燃气轮机旋转状态下的动叶气膜冷却效果数值模拟研究

doi:10.11930/j.issn.1004-9649.201805104

中国电力 ›› 2018, Vol. 51 ›› Issue (12): 7-13,35.DOI: 10.11930/j.issn.1004-9649.201805104

燃气轮机旋转状态下的动叶气膜冷却效果数值模拟研究

李录平, 唐学智, 张浩, 黄章俊

长沙理工大学能源与动力工程学院, 湖南长沙 410014

收稿日期:2018-05-18 修回日期:2018-10-11 出版日期:2018-12-05 发布日期:2018-12-13
作者简介:李录平(1963-),男,教授,博士,研究生导师,从事动力机械状态检测与故障诊断研究,E-mail:cs_liluping@163.com
基金资助:
湖南省自然科学基金项目（2018JJ2442）；中国南方电网有限责任公司科技计划项目（K-GD2014-0583002-002）。

Numerical Simulation Study of Film Cooling Effectiveness on the Rotating Gas-Turbine Blade

LI Luping, TANG Xuezhi, ZHANG Hao, HUANG Zhangjun

School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410014, China

Received:2018-05-18 Revised:2018-10-11 Online:2018-12-05 Published:2018-12-13
Supported by:
This work is supported by Natural Science Foundation of Hunan Province of China (No.2018JJ2442) and Science and Technology Project of China Southern Power Grid (No.K-GD2014-0583002-002).

摘要/Abstract

摘要： 采用数值模拟的方法研究了旋转对叶片气膜冷却效果的影响，详细对比了不同吹风比下叶片在旋转和静止状态下的气膜冷却特性，并用平均气膜冷却效率和不均匀系数评估了气膜冷却效果。结果表明：在叶片压力面，叶片的旋转使得射流气体从气膜孔流出后法向动量增大，与主流掺混作用加强，从而使得叶片压力面气膜冷却效率值低于静止状态；在叶片吸力面，叶片旋转使得冷却气体流出后法向动量减小，能够更好地贴附在叶片表面向下游流动，使得旋转时叶片吸力面气膜冷却效率要优于静止状态，并且叶片后沿的平均气膜冷却效率较静止状态有显著提高；旋转状态下叶片表面的不均匀度系数要略大于静止时叶片表面不均匀度系数。

关键词: 燃气轮机, 旋转, 动叶片, 气膜冷却, 数值模拟, 气膜冷却效果评价

Abstract: In this paper, the film cooling effectiveness of rotating gas turbine blade is investigated through numerical simulations. The cooling characteristics under different blowing ratios in rotating state as well as static state are compared in details. The average film cooling efficiency and cooling non-uniformity coefficient are used to evaluate the film cooling effect. The results show that on the pressure surface of the blade, due to the blade rotation the momentum of the jet cooling air in the normal direction will increase after the airflow passes through the film hole and then intensify with the mix of mainstream, such that the film cooling efficiency on pressure surface is lower than that of the static state. While on suction surface the rotation will result in the decrease of the normal momentum of jet air through the film hole, which will make it remain well attached to the surface and move downstream. Therefore the film cooling efficiency on suction surface is higher than that of the static state, and the average film cooling efficiency on the trailing edge is significantly boosted in comparison with the static state. The cooling non-uniformity coefficient on rotating blade is slightly greater than that of the static blade.

Key words: gas turbine, rotation, moving blade, film cooling, numerical simulation, film cooling effect evaluation

中图分类号:

TK474

李录平, 唐学智, 张浩, 黄章俊. 燃气轮机旋转状态下的动叶气膜冷却效果数值模拟研究[J]. 中国电力, 2018, 51(12): 7-13,35.

LI Luping, TANG Xuezhi, ZHANG Hao, HUANG Zhangjun. Numerical Simulation Study of Film Cooling Effectiveness on the Rotating Gas-Turbine Blade[J]. Electric Power, 2018, 51(12): 7-13,35.

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https://www.electricpower.com.cn/CN/Y2018/V51/I12/7

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燃气轮机旋转状态下的动叶气膜冷却效果数值模拟研究

Numerical Simulation Study of Film Cooling Effectiveness on the Rotating Gas-Turbine Blade

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燃气轮机旋转状态下的动叶气膜冷却效果数值模拟研究

Numerical Simulation Study of Film Cooling Effectiveness on the Rotating Gas-Turbine Blade

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