The numerical investigation into the instability of the under-expanded supersonic jets is presented in this paper by solving the axisymmetric N-S equations with the NND finite difference scheme.

• 摘要 应用NND有限差分格式求解轴对称可压缩N-S方程，研究了不同驻室与 环境压力比条件下欠膨胀超声速射流近场的失稳特性.；计算结果表明欠膨胀超声速射流的失 稳机制根据射流激波结构的特征可分为3种失稳模式：具有规则反射激波结构和单一剪切层 特征的射流不稳定性；