Parabolized stability analysis of chemically reacting boundary-layer flows in equilibrium conditions. (January 2020)

• Record Type: Journal Article
• Authors: Zanus, Ludovico; Miró, Fernando Miró; Pinna, Fabio
• Other Names: Knight Doyle D guest-editor.; Lipatov Igor guest-editor.
• Is Part Of: Proceedings of the Institution of Mechanical Engineers. Volume 234:Number 1(2020)
• Page Start: 79
• Page End: 95
• Publication Date: 2020-01
• Subjects: Hypersonics -- stability -- boundary layer -- parabolized stability equation -- local thermodynamic equilibrium -- supersonic modes; Aeronautics -- Periodicals; Astronautics -- Periodicals; Airplanes -- Design and construction -- Periodicals; Aerospace industries -- Periodicals; 629.1
• DOI: 10.1177/0954410019839894
• Languages: English
• ISSNs: 0954-4100

Abstract

Stability of self-similar hypersonic flows over a flat plate in local thermodynamic equilibrium is studied by means of linear parabolized stability equations. A spectral collocation numerical method together with a finite-difference-based marching scheme are used to solve the equations, while the gas mixture and transport properties are computed with a table look-up procedure. High-temperature effects are found to destabilize the second-Mack-mode regardless of the adiabatic/isothermal wall condition considered. On the other hand, nonlocal effects show a Mach-dependence influence: stabilizing at lower Mach, while destabilizing at higher ones. Strong oscillations in the growth rate of perturbations in local thermodynamic equilibrium are found to be caused by damped supersonic modes.