Effects of Swirl Ratio and Density Ratio of Slot Jet Flow on the Turbine Endwall Cooling and Suction Surface Phantom Cooling Performance

doi:10.7652/xjtuxb201809013

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Effects of Swirl Ratio and Density Ratio of Slot Jet Flow on the Turbine Endwall Cooling and Suction Surface Phantom Cooling Performance

更新时间：2025-05-01

- Effects of Swirl Ratio and Density Ratio of Slot Jet Flow on the Turbine Endwall Cooling and Suction Surface Phantom Cooling Performance
- Vol. 52, Issue 9, Pages: 95-101+126(2018)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201809013
  CLC： TK474.7
- Online First：10 September 2018，
  
  Published：2018
- 稿件说明：
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Effects of Swirl Ratio and Density Ratio of Slot Jet Flow on the Turbine Endwall Cooling and Suction Surface Phantom Cooling Performance[J]. 2018, 52(9): 95-101+126.
DOI：

Effects of Swirl Ratio and Density Ratio of Slot Jet Flow on the Turbine Endwall Cooling and Suction Surface Phantom Cooling Performance[J]. 2018, 52(9): 95-101+126. DOI： 10.7652/xjtuxb201809013.

摘要

针对上游槽缝射流对涡轮端壁冷却性能影响的问题

同时考虑到涡轮端壁的气膜孔射流和叶栅通道间隙泄漏流同样对端壁及叶片吸力面存在冷却效果

采用数值求解三维Reynolds-Averaged Navier-Stokes(RANS)方程和SST k-ω湍流模型的方法

研究了带预旋上游槽缝射流0.4、0.6、0.8和1.0这4种旋流比和1.0、1.5和2.0这3种密度比对端壁冷却及叶片吸力面泛冷却(二次冷却)性能的影响特性。结果表明:密度比较小时

减小旋流比导致端壁冷却效果降低; 密度比较大时

端壁冷却效果随旋流比减小先降低后升高

最低值出现在旋流比为0.8。随密度比的增加

冷却射流对端壁的冷却效果不断降低

冷却效率最低值随旋流比的增加向下游移动。随旋流比增大

槽缝射流对叶片吸力面泛冷却覆盖面积逐渐减小

位置向下游及靠近端壁的方向发展

泛冷却效率不断降低。随冷却射流密度比的增加

吸力面泛冷却面积显著减小

且向靠近端壁的方向移动

泛冷却效率降低。

Abstract

The effects of four swirl ratios of 0.4

0.6

0.8 and 1.0 and three density ratios of 1.0

1.5 and 2.0 in the upstream slot jet flow with preswirl on the turbine endwall cooling and suction surface phantom cooling performance are numerically investigated using the three-dimensional Reynolds-averaged Navier-Stokes(RANS)equations and the SST turbulent model. The computational model of the turbine endwall taking into account the upstream slot jet flow

the film cooling on the endwall surface and the gap in the cascade passage is taken as the analysis objective. The results indicate that at a low density ratio

decreasing the swirl ratio of the slot jet flow has a negative effect on the endwall cooling effect. At a high density ratio

the cooling effect first decreases and then increases

with the minimum value appearing at the swirl ratio of 0.8. The density ratio has a negative effect on the cooling performance

and the position of the lowest effect moves downstream with the swirl ratio. By reducing the relative motion of the coolant and rotor

the phantom cooling coverage of the slot jet flow becomes smaller and moves downstream

close to the endwall

which results in a lower phantom cooling effect. Increasing the density ratio of the coolant results in a smaller phantom cooling coverage which moves to the endwall

hence reducing the phantom cooling effect on the blade suction surface.

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references

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