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对非定常环境下动叶气膜冷却的流场进行数值模拟,研究非定常尾迹宽度对气膜冷却效果的影响。结果表明,对于动叶的气膜冷却来说,由非定常尾迹形成的低速区对冷却射流的压制作用减小,使冷却射流更多地进入主流并与其掺混,使得气膜孔下游叶片表面的冷却效果降低。当尾迹宽度增大时,叶片表面气膜冷却效果降低的程度增加。非定常尾迹对压力面上冷却效果的影响大于吸力面。压力面上在第1个冷却孔后面冷却效率降低了15%,而吸力面上的冷却效果变化不是很明显。
The numerical simulation of the flow field of the rotor blade cooling in unsteady environment is carried out to study the influence of unsteady wake width on the cooling effect of the gas film. The results show that for the film cooling of the buckets, the compression effect on the cooling jet decreases with the slow velocity zone formed by the unsteady wake, allowing the cooling jet to more enter into and mix with the mainstream, causing the downstream vane surface The cooling effect is reduced. As the width of the wake increases, the degree of reduction of the film cooling effect on the blade surface increases. Unsteady wake on the cooling effect of the pressure surface is greater than the suction surface. On the pressure side, the cooling efficiency is reduced by 15% behind the first cooling hole, whereas the cooling effect on the suction side is less noticeable.