| The fractal measurement of experimental images of supersonic turbulent mixing layer |
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| 作者单位： | ZHAO YuXin，YI ShiHe，TIAN LiFeng，HE Lin & CHENG ZhongYu College of Aerospace and Material Engineering，National University of Defense Technology，Changsha 410073，China |
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| 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.
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The fractal measurement of experimental images of supersonic turbulent mixing layer |
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| ZHAO YuXin,YI ShiHe,TIAN LiFeng,HE Lin , CHENG ZhongYu College of Aerospace and Material Engineering,National University of Defense Technology,Changsha ,China. The fractal measurement of experimental images of supersonic turbulent mixing layer[J]. Science in China(Physics Astronomy), 2008, 51(8): 1134-1143. DOI: 10.1007/s11433-008-0097-3 |
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| Authors: | ZHAO YuXin YI ShiHe TIAN LiFeng HE Lin & CHENG ZhongYu College of Aerospace Material Engineering National University of Defense Technology Changsha China |
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| Affiliation: | (1) College of Aerospace and Material Engineering, National University of Defense Technology, Changsha, 410073, China |
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| Abstract: | 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 embodies the self-similarity of supersonic turbulence. Supported by the National Natural Science Foundation of China (Grant No. 10672178) |
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| Keywords: | NPLS turbulence mixing layer fractal dimension |
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