The fractal measurement of experimental images of supersonic turbulent mixing layer

作     者：ZHAO YuXin YI ShiHe TIAN LiFeng HE Lin CHENG ZhongYu 

作者机构：College of Aerospace and Material EngineeringNational University of Defense TechnologyChangsha 410073China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2008年第51卷第8期

页      面：1134-1143页

核心收录：

学科分类：08[工学] 080203[工学-机械设计及理论] 0802[工学-机械工程] 

基　　金：the National Natural Science Foundation of China (Grant No. 10672178) 

主　　题：NPLS turbulence mixing layer fractal dimension 

摘      要：Flow visualization of supersonic mixing layer has been studied based on the high spatiotemporal resolution Nano-based Planar Laser Scattering(NPLS) method in SML-1 wind tunnel. The corresponding images distinctly reproduced the flow structure of laminar,transitional and turbulent region,with which the fractal measurement can be implemented. Two methods of measuring fractal dimension were introduced and compared. The fractal dimension of the transitional region and the fully developing turbulence region of supersonic mixing layer were measured based on the box-counting method. In the transitional region,the fractal dimension will increase with turbulent intensity. In the fully developing turbulent region,the fractal dimension will not vary apparently for different flow structures,which em-bodies the self-similarity of supersonic turbulence.