摘要
为深入了解旋转作用力对涡轮叶片多段连接通道换热特征的影响,采用三维数值模拟方法研究了多段连接内通道模型的流动换热。选取通道入口雷诺数为17 000、旋转数范围为0~0.09,多段连接通道3个出口的质量流量比例为25%、50%、25%,旋转半径与水力直径之比的范围为0~69.6,研究了旋转数、旋转半径对各段通道带肋壁面换热分布的影响。结果表明：旋转附加力造成径向出流通道沿程压力系数逐渐增大,径向入流通道的沿程压力系数迅速减小;径向出流通道后缘面的换热系数随旋转数增加而增大,径向入流通道后缘面的换热系数随旋转数增加而稍有减小,旋转作用对前缘面换热的影响情况与后缘面的情况相反;前、后缘面的换热系数沿流向均随旋转半径与水力直径比的增加稍有增大,换热增大幅度较小。
To better understand the effect of rotation on the heat transfer characteristics of internal channels,the flow and heat transfer in an internal channel with 90° ribs are investigated using three-dimensional numerical simulation method. The Reynolds number of channel inlet is 17 000,and the mass flow rates of three outlets are 25%,50%,and 25%,respectively. The rotating number and the hydraulic diameter divided by radius of gyration range from 0 to 0. 09 and 0 to 69. 6,respectively. The influences of rotation number and radius of gyration on heat transfer coefficient are achieved. Results show that the pressure coefficient increases along radial outflow and decreases along radial inflow due to rotational force. In the trailing surface,Nusselt number（ Nu） in radial outflow passages increases and Nu number in radial inflow passage decreases with the augment of the rotation number. The variation of Nu in the leading surface is contrary to that of the trailing surface. The Nu numbers along the flow direction in trailing and leading surfaces are slightly enhanced when the ratio of gyration radius to hydraulic diameter increases. The surface heat transfer coefficient is affected by the variable radius of gyration.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2016年第3期518-524,共7页
Acta Armamentarii
基金
国家自然科学基金项目(51575420)
陕西省自然科学基金项目(2014JM2-5069)
西安市技术转移促进工程-产学研合作重大项目(CXY1518(2))
关键词
航空航天科学技术基础学科
带肋通道
旋转
对流传热
数值模拟
压力系数
basic disciplines of aerospace and technology
ribbed channel
rotating
convective heat transfer
numerical simulation
pressure coefficient
作者简介
李祥阳（1972-），男，讲师。E-mail：lxyqyl@163．com
