摘要
依据近壁湍流结构及主要特征,提出三种改变流体传热与流动特性的主动控制模式,即顺流下扫模式、逆流下扫模式和垂直下扫模式。对实施主动控制的矩形槽道中的流体流动与传热特性进行数值模拟,并对三种主动控制模式与流体流动、传热间的相互作用进行分析。数值模拟的结果表明,顺流下扫控制模式可以较好地抑制近壁流体的喷出,改善流体的流动与传热特性。与另两种控制模式相比,顺流下扫模式具有最优传热与流动特性。其余两种控制模式虽然也有一定的强化传热与流动减阻效果,但传热与流动综合系数与未施加主动控制模式的空槽道相比提高很小。
Three active control strategies including the control strategy,with downstream and sweep feature,with upstream and sweep feature,with vertical and sweep feature that could change the characteristics of fluid flow and heat transfer are proposed based on the main feature of turbulent structure near wall.The characteristics of flow and heat transfer in a rectangle channel with active control strategy are simulated with numerical method.The interaction law of the three control strategies on fluid flow and heat transfer is investigated.The numerical simulation results show that the control strategy,with downstream and sweep feature,could restrain the fluid ejection from the wall and improve the characteristics of fluid flow and heat transfer.Compared with other two control strategies,the control strategy,with downstream and sweep feature,have the best performance of flow and heat transfer.Although the other control strategies are effective for heat transfer enhancement and drag reduction in some degrees,the synthesis coefficient of heat transfer and flow is enhanced little compared with the channel without the control strategy applied.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2011年第24期104-110,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(50476063)
关键词
湍流结构
控制模式
数值模拟
流动特性
传热
Turbulent structure
Control strategy
Numerical simulation
Flow characteristic
Heat transfer
