Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.cja.2018.12.004
Title: Numerical and experimental investigation into hypersonic boundary layer transition induced by roughness elements
Authors: DONG, H.
LIU, S.
GENG, X.
LIU, S.
YANG, L. 
CHENG, K.
Keywords: Boundary layer transition
Direct numerical simulation (DNS)
Hypersonic
Oil-film interferometry
Roughness elements
Issue Date: 2019
Publisher: Chinese Journal of Aeronautics
Citation: DONG, H., LIU, S., GENG, X., LIU, S., YANG, L., CHENG, K. (2019). Numerical and experimental investigation into hypersonic boundary layer transition induced by roughness elements. Chinese Journal of Aeronautics 32 (3) : 559-567. ScholarBank@NUS Repository. https://doi.org/10.1016/j.cja.2018.12.004
Rights: Attribution-NonCommercial-NoDerivatives 4.0 International
Abstract: In this work, the Direct Numerical Simulation (DNS) and Oil-Film Interferometry (OFI) technique are used to investigate the hypersonic boundary layer transition induced by single and double roughness elements at Mach number 5. For single roughness, the DNS results showed that both horseshoe vortices and hairpin vortices caused by shear layer instability can affect the boundary layer instability. The generation of the near-wall unstable structure is the key point of boundary layer transition behind the roughness element. At the downstream of the roughness element, the interaction between horseshoe vortices and hairpin vortices will spread in the spanwise direction. For double roughness elements, the effect of the spacing between roughness elements on the transition is studied. It is found that the case of higher spacing between roughness elements is more effective for inducing transition than the lower one. The interaction between two adjacent roughness elements can suppress the evolution of horseshoe vortices in the downstream and trigger the instability of shear layer. Thus, the transition will be suppressed accordingly. © 2019 Chinese Society of Aeronautics and Astronautics
Source Title: Chinese Journal of Aeronautics
URI: https://scholarbank.nus.edu.sg/handle/10635/212476
ISSN: 1000-9361
DOI: 10.1016/j.cja.2018.12.004
Rights: Attribution-NonCommercial-NoDerivatives 4.0 International
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