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本文将燃气轮机内部冷却通道简化为梯形截面带肋U型通道,采用瞬态热敏液晶技术获得不同雷诺数下通道表面的努塞尔数分布并与RANS和DES数值模拟对比。结果表明,斜置肋片引起的二次流沿程发展导致通道进出口段传热沿程发展,通道截面变化也对传热分布影响较大。DES方法比RANS方法更好地捕捉到了梯形带肋U型通道中的传热分布规律。
In this paper, the gas turbine internal cooling channel is simplified as a trapezoidal cross-section ribbed U-shaped channel. The Nusselt number distribution of the channel surface under different Reynolds numbers is obtained by transient thermal liquid crystal technology and compared with RANS and DES numerical simulation. The results show that the development of the secondary flow along the inclined rib leads to the development of heat transfer along the inlet and outlet of the channel, and the change of the cross section of the channel also has a great influence on the heat transfer distribution. The DES method better captures the heat transfer distribution in the trapezoidal ribbed U-shaped channel than the RANS method.