次声频脉动流横掠圆柱体传热实验研究  

Experimental Study on Heat Transfer of a Cylinder in Pulsating Cross-Flows With Infrasonic Frequency

作　　者：郑友取[1] 李国能[1] 胡桂林[1] 泮国荣[1] 

机构地区：[1]浙江科技学院能源与环境系统工程系,浙江杭州310023

出　　处：《工程热物理学报》2014年第2期342-345,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51106140);浙江省自然科学基金资助项目(No.Z1110695)

摘　　要：为研究次声频脉动流中圆柱体对流换热的特性，搭建了脉动流强化传热实验台架，研究了不同脉动频率（f=6—20Hz）的脉动流横掠圆柱体的对流换热问题，脉动波的有效压力振幅Prms固定为22Pa。结果表明：低频小振幅的脉动流横掠热圆柱体时，对流换热相对努塞尔数随着频率的降低线性增大，最大值可达4．0以上；辐射热流率占总热流率的比例随着频率的降低而呈指数下降。In order to study the characteristics of convection heat transfer of a cylinder in pulsating flows with infrasonic frequency, an experiment setup was built. Convection heat transfer of a cylinder in the pulsating cross-flows was investigated under different pulsating frequencies （f = 6 - 20 Hz） while the effective pressure amplitude （Prms） maintains at 22 Pa. Results found that the relative Nusselt number decreases linearly with the pulsating frequency, and it can be larger than 4.0. In addition, the ratio of radiative heat flux to the total heat flux of the cylinder decreases exponentially with the pulsating frequency.

关 键 词：对流传热 脉动流 次声频 圆柱体 

分 类 号：TK124[动力工程及工程热物理—工程热物理]