摘要
采用耦合传热数值方法开展了X型桁架阵列冷却通道传热特性的数值研究,分析了雷诺数Re(10000~60000)、桁架杆直径比d/D(0.0375~0.075)、桁架杆夹角α(30°~60°)和桁架杆倾角β(15°~45°)对X型桁架通道的固体壁面温度、温度梯度以及通道壁面和桁架杆表面热流量的影响规律。结果表明:桁架杆前端形成的马蹄涡较小,后端形成的马蹄涡较大。高传热区域出现在通道入口区域壁面、桁架杆与壁面的交接位置以及桁架表面。在研究参数范围内,增大Re、d/D、α和β分别使X型桁架冷却通道外壁面平均温度降低了9.78%、2.71%、0.66%和0.34%。最大温度梯度出现在通道壁面和桁架杆端部的交汇处。增大Re和d/D可以改善X型桁架冷却通道的传热均匀性,而增大α和β都会恶化X型桁架冷却通道的传热均匀性。通道壁面热流量占X型桁架冷却通道总热流量的69.38%~80.15%,大约为桁架表面热流量的2.27~3.81倍。
Numerical simulations were carried out to study the heat transfer characteristics of the X-shaped truss array channel by using the coupled heat transfer numerical method.The influences of Reynolds number Re(10000 to 60000),truss rod diameter ratio d/D(0.0375 to 0.075),truss rod included angleα(30°to 60°)and truss rod inclination angleβ(15°to 45°)on the solid wall temperature and temperature gradient as well as the heat flow of channel wall and truss rod surface of X-shaped truss array channels wereanalyzed.The results show that the horseshoe vortex formed at the front end of the truss rod is small,while at the rear end is large.The high heat transfer area appears at the channel wall near the channel entrance,the junction position of the channel wall and the truss rod,and the truss rod surface.Within the range of the research parameters in this study,increasing Re,d/D,αandβdecrease theaverage temperatureof outer wall of the X-shaped truss array channel by 9.78%,2.71%,0.66%and 0.34%,respectively.The maximum temperature gradient appears at the intersection of the channel wall and the truss rod end.Increasing Re and d/D can improve the heat transfer uniformity of the X-shaped truss array channel,while increasingαandβwill deteriorate the heat transfer uniformity of the X-shaped truss array channel.The heat flow of the channel wall accounts for 69.38%to 80.15%of the total heat flow of the X-shaped truss array channel,which is approximately 2.27 to 3.81 times that of the truss rod surface.
作者
席雷
高建民
徐亮
赵振
阮麒成
XI Lei;GAO Jian-min;XU Liang;ZHAO Zhen;RUAN Qi-cheng(State Key Laboratory for Manufacturing Systems Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
出处
《汽轮机技术》
北大核心
2022年第5期341-346,共6页
Turbine Technology
基金
中国博士后科学基金资助项目(No.2021M702573)
国家自然科学基金资助项目(No.51876157)。
关键词
涡轮叶片
桁架阵列
冷却通道
传热特性
数值研究
turbine blade
truss array
cooling channel
heat transfer characteristics
numerical investigation
