工况参数对X型桁架阵列通道流动与传热性能影响的数值研究  

Numerical Study on the Effect of Working Condition Parameters on Flow and Heat Transfer Performance of X-Shaped Truss Array Channel

作　　者：席雷 高源 高建民[1] 徐亮[1] 赵振[1] 李云龙[1] Xi Lei;Gao Yuan;Gao Jianmin;Xu Liang;Zhao Zhen;Li Yunlong(State Key Laboratory for Manufacturing Systems Engineering,Xi an Jiaotong University,Xi an 710049,China)

机构地区：[1]西安交通大学机械制造系统工程国家重点实验室,西安710049

出　　处：《燃气轮机技术》2023年第2期1-6,43,共7页Gas Turbine Technology

基　　金：陕西省自然科学基础研究计划青年项目(2022JQ-545);中国博士后科学基金资助项目(2021M702573)。

摘　　要：针对不同工况参数下桁架阵列通道冷却性能优劣的问题,采用数值方法模拟了X型桁架阵列通道内的流动与传热特性,分析了不同雷诺数下入口湍流度和壁面热流密度对X型桁架阵列通道流动与传热性能的影响规律。结果表明:入口湍流度从5%增大到15%时,通道摩擦系数增大了1.69%~3.23%,通道平均努塞尔数提高了2.47%~2.57%;壁面热流密度从3 000 W·m^(-2)增大到10 000 W·m^(-2)时,通道摩擦系数增大了3.39%~6.45%,通道平均努塞尔数降低了11.14%~17.44%。随着雷诺数的增大,入口湍流度和壁面热流密度对通道流动与传热性能的影响程度都有所减弱。增大入口湍流度可以较小幅度地提升通道的综合热力性能,增大壁面热流密度则会降低通道的综合热力性能。Aiming to understand the cooling performance of truss array channel under different operating conditions,the flow and heat transfer characteristics in the X-shaped truss array channel were simulated by numerical method.The influence laws of inlet turbulence intensity and wall heat flux on the flow and heat transfer performance of the X-shaped truss array channel under different Reynolds numbers were analyzed.The results show that when the inlet turbulence intensity increases from 5%to 15%,the friction coefficient of the channel increases by 1.69%to 3.23%,and the average Nusselt number of the channel increases by 2.47%to 2.57%.When the wall heat flux increases from 3000 W·m^(-2) to 10000 W·m^(-2),the friction coefficient of the channel increases by 3.39%to 6.45%,and the average Nusselt number of the channel decreases by 11.14%to 17.44%.With the increase of Reynolds number,the effects of inlet turbulence intensity and wall heat flux on the flow and heat transfer performance of the channel are weakened.Increasing the inlet turbulence intensity can slightly improve the comprehensive thermal performance of the channel,while increasing the wall heat flux can reduce the comprehensive thermal performance of the channel.

关 键 词：工况参数 桁架阵列通道 流动性能 传热性能 数值研究 

分 类 号：TK472[动力工程及工程热物理—动力机械及工程]