射流、旋流、出流共同作用下矩形通道换热特性

张宗卫; 朱惠人; 赵曙; 郭涛

射流、旋流、出流共同作用下矩形通道换热特性

西北工业大学动力与能源学院,西安 710072

基金项目: 国家重点基础研究发展计划(2007CB707701); 西北工业大学博士论文创新基金

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出版历程
- 收稿日期: 2010-05-29
- 修回日期: 2010-10-28
- 刊出日期: 2011-06-28

Heat transfer characteristics in an internal coolant passage with crossflow-induced swirl, impingement and film cooling holes

School of Power and Energy, Northwestern Polytechnical University,Xi'an 710072,China

摘要

摘要: 在放大模型上详细研究了不同雷诺数和出流比下涡轮叶片内冷通道中冲击靶面、出流面和冲击侧面的换热特性.采用热色液晶瞬态测量技术测量通道内部各个面的传热系数,得到以下结论:靶面直接受到射流的第一次冲击,射流形成旋流对出流面进行第二次冲刷,对冲击侧面进行第三次冲刷;靶面受到冲击孔射流的直接冲击,因此换热最强;冲击侧面只受到旋流、横流影响,因此换热最弱;冲击和旋流是通道各个面换热强化的主要原因;换热随雷诺数的增大而增强.出流比对各个面的换热分布及大小也有一定影响.
- 涡轮 /
- 传热系数 /
- 冲击冷却 /
- 旋流 /
- 液晶
Abstract: The effects of Reynolds number and bleeding ratio on heat transfer of impingement target surface,bleeding-hole surface and impingement channel side surface were investigated in large-scaled test models for the cooling passages in gas turbine blade.A transient liquid crystal technique was used to measure the local heat transfer coefficients of inner surfaces of impingement channel.The results show that,on impingement channel inner surfaces,the main causation of high heat transfer coefficient is caused by the first,second and third impingement,respectively.The average heat transfer coefficient of impingement target surface is the highest on the same Reynolds number by the direct impingement.The average heat transfer coefficient of bleeding-hole surface is higher than channel side surface.The impingement and swirl play a primary role on the Nusselt number of the researched surfaces.The heat transfer was augmented distinctly with increase of Reynolds number.The bleeding ratio also affects the value and distributions of heat transfer coefficients of all inner surfaces.
- turbine /
- heat transfer coefficient /
- impingement cooling /
- swirl /

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参考文献(15)

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