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燃气轮机高温透平内部冷却通道中弯头、肋片和气膜孔之间存在着复杂的交互作用。本文采用瞬态液晶技术对光滑通道、无抽吸的带肋通道和有气膜孔抽吸的带肋通道的表面传热分布和沿程压力损失进行了详细测量,同时采用RANS数值模拟方法研究其流场特性。结果表明180°弯头产生的大分离是压力损失的主要因素,45°斜肋片产生的螺旋形流动在弯头与大分离交互作用明显,气膜孔抽吸破坏孔附近边界层使得肋间传热而相对集中于孔附近。在13%抽吸量条件下,气膜孔抽吸降低U型通道中压力损失约20%,同时保持传热强化程度与无抽吸工况相同。
There is a complex interaction between elbows, fins and film holes in the internal cooling passages of the HT turbine. In this paper, the transient heat transfer liquid crystal technology is used to measure the surface heat transfer distribution and the pressure drop along the smooth channel, the ribbed channel without suction, the ribbed channel with gas film hole suction, and the RANS numerical simulation method Its flow field characteristics. The results show that the large separation caused by 180 ° elbow is the main factor of pressure loss. The helical flow produced by 45 ° oblique fins interacts sharply with the large separation in the elbow. The suction of the film hole damages the boundary layer near the hole, Heat is relatively concentrated near the hole. At 13% aspiration, gas-film pore suction reduces the pressure loss in the U-channel by about 20% while maintaining the same degree of heat transfer enhancement as the non-aspiration condition.