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针对前缘设有3排气膜孔的动叶,采用数值模拟方法对其静叶尾迹的非定常特性进行了研究,分析了静叶尾迹对动叶气膜冷却的影响.通过模拟吹风比分别为0.5、1和2时的工况,结合对应工况下的等熵图,对动叶升力系数和阻力系数进行了频谱分析,得到动叶表面的静压分布和传热系数分布.结果表明:随着吹风比的增大,下游叶栅通道的熵值有所减小,尾迹涡脱落频率没有明显变化;动叶压力面静压随着吹风比的增加而降低,压力梯度减小,传热系数则增大,换热增强,冷却效果较好;吸力面静压随着吹风比的增大而逐渐升高,形成了以吸力面最大曲率处为中心的负压区,传热系数增大,但靠近吸力面尾缘部分的换热效果优于前缘部分.
Aiming at the rotor blades with three rows of film holes on the leading edge, the unsteady characteristics of the stator blade wake are studied by numerical simulation and the influence of stator blade wake on the film cooling of the rotor blades is analyzed. For 0.5, 1 and 2 conditions, the lift coefficient and drag coefficient of the moving blade were analyzed by spectrum with the corresponding isentropic diagrams, and the static pressure distribution and heat transfer coefficient distribution of the moving blade surface were obtained. : With the increase of blowing ratio, the entropy of the downstream cascade passage decreases and the wake shedding frequency does not change obviously. The static pressure of the pressure surface of the moving blade decreases with the increase of the blowing ratio, and the pressure gradient decreases The heat coefficient is increased, the heat transfer is enhanced, and the cooling effect is better. The static pressure at the suction surface gradually increases with the blowing ratio increasing, forming a negative pressure zone centered on the maximum curvature of the suction surface. The heat transfer coefficient increases Large, but the heat transfer near the tail of suction side is better than the front part.