摘要
为了研究气冷涡轮叶片综合冷却效率及其影响因素,采用红外热像仪对叶片表面温度场进行了测量,同时在叶片中截面布置了15支热电偶用于校准红外热像仪的测量结果,获得了叶片表面温度场分布以及流量比、温比和落压比对叶片综合冷却效率的影响规律。实验结果表明:叶片温度场分布受内部冷却和外表面换热共同影响,叶片前缘与叶尖处于较高温度状态;在实验工况内,增加流量比可以有效提高叶片综合冷却效率,流量比从0.02增加到0.07时,平均综合冷却效率从0.426升高到0.645,提高了51.4%;温比对综合冷却效率影响不明显,但大温比可以降低叶片温度;落压比从1.3增加到1.5时,平均综合冷却效率由0.524上升至0.565,升高了7.8%。
In order to study the integrated cooling efficiency of air-cooled turbine blade and its influencing factors,the infrared thermal imager was adopted for the measurement of blade surface temperature field,and 15 thermocouples were set up in the middle section of the turbine blades for calibration,obtaining accurate surface temperature field distribution.The influences of flow ratio,temperature ratio and pressure ratio on the blades inte⁃grated cooling efficiency were thus deduced.The experimental results show that the temperature field distribution of the blade is affected by both internal cooling and external surface heat transfer,with the leading edge and the tip part of blade at a higher temperature state.Under experimental conditions,the integrated cooling efficiency of the blade is effectively improved by increasing the flow ratio.With the flow ratio increases from 0.02 to 0.07,the arc-averaged integrated cooling efficiency rises from 0.426 to 0.645,which means a growth of 51.4%.Although the large temperature ratio can reduce the blade temperature,the temperature ratio is found having no obvious ef⁃fect on the integrated cooling efficiency.When the pressure ratio increases from 1.3 to 1.5,the arc-averaged inte⁃grated cooling efficiency goes up from 0.524 to 0.565,resulting in a 7.8% growth.
作者
钟博
郭昊雁
魏景涛
杨卫华
ZHONG Bo;GUO Hao-yan;WEI Jing-tao;YANG Wei-hua(College of Energy and Power,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Beijing Power Machinery Institute,Beijing 100074,China)
出处
《推进技术》
EI
CAS
CSCD
北大核心
2021年第2期335-343,共9页
Journal of Propulsion Technology
基金
北京动力机械研究所对本研究的资助与支持
关键词
航空发动机
涡轮叶片
气膜冷却
综合冷却效率
红外修正
Aero-engine
Turbine blade
Film cooling
Integrated cooling efficiency
Infrared calibration
