Investigation of Unsteady Cooling Performance in a Trailing Edge Cutback Model with Land Extensions

doi:10.7652/xjtuxb202009014

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Investigation of Unsteady Cooling Performance in a Trailing Edge Cutback Model with Land Extensions

更新时间：2025-07-09

- Investigation of Unsteady Cooling Performance in a Trailing Edge Cutback Model with Land Extensions
- Vol. 54, Issue 9, Pages: 128-135(2020)
- 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/xjtuxb202009014
  CLC： TK421
- Online First：10 September 2020，
  
  Published：2020
- 稿件说明：
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Investigation of Unsteady Cooling Performance in a Trailing Edge Cutback Model with Land Extensions[J]. 2020, 54(9): 128-135.
DOI：

Investigation of Unsteady Cooling Performance in a Trailing Edge Cutback Model with Land Extensions[J]. 2020, 54(9): 128-135. DOI： 10.7652/xjtuxb202009014.

摘要

采用DDES(delayed detached eddy simulation)非定常数值求解方法

研究了燃气轮机叶片带肋尾缘开缝模型内非定常流动及气膜冷却特性

分析了3种吹风比(0.2

0.8

1.25)对尾缘开缝模型冷却效率的影响

对比了有、无肋板时尾缘开缝模型内的流动和冷却性能

并利用已有的尾缘开缝流量系数和开缝壁面冷却效率实验数据

验证了非定常数值求解方法的有效性和精度。研究结果表明:采用DDES非定常求解方法可以较好地捕捉尾缘开缝区域的旋涡脱落和涡系运动规律

计算得到的流量系数、壁面冷却效率与实验测量值吻合良好; 流量系数随吹风比的增加而增加

且小吹风比时流量系数增加幅度更明显; 相对于无肋板结构

尾缘开缝区域采用肋板结构时流量系数整体下降5%左右

冷却效率整体上有所提高; 对于无肋板和带肋板两种开缝模型

吹风比对绝热壁面冷却效率影响都很大。当吹风比从0.2增加到0.8时

冷却效率显著增加; 当吹风比增至1.25时

大尺度的旋涡脱落导致冷热气流强烈掺混

冷却效率反而下降。吹风比为1.25时

带肋板结构的开缝模型相比于不带肋板的开缝模型冷却效率的下降程度减小。

Abstract

The transient DDES(delayed detached eddy simulation)methods were adopted to investigate the unsteady fluid flow and film cooling performance in a gas turbine blade with trailing edge cutback and land extensions. The film cooling effectiveness on trailing edge cutback was studied under three different blowing ratios(M=0.2

0.8

1.25). The flow and cooling effects in a trailing edge cutback model with land extensions were compared to that without lands. The reliability and accuracy of the transient numerical methods were validated with the existing experimental data with respect to the discharge coefficients in slot and the cooling effectiveness on cutback surface. The results show that the DDES methods are able to provide reliable predictions for the vortex shedding in trailing edge cutback region and capture the developments of vortices effectively. The computational results of discharge coefficients and cooling effectiveness are in good agreement with the experimental data. The discha

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references

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