中文摘要：

通过直接数值模拟的方法，探讨在超音速边界层的转捩问题中，是否存住和不可压缩流情况相似的产生亚谐波的机制．结果表明，三波共振和二次失稳这两种机制都存在．讨论了这两种机制在层流至湍流的转捩中的重要性是否的确很大的问题．

英文摘要：

Direct numerical simulation was done for a supersonic boundary layer, to see if the mechanism for the generation of sub-harmonic waves, similar to those for the incompressible flows, existed in the process of laminar-turboulent transition. The results show that mechanisms of both resonant triad and secondary instability do exist. Discussions were made on whether these two mechanisms are really important in laminar-turbulent transition.