝结模型,分析了在Al2O3烟雾凝结及颗粒自身破碎作用下,不同初始直径Al颗粒的燃烧效率及燃烧室流场的变化规律。计算结果与同条件下的测试数据有较好的吻合,颗粒分布符合相关实验现象。结果表明,小颗粒燃烧后,流场温度及Al2O3烟雾分布均匀;随颗粒初始直径的增加,径向出现明显分层现象;在发动机出口,小颗粒燃烧效率较高,颗粒中Al2O3质量分数较大,但破碎程度较小;随初始直径增加,颗粒燃烧效率逐渐降低,颗粒中仍含有大量未燃烧的Al,破碎程度提高,颗粒数目急剧增加。
Al2O3 coagulation has a great influence on the combustion efficiency and gas flow of Al particles of solid rocket motor. Based on the Lagrange method, the Al 2 O 3 coagulation model was established, and the combustion efficiency and combustion flow field of Al particles with different initial diameters were analyzed under the condensation of Al 2 O 3 and particle self-fragmentation. The calculated results are in good agreement with the test data under the same conditions. The particle distribution accords with the related experimental phenomena. The results show that the temperature of the flow field and the distribution of Al2O3 are uniform after the combustion of the small particles. With the increase of the initial diameter of the particles, obvious radial stratification occurs. At the exit of the engine, the combustion efficiency of the small particles is higher, and the Al2O3 content in the particles is larger , But the degree of crushing is smaller. As the initial diameter increases, the combustion efficiency of the particles gradually decreases, the particles still contain a large amount of unburned Al, the degree of crushing increases, and the number of particles increases sharply.