传热对水边界层流动的影响

本文评述了壁面传热对水边界层流体流动及其阻力的影响,同时分析了加热减阻的应用及其影响因素。传热不仅对层流流动、层流向湍流的转捩以及湍流流动有明显的影响,而且对流动分离以及由分离引起的空化也有显著影响。以热脉冲加热的主动式加热方式既可用来产生和消除边界层的T-S波,也能用来控制边界层的分离。因此,热控制技术可望在控制边界层转捩和分离,减小流动阻力等方面得到应用。

Effects of Heat Transfer on the Boundary Layers Flow in Water

In this papers, the effects of heat transfer from the wall on the boundary layers flow in water and the flowing drag are reviewed. The application of drag reduction by surface heating and the factors effecting its use are analysed. Heat transfer from the wall has an obvious effect not only on the laminar boundary layer flow, laminar to turbulence transition and turbulent boundary layer flow, but also on boundary layer seperation and the cavitation caused by seperation. The active heating or periodic pulsed heating can be used to excite and cancel the T-S waves and also to control the boundary layers seperation. Therefore the application of technique of bounndary layers controlled by surface heating is hopeful in the fields of boundary layers transition delay, seperation control and drag reduction and so on.