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Oblique-mode breakdown in hypersonic and high-enthalpy boundary layers over a blunt cone
- Source :
- Advances in Aerodynamics, Vol 3, Iss 1, Pp 1-15 (2021)
- Publication Year :
- 2021
- Publisher :
- SpringerOpen, 2021.
-
Abstract
- The nonlinear analyses of the hypersonic and high-enthalpy boundary-layer transition had received little attention compared with the widely-studied linear instabilities. In this work, the oblique-mode breakdown, as one of the most available transition mechanisms, is studied using the nonlinear parabolized stability equations (NPSE) with consideration of the thermal-chemical non-equilibrium effects. The flow over a blunt cone is computed at a free-stream Mach-number of 15. The rope-like structures and the spontaneous radiation of sound waves are observed in the schlieren-like picture. It is also illustrated that the disturbances of the species mass and vibrational temperature near the wall are mainly generated by the product term of the wall-normal velocity disturbance and the mean-flow gradient. In comparison to the CPG flow, the TCNE effects destabilize the second mode and push upstream the N factor envelope. The higher growth rate of the oblique wave leads to stronger growth of the streamwise vortices and harmonic waves.
- Subjects :
- Physics
Hypersonic speed
Work (thermodynamics)
Flow (psychology)
Oblique case
TL1-4050
General Medicine
Mechanics
Engineering (General). Civil engineering (General)
High-enthalpy flows
Vortex
Physics::Fluid Dynamics
Nonlinear system
Hypersonics
Boundary-layer transition
TA1-2040
Vibrational temperature
Envelope (waves)
Motor vehicles. Aeronautics. Astronautics
Subjects
Details
- Language :
- English
- ISSN :
- 25246992
- Volume :
- 3
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Advances in Aerodynamics
- Accession number :
- edsair.doi.dedup.....184bcbbc2c6148a34082e147e79a5def