if there are high temperature gradient between cool liner and hot liner, compressive plastic strain appear at that transient time, which lead to gas film wall bearing high tensile stress at high temperature . high tensile stress is one of main reasons which destroy combustor 分析表明,起动过程中由于热传导滞后引发的温度梯度可以导致火焰筒气膜唇边在起动瞬间发生较大的压缩塑性应变,进而使得该区域在工作时承受较高水平的拉伸应力,高的拉应力会导致火焰筒萌生裂纹。