摘要
为提高涡轮叶片中弦区的冷却效果,提出了一种力学性能优异、导热和对流传热性能均优良的X型桁架阵列结构,并填充于叶片中弦区内冷通道之中。采用耦合传热数值方法开展了X型桁架阵列冷却通道的数值模拟研究,分析了雷诺数(Re为10000~60000)、桁架杆直径比(d/D为0.0375~0.075)、桁架杆夹角(α为30°~60°)和桁架杆倾角(β为15°~45°)对X型桁架阵列通道流动和传热性能的影响规律,拟合得到了有关X型桁架阵列通道流动和传热性能的经验关联式。研究结果表明:X型桁架通道的摩擦系数随雷诺数Re的增大以及桁架杆直径比d/D和夹角α的减小而降低,随倾角β的增大而先提高后又降低;在研究参数范围内,桁架杆表面平均努塞尔数大约是通道壁面平均努塞尔数的2.32~4.41倍;增大Re、d/D、α和β使得X型桁架阵列通道的整体平均努塞尔数有效提高;减小Re和d/D、增大α和β,使得X型桁架阵列通道的基于整体平均努塞尔数的综合热力系数有效提高。
An X-type truss array structure with excellent mechanical properties,good heat conduction and convective heat transfer performance is proposed to improve the cooling effect in the central chord area of turbine blades and to be filled into the cooling channel in the central chord area of turbine blade.Numerical simulations of X-type truss array cooling channel are carried out by using the coupled heat transfer numerical method.The influences of Reynolds number(Re from 10000 to 60000),diameter ratios of truss rods(d/D from 0.0375 to 0.075),intersection angles of truss rods(αfrom 30°to 60°)and inclination angles of truss rod(βfrom 15°to 45°)on the flow and heat transfer performance of X-type truss array channel are analyzed.The empirical correlations for the flow and heat transfer performance of X-type truss array channel are obtained by fitting.Results show that the friction coefficient of X-type truss array channel decreases with the increase of Reynolds number Re,and the decrease of diameter ratio d/D and intersection angleα,and increases first and then decreases with the increase of inclination angleβ.Within the ranges of the study parameters,the average Nusselt number on the truss rod surfaces is about 2.32 to 4.41 times of that on the channel walls;Increasing Re,d/D,αandβeffectively increases the overall average Nusselt number of X-type truss array channel.Reducing Re and d/D and increasingαandβeffectively increase the comprehensive thermal coefficients based on the overall average Nusselt number of X-type truss array channel.
作者
席雷
徐亮
高建民
赵振
李云龙
XI Lei;XU Liang;GAO Jianmin;ZHAO Zhen;LI Yunlong(State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2021年第8期101-110,共10页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(51876157)
陕西省自然科学基金资助项目(2019JM-096)。
关键词
涡轮叶片
桁架阵列
冷却通道
流动
传热性能
turbine blade
truss array
cooling channel
flow
heat transfer performance
