Aerodynamic heating in transitional hypersonic boundary layers: Role of second-mode instability

2018 ◽  
Vol 30 (1) ◽  
pp. 011701 ◽  
Author(s):  
Yiding Zhu ◽  
Xi Chen ◽  
Jiezhi Wu ◽  
Shiyi Chen ◽  
Cunbiao Lee ◽  
...  
Keyword(s):  
Boundary Layers ◽  
Aerodynamic Heating ◽  
Mode Instability ◽  
Hypersonic Boundary Layers ◽  
Second Mode

scholarly journals Transition in Hypersonic Boundary Layers: Role of Dilatational Waves

AIAA Journal ◽  
2016 ◽  
Vol 54 (10) ◽  
pp. 3039-3049 ◽  
Author(s):  
Yiding Zhu ◽  
Chuanhong Zhang ◽  
Xi Chen ◽  
Huijing Yuan ◽  
Jiezhi Wu ◽  
...  
Keyword(s):  
Boundary Layers ◽  
Hypersonic Boundary Layers

Direct numerical simulation of transition in a sharp cone boundary layer at Mach 6: fundamental breakdown

2015 ◽  
Vol 768 ◽  
pp. 175-218 ◽  
Author(s):  
Jayahar Sivasubramanian ◽  
Hermann F. Fasel
Keyword(s):  
Boundary Layer ◽  
Boundary Layers ◽  
Nonlinear Interactions ◽  
Fundamental Resonance ◽  
Hypersonic Boundary Layers ◽  
Turbulent Transition ◽  
Breakdown Region ◽  
Complete Breakdown ◽  
Sharp Cone

Direct numerical simulations (DNS) were performed to investigate the laminar–turbulent transition in a boundary layer on a sharp cone with an isothermal wall at Mach 6 and at zero angle of attack. The motivation for this research is to make a contribution towards understanding the nonlinear stages of transition and the final breakdown to turbulence in hypersonic boundary layers. In particular, the role of second-mode fundamental resonance, or (K-type) breakdown, is investigated using high-resolution ‘controlled’ transition simulations. The simulations were carried out for the laboratory conditions of the hypersonic transition experiments conducted at Purdue University. First, several low-resolution simulations were carried out to explore the parameter space for fundamental resonance in order to identify the cases that result in strong nonlinear interactions. Subsequently, based on the results from this study, a set of highly resolved simulations that proceed deep into the turbulent breakdown region have been performed. The nonlinear interactions observed during the breakdown process are discussed in detail in this paper. A detailed description of the flow structures that arise due to these nonlinear interactions is provided and an analysis of the skin friction and heat transfer development during the breakdown is presented. The controlled transition simulations clearly demonstrate that fundamental breakdown may indeed be a viable path to complete breakdown to turbulence in hypersonic cone boundary layers at Mach 6.

Mechanism of stabilization of porous coatings on unstable supersonic mode in hypersonic boundary layers

2021 ◽  
Vol 33 (5) ◽  
pp. 054105
Author(s):  
Tiehan Long ◽  
Ying Dong ◽  
Rui Zhao ◽  
Chihyung Wen
Keyword(s):  
Boundary Layers ◽  
Porous Coatings ◽  
Hypersonic Boundary Layers
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