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利用表面热膜测量上游尾迹周期性扫掠下某超高负荷低压涡轮叶片吸力面附面层的非定常流动特性.通过热膜测得的准壁面剪切力及其统计参数云图分析了尾迹与附面层的相互作用对分离、转捩及再附过程的影响.实验结果表明:对于低雷诺数Re超高负荷产生较大分离泡的情形,尾迹扫掠对涡轮叶片附面层的发展具有显著影响,能够有效地抑制附面层的流动分离.
The surface thermal film was used to measure the unsteady flow characteristics of the suction layer surface of an ultra-high-load low-pressure turbine blade periodically swept by the upstream wake. The quasi-wall shear force and its statistical parameters of the cloud obtained from the hot film were analyzed. The influence of the interaction of the surface layer on the separation, transfer and reattachment process.The experimental results show that for the case of large separation bubbles under the high Reynolds number Re load, the wake sweep has the effect on the development of the turbine blade attachment layer A significant impact, can effectively inhibit the separation of the flow of separation.