The fractal measurement of experimental images of supersonic turbulent mixing layer

• 来源期刊: 中国科学G辑（英文版）
• 年，卷（期）: 2008,（8）
• 页码范围: 1134-1143
• 页数: 10页
• 语种: 英文
• DOI: 10.1007/s11433-008-0097-3

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 meas-urement can be implemented. Two methods of measuring fractal dimension wereintroduced 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.