关键词: 沟槽面, 湍流减阻, 拟序结构, 条带结构, Phoenics, 流场

Abstract: 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.

Key words: grooved surface, turbulence drag reduction, streak structure, coherent structure, Phoenics