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采用气流流场与叶栅温度场耦合求解的数值模拟方法,研究了涡轮冷却叶栅前缘附近有冲击冷却结构时冷却流量变化对叶栅冷却效果的影响。计算结果表明:冷却流量增大,冷却气流射入主流场的穿透能力增强,在卵形涡对的诱导下,高温燃气绕过冷却气体并包围住了冷却气流核心区域,使其远离壁面。同时,冷却气体与主流相互作用发生掺混的能力增强,温度很快升高,对叶栅壁面的气膜保护作用降低;冷却流量增大,主冷却腔和冲击冷却腔内部流速增大,换热效应增强,内壁面冷却气流带走的热量加大。
The numerical simulation method of coupling flow field and cascade temperature field is used to study the influence of cooling flow on the cooling effect of cascade when the impingement cooling structure is near the leading edge of the turbine cooling cascade. The calculation results show that the penetration of the cooling air flow into the main flow field increases when the cooling flow rate increases and the high temperature gas bypasses the cooling gas and surrounds the core area of the cooling airflow away from the wall under the induction of the vortex vortex. At the same time, the ability of the cooling gas to intermingle with the mainstream is enhanced, the temperature rises quickly, and the protective effect of the film on the wall of the cascade decreases. The cooling flow increases, the flow velocity in the main cooling chamber and the impingement cooling chamber increases, Enhanced thermal effects, cooling the inner wall cooling air to take away the heat.