论文部分内容阅读
在实验数据验证的基础上,通过三维数值计算的方法,研究了单边膨胀喷管几何参数对其内特性的影响,给出了各模型在不同落压比下的性能参数。计算结果表明:下腹板角度越大,流量系数越小,下腹板向上倾斜模型的流量系数比向下倾斜的模型低了约2%;在低落压比下,上膨胀面长度越短,轴向推力系数越低,其中上膨胀面最短的模型轴向推力系数约为85%;喉道宽高比越大,流量系数越大,喉道宽高比不同,轴向推力系数差别也较大;尾缘有切角,会使喷管后气体更充分地膨胀,下腹板有切角的模型,其推力矢量角较小,其中,下腹板切角较小的模型最大推力矢量角约为12°。
Based on the experimental data, the influence of geometrical parameters of unilateral expansion nozzle on its internal properties was studied by three-dimensional numerical calculation method. The performance parameters of each model under different pressure ratios were given. The results show that the larger the lower web angle is, the smaller the flow coefficient is, and the coefficient of flow coefficient of the downward web inclined upward is about 2% lower than that of the downward sloping model. At lower pressure ratio, The lower the thrust coefficient is, the thrust coefficient of the model with the shortest upper expansion surface is about 85%. The larger the throat aspect ratio is, the larger the flow coefficient is, and the throat aspect ratio is different, and the axial thrust coefficient difference is also larger. The trailing edge has a chamfer angle, which causes the gas in the nozzle to expand more fully. The lower web has a chamfered model with a small thrust vector angle. The maximum thrust vector angle of the lower chamfer angle is about 12 ° .