带凹坑圆孔气膜冷却流动传热特性

王海; 范芳苏; 浦健; 王建华; 刘明侯; 王春华; 陆海鹰

doi:10.13224/j.cnki.jasp.20210174

带凹坑圆孔气膜冷却流动传热特性

doi: 10.13224/j.cnki.jasp.20210174

王海^1,2,
范芳苏³,
浦健¹,
王建华¹,
刘明侯¹,
王春华^3, ,,
陆海鹰⁴

1.
中国科学技术大学热科学和能源工程系，合肥 230027
2.
中国航空发动机集团有限公司沈阳发动机研究所，沈阳 110115
3.
南京航空航天大学能源与动力学院，南京 210016
4.
中国航空发动机集团有限公司中国航空发动机研究院，北京 101304

基金项目: 国家自然科学基金（51706097）

详细信息

作者简介:
王海（1986-），男，博士生，研究方向为航空发动机内流与传热分析。

通讯作者:
王春华（1987-），男，副教授，博士，研究方向为航空发动机热端部件冷却。E-mail：chunhuawang@nuaa.edu.cn

中图分类号: V231.1
计量
- 文章访问数: 145
- HTML浏览量: 19
- PDF量: 80
- 被引次数: 0
出版历程
- 收稿日期: 2021-04-15
- 刊出日期: 2022-03-28

Flow and heat transfer characteristics of round-hole film cooling with crater

1.
Department of Thermal Science and Energy Engineering，University of Science and Technology of China，Hefei 230027，China
2.
Shenyang Engine Research Institute，Aero Engine Corporation of China，Shenyang 110015，China
3.
College of Energy and Power Engineering，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China
4.
Aero Engine Academy of China，Aero Engine Corporation of China，Beijing 101304，China

摘要

摘要: 利用大涡模拟方法对平板带凹坑气膜孔冷气射流与主流的相互作用展开研究，并结合红外热成像壁温测试和粒子图像测速结果进行实验验证，揭示了凹坑对气膜冷却的强化机理。结果表明：凹坑在气膜孔下游诱发反肾型涡对，将冷气向壁面卷吸，改善了气膜贴壁性；与圆孔气膜冷却相似，凹坑气膜冷却流场也出现马蹄涡、发卡涡等大尺度拟序结构，但与圆孔下游的单串列发卡涡不同，凹坑尾缘的“内凹”造型诱发两串并列的发卡涡，且发卡涡结构在大吹风比工况下也较圆孔稳定；脉动信号的频谱分析表明凹坑孔气膜冷却射流周期性弱，流场中低频振荡占主导作用。整体而言，凹坑造型增强了气膜射流的展向扩张，其冷却性能优于圆孔。
- 凹坑孔 /
- 气膜冷却 /
- 大涡模拟（LES） /
- 边界层 /
- 拟序涡
Abstract: The interaction between the mainstream and coolant flow from the crater hole on flat plate was studied by large eddy simulation method，and the film-cooling enhancement mechanism of crater hole was revealed.The simulation results were compared with the experimental results by infrared thermal imaging test and particle image velocimetry.The results showed that the crater hole generated a pair of anti-kidney vortices downstream the coolant exit，promoted the entrainment of coolant towards the wall and improved the coolant coverage.Compared with round hole，large-scaled coherent structures including hairpin vortices and horseshoe vortices can also be observed in crater-hole flow fields.However，different from round-hole，the concave effect on the trailing edge of crater generated parallel lines of hairpin vortices，presenting better stability at high blowing ratio.The time-frequency analysis of pressure fluctuation signals showed that the periodicity of crater-hole film cooling was weaker，and the small-frequency vortices played a dominant role.Overall，crater improved the lateral spreading of coolant jet，and its cooling performance was better than round-hole.
- crater-hole /
- film cooling /
- large eddy simulation（LES） /
- boundary layer /
- coherent vortex

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