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Chin. Phys. B, 2013, Vol. 22(11): 114703    DOI: 10.1088/1674-1056/22/11/114703
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Imaging of supersonic flow over a double elliptic surface

Zhang Qing-Hu, Yi Shi-He, He Lin, Zhu Yang-Zhu, Chen Zhi
College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
Abstract  The coherent structures of flow over a double elliptic surface are experimentally investigated in a supersonic low-noise wind tunnel at Mach number 3 using nano-tracer planar laser scattering (NPLS) and particle image velocimetry (PIV) techniques. High spatiotemporal resolution images and velocity fields of both laminar and turbulent inflows over the test model are captured. Based on the time-correlation images, the spatial and temporal evolutionary characteristics of the coherent structures are investigated. The flow structures in the NPLS images are in good agreement with the velocity fluctuation fields by PIV. From statistically significant ensembles, spatial correlation analysis of both cases is performed to quantify the mean size and the orientation of coherent structures. The results indicate that the mean structure is elliptical in shape and the structural angles in the separated region of laminar inflow are slightly smaller than that of turbulent inflow. Moreover, the structural angles of both cases increase with their distance away from the wall.
Keywords:  coherent structures      separated flow      spatial correlation analysis      supersonic flow     
Received:  22 January 2013      Published:  28 September 2013
PACS:  47.27.De (Coherent structures)  
  47.32.Ff (Separated flows)  
  47.40.Ki (Supersonic and hypersonic flows)  
  47.80.Cb (Velocity measurements)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11172326), the National Basic Research Program of China (Grant No. 2009CB724100), and the Scientific Research Program of National University of Defense Technology, China (Grant No. 0100010112001).
Corresponding Authors:  He Lin     E-mail:  helin.101sys@gmail.com

Cite this article: 

Zhang Qing-Hu, Yi Shi-He, He Lin, Zhu Yang-Zhu, Chen Zhi Imaging of supersonic flow over a double elliptic surface 2013 Chin. Phys. B 22 114703

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