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Chin. Phys. B, 2014, Vol. 23(11): 114702    DOI: 10.1088/1674-1056/23/11/114702
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Experimental studies on flow visualization and velocity field of compression ramp with different incoming boundary layers

Wu Yu, Yi Shi-He, He Lin, Chen Zhi, Zhu Yang-Zhu
College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
Abstract  Experimental studies which focus on flow visualization and the velocity field of a supersonic laminar/turbulent flow over a compression ramp were carried out in a Mach 3.0 wind tunnel. Fine flow structures and velocity field structures were obtained via NPLS (nanoparticle-tracer planar laser scattering) and PIV (particle image velocimetry) techniques, time-averaged flow structures were researched, and spatiotemporal evolutions of transient flow structures were analyzed. The flow visualization results indicated that when the ramp angles were 25°, a typical separation occurred in the laminar flow, some typical flow structures such as shock induced by the boundary layer, separation shock, reversed flow and reattachment shock were visible clearly. While a certain extent separation occurred in turbulent flow, the separation region was much smaller. When the ramp angles were 28°, laminar flow separated further, and the separation region expanded evidently, flow structures in the separation region were complex. While a typical separation occurred in turbulent flow, reversed flow structures were significant, flow structures in the separation region were relatively simple. The experimental results of velocity field were corresponding to flow visualization, and the velocity field structures of both compression ramp flows agreed with the flow structures well. There were three layered structures in the U component velocity, and the V component velocity appeared like an oblique “v”. Some differences between these two compression ramp flows can be observed in the velocity profiles of the shear layer and the shearing intensity.
Keywords:  compression ramp      incoming boundary layer      fine flow structure      velocity field  
Received:  27 March 2014      Revised:  27 April 2014      Accepted manuscript online: 
PACS:  47.32.Ef (Rotating and swirling flows)  
  47.80.Jk (Flow visualization and imaging)  
  47.80.Cb (Velocity measurements)  
  47.54.De (Experimental aspects)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11172326 and 11302256).
Corresponding Authors:  He Lin     E-mail:  helin.101sys@gmail.com

Cite this article: 

Wu Yu, Yi Shi-He, He Lin, Chen Zhi, Zhu Yang-Zhu Experimental studies on flow visualization and velocity field of compression ramp with different incoming boundary layers 2014 Chin. Phys. B 23 114702

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