双层壳型冲击/气膜结构内表面换热特性实验

推进技术 ›› 2007, Vol. 28 ›› Issue (3): 235-239.

双层壳型冲击/气膜结构内表面换热特性实验

毛军逵,刘震雄,郭文,江和甫

南京航空航天大学能源与动力学院; 江苏南京210016;南京航空航天大学能源与动力学院; 江苏南京210016;中国燃气涡轮研究院四川成都610500;中国燃气涡轮研究院四川成都610500

发布日期:2021-08-15

Experiment on local heat transfer coefficient of a double-decker jet impingement/gimm cooling structure

Coll.of Energy and Power,Nanjing Univ.of Aeronautics and Astronautics,Nanjing 210016,China;Coll.of Energy and Power,Nanjing Univ.of Aeronautics and Astronautics,Nanjing 210016,China;China Gas Turbine Establishment,chengdu 610500,China;China Gas Turbine Establishment,chengdu 610500,China

Published:2021-08-15

摘要/Abstract

摘要： 以双层壳型冲击/气膜复合冷却结构的平壁模型作为研究对象,进行了该种结构典型冷却单元的放大模型实验研究。通过改变冲击Re数(10 000~40 000),冲击间距和冲击孔直径之比H/D(0.17~2.0),冲击孔和气膜孔间距与冲击孔直径之比P/D(0~5.0)等参数,利用热膜法研究了该典型冷却单元结构中内表面的换热特性。研究结果表明:参数Re,H/D,P/D对内表面局部换热系数的影响呈现出复杂的关联性。在本文的实验工况参数条件下,随着冲击Re数的增加,内表面换热效果逐步增强;并且存在一个最佳的H/D和P/D范围使得内表面换热效果最佳。综合分析实验结果,当H/D=0.67,P/D=3时,双层壳型冲击/气膜冷却结构内表面能达到最佳的换热效果。

关键词: 推进系统;喷射冲击;薄膜冷却;传热系数

Abstract: Experiments were carried out to investigate the heat transfer coefficient on inner surface of a lamellar double-decker jet impingement/film structure.Impingement Reynolds number(10 000～40 000),the ratio of the jet impingement distance to the diameter of the jet hole H/D(0.17～2.0),the ratio of the distance between the jet hole and film hole to the diameter of the jet hole P/D(0～5.0)were changed to study the rules of local heat transfer coefficient varying with these parameters.All the results show impingement Reynolds number,H/D and P/D affected heat transfer on inner surface together and the rules are complex.In experiments,higher heat transfer coefficient was achieved under larger impingement Reynolds number conditions.And there exists a proper range of H/D and P/D,which can result in a maximum heat transfer coefficient.It is verified that when H/D=0.67 and P/D=3,the maximum heat transfer coefficient can be achieved.

Key words: Propulsion system;Jet impingement;Film cooling;Heat transfer coefficient

毛军逵,刘震雄,郭文,江和甫. 双层壳型冲击/气膜结构内表面换热特性实验[J]. 推进技术, 2007, 28(3): 235-239.