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利用气固耦合换热方法,对具有热障涂层(TBC)的、高度一体化的一级透平导向叶片的流动和换热特性进行了数值研究。结果表明:在接近真实透平高温高压运行的环境下,TBC对于叶栅通道的气动特性影响可以忽略不计;在冷气流量被减少的情况下,TBC在叶片前缘依然可以明显降低叶片金属表面温度和传热系数;但是,随着冷气流量的减少,TBC的作用在压力面尾缘急剧下降,在吸力面尾缘缓慢下降。对3个高度截面的平均金属温度定量比较得出:在同等冷却效率的条件下,厚度为0.15mm的TBC可以节约20%~30%的冷气流量。
A numerical study of the flow and heat transfer characteristics of a highly integrated first stage turbine guide vane with a thermal barrier coating (TBC) was performed using a gas-solid coupling heat transfer method. The results show that TBC has negligible effect on the aerodynamic characteristics of the cascade duct near the true high temperature and pressure conditions of the turbine. When the flow rate of the cold air is reduced, the TBC at the blade front can still reduce the blade metal surface temperature And the heat transfer coefficient. However, with the decrease of air-conditioning flow, the effect of TBC decreases sharply at the trailing edge of the pressure surface and slowly decreases at the trailing edge of the suction surface. A quantitative comparison of average metal temperatures at three height sections shows that a TBC with a thickness of 0.15 mm can save 20% to 30% of the cooling air flow at the same cooling efficiency.