不同振动参数下脉动气流横掠圆柱体的传热研究  

Study on Heat Transfer over a Cylinder in Pulsating Flows with Different Vibration Parameters

作　　者：郑友取[1] 李国能[1] 胡桂林[1] 张治国[1] 

机构地区：[1]浙江科技学院新能源与节能技术研究所,杭州310023

出　　处：《动力工程学报》2012年第9期688-692,704,共6页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51106140);浙江省自然科学基金资助项目(Z1110695)

摘　　要：在脉动气流强化传热实验台上进行了层流(雷诺数Re为171)中不同振动参数(频率f分别为15Hz、30Hz、45Hz、59Hz,振幅prms为45～286Pa)下脉动气流横掠高温共烧陶瓷发热管的传热实验研究.结果表明:层流中低频大振幅的脉动气流能显著强化圆柱体的传热过程,相对努塞尔数随着压力振幅的增大而增大,随着脉动频率的增大而减小,最大相对努塞尔数Nur可超过2.55;在Re=171时,脉动气流强化传热的经验公式为Nur=0.268 4+0.586 7prms0.388 3/f 0.317 0,该经验公式的相关系数为R=0.994 1,揭示了脉动气流强化圆柱体传热过程对振动参数的非线性依赖性.To study the influence of vibration parameters on heat transfer over a cylinder with uniform heat flux in laminar pulsating airflows, an experimental study was carried out on a test rig, with a Reynolds number of 171, under conditions of f=15, 30, 45, 59 Hz, pms=45-286 Pa. Results show that the heat transfer can be enhanced obviously in pulsating airflows with low pulsating frequency and large pressure amplitude. The relative Nusselt number increases with rising pressure amplitude and reducing pulsating frequency, which may get up to 2.55. In the case of Re= 171, the empirical formula for heat transfer en- hancement isNux=0.2684＋0.5867pmax^0.388.3/f^0.3170, with the correlation coefficient R = 0. 994 1, indicating a nonlinear relationship between the vibration parameters and heat transfer enhancement.

关 键 词：强化传热 脉动气流 圆柱体 振动参数 

分 类 号：TK2[动力工程及工程热物理—动力机械及工程]