中文摘要：

在高超声速条件下,边界层中气体的温度可能很高,以致气体的比热容不再是常数而与温度有关.这时边界层中的流动稳定性如何是值得研究的问题.采用线性稳定性理论,考虑比热容与温度有关时高超声速可压缩平板边界层的稳定性,并与假定比热容为常值的情况作比较,发现对第一模态和第二模态波的中性曲线、最大增长率都有影响.因此,在高超声速情况下,比热容随温度变化是研究边界层稳定性时必须考虑的一个因素.

英文摘要：

The gas temperature within hypersonic boundary layer flow is so high that the specific heat of gas is no longer a constant but relates with temperature. How variable specific heat to influence on boundary layer flow stability is worth researching. The effect of the variable specific heat on the stability of hypersonic boundary layer flows was studied and compared with the case of the specific heat to be supposed constant,based on the liner stability theory. It is found that the variable specific heat indeed has some effects on the neutral curves of both first-mode and second-mode waves,and on the maximum rate of growth either. Therefore,the relationship between specific heat and temperature should be considered in the study of the stability of the boundary layer.