典型文献
Effects of temperature on drag reduction in a subsonic turbulent boundary layer via micro-blowing array
文献摘要：
A comparative study of two micro-blowing temperature cases has been performed to investigate the characteristics of drag reduction in a subsonic flat-plate flow(where the freestream Mach number is 0.7)by means of Direct Numerical Simulation(DNS).With minute amount of blowing gas injected from a 32×32 array of micro-holes arranged in a staggered pattern,the poros-ity of micro-holes is 23％and the blowing coefficient is 0.125％.The simulation results show that a drag reduction is achieved by micro-blowing,and a lower wall-friction drag can be obtained at a higher blowing temperature.The role of micro-blowing is to redistribute the total kinetic energy in the boundary layer,and the proportion of stream-wise kinetic energy decreases,resulting in the thickened boundary layer.Increasing micro-blowing temperature can accelerate this process and obtain an enhanced drag reduction.Moreover,an explanation of drag reduction by micro-blowing related to the micro-jet vortex clusters is proposed that these micro-jet vortex clusters firmly attached to the wall constitute a stable barrier,which is to prevent the direct contact between the stream-wise vortex and the wall.By Dynamic Mode Decomposition(DMD)from temporal/spatial aspects,it is revealed that small structures in the near-wall region play vital role in the change of turbulent scales.The high-frequency patterns are clearly strengthened,and the low-frequency patterns just maintain but are lifted up.
文献关键词：
中图分类号：
作者姓名：
Lan XIE;Binghua LI;Yang ZHANG;Yao ZHENG;Jianfeng ZOU
作者机构：
Center for Engineering and Scientific Computation,and School of Aeronautics and Astronautics,Zhejiang University,Hangzhou 310027,China
文献出处：
引用格式：
[1]Lan XIE;Binghua LI;Yang ZHANG;Yao ZHENG;Jianfeng ZOU-.Effects of temperature on drag reduction in a subsonic turbulent boundary layer via micro-blowing array)[J].中国航空学报（英文版）,2022(09):174-193
A类：
poros
B类：
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AB值：
0.532131
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