低雷诺数对透平叶片间隙泄漏流动影响的研究

孙皓; 薛志恒; 李军; 丰镇平

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低雷诺数对透平叶片间隙泄漏流动影响的研究

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- 低雷诺数对透平叶片间隙泄漏流动影响的研究
- Effects of Low Reynolds Number on Turbine Blade Tip Leakage Flow
- 西安交通大学学报 2010年44卷第3期页码：11-15+31
- 作者机构：
  
  西安交通大学叶轮机械研究所,西安,710049
- 作者简介：
- 基金信息：
  
  : 2009-08-08. 作者简介: 孙皓(1982-),男,博士生;李军(联系人),男,教授. 基金项目: 国家重点基础研究规划(973计划)资助项目(2007CB707705);新世纪优秀人才支持计划资助项目(NCET-07-0699)
- DOI：
  中图分类号： TK474.7
- 网络首发：2010-03-10，
  
  纸质出版：2010
- 稿件说明：
移动端阅览
孙皓, 薛志恒, 李军, 等. 低雷诺数对透平叶片间隙泄漏流动影响的研究[J]. 西安交通大学学报, 2010,44(3):11-15+31.

Effects of Low Reynolds Number on Turbine Blade Tip Leakage Flow[J]. 2010, 44(3): 11-15+31.
孙皓, 薛志恒, 李军, 等. 低雷诺数对透平叶片间隙泄漏流动影响的研究[J]. 西安交通大学学报, 2010,44(3):11-15+31. DOI：

Effects of Low Reynolds Number on Turbine Blade Tip Leakage Flow[J]. 2010, 44(3): 11-15+31. DOI：

摘要

采用预处理方法数值研究了低雷诺数时某小型燃气轮机透平叶栅间隙泄漏流动和气动性能.对比分析了雷诺数从4.40×10

到2.55×10

变化时

带间隙和不带间隙时流场的变化特性

研究了雷诺数对间隙泄漏流的影响

并和相应的实验结果及Denton预测值进行了对比.结果表明:对于间隙存在造成的流动损失

数值模拟结果与实验结果及 Denton的预测值都十分接近

基本上不随着雷诺数的变化而变化; 但是

随着雷诺数的减小

通道涡增强; 间隙泄漏涡在和通道涡的相互作用中

强度减弱

在叶栅出口处的位置更加靠近中叶展; 出口处的总压损失和气流角的分布也由于间隙泄漏涡强度和位置的变化而发生改变.

Abstract

The flow field of a small gas turbine cascade was numerically simulated with the preconditioning method at low Reynolds number varying from 4.40×10

to 2.55×10

. Both the cases with and without tip clearance were considered in the simulation. The numerical results of the loss caused by the tip clearance agree well with the experimental data and the values predicted by the Denton formula. It is indicated that this loss will not change with the increase of the Reynolds number but the intensity of the passage vortex increases with the decrease of the Reynolds number. The tip leakage flow will weaken with the increase of the passage vortex because of the interaction between the passage vortex and the tip leakage vortex

and the position of the tip leakage vortex is more close to the middle of the passage. In addition

the distributions of the total pressure loss and the

flow angle at the exit of the cascade are influenced by the intensity and the position of the tip leakage vortex.

关键词

Keywords

references

SJOLANDER S A, AMRUD K K. Effects of tip clearance on blade loading in a planar cascade of turbine blades [J]. ASME Journal of Turbomachinery, 1987, 109(2):237-244.

HEYES F J G, HODSONH P, DAILEY G M. The Effect of blade tip geometry on the tip leakage flow in axial turbine cascade[J]. ASME Journal of Turbomachinery, 1992,114(4):643-651.

YARAS M I, SJOLANDER S A. Effects of simulated rotation on tip leakage in a planar cascade of turbine blades: tip gap flow [J]. ASME Journal of Turbomachinery, 1991, 114(3):652-659.

YAMAMOTO A. Endwall flow and loss mechanisms in a linear turbine cascade with blade tip clearance [J]. ASME Journal of Turbomachinery, 1989, 111(2): 264-274.

祁明旭,丰镇平. 透平动叶顶部间隙流的表现形式及其对透平性能的影响 [J]. 西安交通大学学报,2005, 39(3):243-246.

QI Mingxu, FENG Zhenping. Representation formation of tip clearance flow and influence on turbine performance [J]. Journal of Xi'an Jiaotong University, 2005,39(3):243-246.

MATSUNUMA T. Effects of Reynolds number and free-stream turbulence on turbine tip clearance flow [C/CD]∥ Proceedings of the ASME Turbo Expo. New York: ASME, 2005: GT2005-68009.

DENTON J D. Loss mechanism in turbomachines [J]. ASME Journal of Turbomachinery, 1993, 115(4):621-626.

DENTON J D. Axial turbine aerodynamic design [M]. Cambridge, UK: Cambridge University. Mechanical Engineering Department, 2004:22.

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