沟槽面在湍流减阻中的技术研究及应用进展

针对长输管道中存在的能源消耗问题，分别从湍流边界层流动特性、拟序结构、条带结构、转捩等方面归纳了沟槽面湍流减阻的国内外研究现状，讨论了沟槽的几何形状和尺度、流场压力梯度、沟槽面放置方式对沟槽减阻效能的影响。对沟槽面的减阻机理进行了综述，分析了存在的问题。指出需要利用先进的实验技术如PIV等图像处理手段,并结合计算流体力学软件对湍流边界层的瞬时流场进行研究，以找出沟槽面湍流减阻的机理。数值模拟了在平板中部横向布置的下凹沟槽的流场情况，得到了一种小涡流动结构，同时验证了这种结构在减阻中的作用，阐述了对减阻的另一种认识,并对沟槽面湍流减阻技术及其工业利用进行了展望。

The Technical Research and Application Development of Groove Surface in Turbulent Drag Reduction

Aiming at the energy consumption in long pipeline transportation,the research situation of grooved surface turbulence drag reduction both home and abroad is summarized from the point of view of the characteristics of turbulent boundary layer flow,streak structure and coherent structure,the influence of geometric shape,size, flow field pressure gradient and the way installing groove face on groove drag reduction is discussed,The mechanism of drag reduction of grooved surface is overviewed,the existing problems are analyzed.It is pointed out that the advanced technologies,such as PIV image processing and fluid mechanics software Phoenics and Fluent,should be used to research the instantaneous flow field of turbulent boundary layer to determine the mechanism of grooved surface turbulence drag reduction.The flow field of concave groove transversely placed in flat central section is simulated numerically,and a small whirlpool flow structure is obtained,meanwhile,the function of the structure in drag reduction is verified,a new recognition of drag reduction is stated,too.