PIV experiments on a rough-wall hypersonic turbulent boundary layer

Dipankar Sahoo, Michael Papageorge, Alexander J. Smits

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Scopus citations

Abstract

In the aerodynamics design of hypersonic vehicles, it is necessary to understand the behavior of turbulence with complex boundary conditions. Surface roughness is one such boundary condition that significantly affects turbulent hypersonic boundary layers. Experiments using Particle Image Velocimetry were performed to study the effects of surface roughness on a hypersonic (M e = 7.3), low Reynolds number (typically Reθ = 5500), turbulent boundary layer. Two different types of roughness elements on a flat plate model were used: diamond mesh and d-type square bars. Two different heights of roughness elements ranging from partially rough (about 38 viscous units) to fully rough (about 136 viscous units) regime with varying roughness density were tested. The van Driest transformed mean velocity profiles for rough walls showed the expected response to roughness, which is the shift of the velocity profile below the standard log-law, without any change in shape. In the region closer to the wall, the streamwise fluctuation was influenced by the size of the diamond mesh roughness. However, the fluctuations were influenced throughout the boundary layer in case of square bar elements. The wall-normal fluctuations indicated no apparent dependence on the size of roughness in case of mesh elements. Some dependence was observed in case of square bars elements. The size and shape of the roughness elements significantly altered the Reynolds shear stress. Also, significant compressibility effects were demonstrated by the roughness elements at this high Mach number.

Original languageEnglish (US)
Title of host publication40th AIAA Fluid Dynamics Conference
StatePublished - Dec 2 2010
Event40th AIAA Fluid Dynamics Conference - Chicago, IL, United States
Duration: Jun 28 2010Jul 1 2010

Publication series

Name40th AIAA Fluid Dynamics Conference

Other

Other40th AIAA Fluid Dynamics Conference
CountryUnited States
CityChicago, IL
Period6/28/107/1/10

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes

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  • Cite this

    Sahoo, D., Papageorge, M., & Smits, A. J. (2010). PIV experiments on a rough-wall hypersonic turbulent boundary layer. In 40th AIAA Fluid Dynamics Conference [2010-4471] (40th AIAA Fluid Dynamics Conference).