湍流强化传热反馈控制机理  

Feedback Control Mechanism for Turbulent Heat Transfer Enhancement

作　　者：潘利生[1] 史维秀[1] 汪健生[1] 

机构地区：[1]天津大学机械工程学院,天津300072

出　　处：《天津大学学报》2011年第7期655-658,共4页Journal of Tianjin University(Science and Technology)

基　　金：国家自然科学基金资助项目(50976079);国家高技术研究发展计划(863计划)资助项目(2009AA05Z431)

摘　　要：对流换热与湍流结构密切相关,运用大涡模拟方法,在湍流流场中进行强化传热反馈控制,分别采用3种反馈控制速度,研究反馈控制对传热的影响机理和效果,并建立目标函数,研究平均强化传热效果.结果表明:在湍流流场中输入适当反馈控制,强化传热效果明显;当α为5.0、10.0和15.0时,努塞尔数最大增幅分别为8.78%、11.17%和14.08%,平均增幅分别为4.80%、6.88%和9.09%;当α为15.0时,y+=5处流场温度比未输入反馈控制的流场高10,℃左右.Convective heat transfer is closely related to turbulence structure.Using large eddy simulation（LES）,feedback control was executed in turbulent flow field with three kinds of control velocities,mechanism and effect of feedback control upon heat transfer were studied,and an objective function was established to study the average ef-fect on heat transfer enhancement.The results show that,inputting feedback control in turbulent flow field,the heat transfer is enhanced remarkably.When α is 5.0,10.0 and 15.0,the largest enhancements of Nusselt number are 8.78%,11.17% and 14.08%,respectively,and the averages of which are 4.80%,6.88% and 9.09% respectively.When α is 15.0,the highest temperature is about 10 ℃ higher than that without control at y＋=5.

关 键 词：反馈控制 强化传热 大涡模拟 湍流拟序结构 

分 类 号：TK124[动力工程及工程热物理—工程热物理]