Mechanism of separation hysteresis in curved compression ramp
| Autor: | Ming Fang, Yan-Chao Hu, Wen-Feng Zhou, Gang Wang, Ming-Zhi Tang, Yan-Guang Yang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Fluid Flow and Transfer Processes
Shock wave Physics Mechanical Engineering Computational Mechanics Fluid Dynamics (physics.flu-dyn) FOS: Physical sciences Aerodynamics Mechanics Physics - Fluid Dynamics Condensed Matter Physics Separation process Adverse pressure gradient Boundary layer symbols.namesake Heat flux Mach number Mechanics of Materials symbols Shape factor |
| Popis: | A new spatial-related mechanism is proposed to understand separation hysteresis processes in curved compression ramp (CCR) flows discovered recently (Hu et al. Phy. Fluid, 32(11): 113601, 2020). Two separation hystereses, induced by variations of Mach number and wall temperature, are investigated numerically. The two hystereses indicate that there must exist parameter intervals of Mach number and wall temperature, wherein both attachment and separation states can be established stably. The relationships between the aerodynamic characteristics (including wall friction, pressure and heat flux) and the shock wave configurations in this two hystereses are analyzed. Further, the adverse pressure gradient (APG) Isb(x) induced by the upstream separation process and APG Icw(x) induced by the downstream isentropic compression process are estimated by classic theories. The trend of boundary layer APG resistence Ib(x) is evaluated from the spatial distributions of the physical quantities such as the shape factor and the height of the sound velocity line. With the stable conditions of separation and attachment, a self-consistent mechanism is obtained when Isb, Icw and Ib have appropriate spatial distributions. |
| Databáze: | OpenAIRE |
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