有压力梯度非平行边界层稳定性的研究

STABILITY INVESTIGATION OF NONPARALLEL BOUNDARY LAYERS WITH PRESSURE GRADIENTS

该文从抛物化稳定性方程出发,采用从上游往下游递推的数值方法,对非平行边界层稳定性问题进行了数值计算和分析。为更好反映平板边界层流动的物理特征和本质,该文同时考虑到主流的非平行性和压力梯度的作用。数值计算结果表明,顺压梯度有明显的延缓转捩作用,逆压梯度有较强的不稳定作用。数值结果更接近于实验结果。

Based on parabolized stability equations, the stability of nonparallel boundary layer is calculated and analyzed by using recursion numerical method. The influence of main flow nonparallel and pressure gradients is considered to show the physical characteristics of flat boundary flow. The numerical calculation results show that the favorable pressure gradients have apparent laminar flow control property, and the unfavorable pressure gradients have a strong unstable influence. The numerical results are approximated to experiment results.