Investigations of Film Cooling Effect on Squealer Tip with Plasma Actuation

XU Kewen; HE Kun; YAN Xin

doi:10.7652/xjtuxb202401004

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Investigations of Film Cooling Effect on Squealer Tip with Plasma Actuation

更新时间：2025-05-13

- Investigations of Film Cooling Effect on Squealer Tip with Plasma Actuation
- Vol. 58, Issue 1, Pages: 42-53(2024)
- 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/xjtuxb202401004
  CLC： TK474.7
- Online First：10 January 2024，
  
  Published：2024
- 稿件说明：
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XU Kewen, HE Kun, YAN Xin. Investigations of Film Cooling Effect on Squealer Tip with Plasma Actuation[J]. 2024, 58(1): 42-53.
DOI：

XU Kewen, HE Kun, YAN Xin. Investigations of Film Cooling Effect on Squealer Tip with Plasma Actuation[J]. 2024, 58(1): 42-53. DOI： 10.7652/xjtuxb202401004.

摘要

通过将等离子体激励力耦合至雷诺时均NS方程组的动量方程中

数值研究了等离子体控制下的燃气透平凹槽叶顶的气膜冷却性能

分析等离子体激励强度、激励频率对凹槽叶顶气膜冷却效率和总压损失的影响

提出了一种改善凹槽底部冷却气膜覆盖的非均匀等离子体控制策略

阐明了等离子体激励对叶顶间隙内冷热气流的作用机制。研究结果表明:凹槽下游等离子体激励可有效抑制上游冷气对下游冷气的卷吸

且抑制作用随着激励强度、激励频率的增加而增强。激励强度较小时

上游冷气未对下游冷气造成卷吸

尾缘处气膜冷却性能较好; 随着激励强度增大

尾缘冷气被上游冷气吹离凹槽底部

但中部气膜冷却性能较好。激励强度D

为204时

凹槽底部平均气膜冷却效率相比无激励时提升了25.11%。激励频率与激励强度对叶顶气膜冷却性能的影响规律类似。当激励强度D

为156

激励频率D

为6.25和D

为8.75时

凹槽底部平均气膜冷却效率相比于无激励时分别提升了28.71%和29.27%。施加非均匀等离子体控制时

凹槽底部平均气膜冷却效率比无激励时提升了39.12%。施加等离子体激励后

叶栅总压损失几乎不变。

Abstract

Film cooling performance on a gas turbine squealer tip was numerically investigated by incorporating plasma actuation forces into the momentum equations of Reynolds-averaged Navier-Stokes equations. The objective was to analyze the impact of plasma actuation strength and actuation frequency on the film cooling effectiveness and total pressure loss in tip region. Furthermore

a plasma control strategy was proposed to improve the coolant coverage on the cavity floor of squealer tip

and the mechanism of plasma actuation on the coolant and mainstream in the tip gap was elucidated. The results showed that

the downstream plasma actuation within the squealer cavity effectively counteracts the swirling effect provided by the upstream coolant to the downstream coolant. Such resistant effect is increased with increasing the actuation strength and actuation frequency. When the plasma actuation is minimal

the upstream coolant provides little swirling effect to the downstream coolant in squealer cavity

resulting in effective film cooling effect on the cavity floor near trailing edge. As the actuation strength increases

the coolant near the trailing edge is blown away from the cavity floor by the upstream coolant

but the film cooling effect on the central part of cavity floor becomes better. Compared to the no actuation case

the area-averaged film cooling effectiveness on the cavity floor of squealer tip is increased by 25.11% for actuation strength D

=204. The actuation frequency displays a similar effect on the film cooling at squealer tip as the actuation strength. If the actuation strength is fixed at D

=156

the area-averaged film cooling effectiveness on the cavity floor is increased by 28.71% for actuation frequency D

=6.25 and actuation frequency 29.27% respectively as compared to the no actuation case. Additionally

non-uniform plasma actuation on the squealer tip leads to a 39.12% increase in the area-averaged film cooling effectiveness on the cavity floor compared to the no actuation case. Notably

the total pressure loss in the rotor blade is almost unchanged with the specified plasma excitation.

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