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采用三维非定常气热耦合模拟的数值方法,对具有冷却结构的单级涡轮进行非定常流动和冷却性能进行研究,通过对非定常流场和固体温度场的分析来探讨冷气对叶片排内流场和固体温度场的影响,指出在非定常状态下,不同的动、静叶相对位置对应不同的气膜出流情况。上游周期性不稳定尾流会造成下游动叶片主流掺入气膜保护层,会造成气膜冷却效率降低。尾迹对叶片前缘的撞击引起瞬间的冲角增大,叶片气动负荷以及温度分布存在一定程度的波动,吸力面前缘受到的干扰更为明显。
The unsteady flow and cooling performance of a single-stage turbine with a cooling structure is studied by the numerical method of three-dimensional unsteady gas-air coupling simulation. By analyzing the unsteady flow field and the solid temperature field, Field and solid temperature field. It is pointed out that the relative positions of different moving and stationary vanes correspond to different outflow of gas film in unsteady state. The periodic instability upstream wake will lead to the mainstream of downstream blades mixed into the film protective layer, will result in reduced film cooling efficiency. The impact of wakes on the leading edge of the blade caused the instantaneous angle of attack to increase, and the aerodynamic load and the temperature distribution of the blade fluctuated to some extent. The interference on the leading edge of the suction surface was more obvious.