关键词: 综合冷却效率;涡轮导向叶片;流量比;温比;雷诺数;湍流度

Abstract: In order to study the effects of flow parameters on the overall cooling effectiveness of turbine guide vanes, the temperature distribution on the blade surface was measured by infrared thermograph, and the variation of the overall cooling effectiveness with mass flow ratio, temperature ratio, mainstream inlet Reynolds number and turbulence intensity was obtained. During the experiment, the coolant-to-mainstream mass flow ratios were 0.15, 0.18, 0.20, 0.22 and 0.24; the mainstream-to-coolant temperature ratios were 1.4, 1.7, 1.93 and 2.2， the mainstream inlet Reynolds numbers were 1.0×10⁵, 1.1×10⁵, 1.2×10⁵, 1.3×10⁵ and 1.4×10⁵, and the mainstream inlet turbulence intensities were 0.506%, 8.156% and 14.92%, respectively. The results show that the overall cooling effectiveness is the lowest at the leading edge and increases gradually along the flow direction. Increasing the mass flow ratio can significantly improve the overall cooling effectiveness of the blade. When the temperature ratio is 1.93, the overall cooling efficiency increases by 29.3% on average as the mass flow ratio increases from 0.15 to 0.24. The increase of temperature ratio and mainstream inlet turbulence intensity is not conducive to the improvement of the overall cooling effectiveness. When the mass flow rate is 0.20, the overall cooling efficiency decreases by 46.5% and 15.5% on average with the increase of temperature ratio from 1.4 to 2.2 and the turbulence intensity from 0.506% to 14.92%. The mainstream inlet Reynolds number has little effect on the overall cooling effectiveness of the blade.

Key words: Overall cooling effectiveness;Turbine guide vane;Mass flow ratio;Temperature ratio;Reynolds number;Turbulence intensity