Evolution characteristics of subsonic-supersonic mixing layer impinged by shock waves

Ma, Kai; Jiang, Li; Li, Qiang; Liu, Yang; Li, Xin; Ma, Dengke; Ao, Wen

doi:10.1016/j.ast.2020.106150

Cited by 14 publications

(2 citation statements)

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“…We expect that viscous effects will only play a significant role in very specific areas (e.g. regions with high levels of turbulence that may appear ahead of the shock impingement, but whose characteristic scales are smaller than that of the mixing-layer thickness [3]). Viscous effects may be also important in determining the vortex roll-up pattern generated downstream, specially in irregular configurations where additional evolutionary scales are present.…”

Section: A Numerical Implementationmentioning

confidence: 99%

“…Details on the interaction of physical processes are key to the prediction and, most important, to the understanding of these uncommon problems. In particular, high-speed propulsion devices have been studied and developed in the last decades to provide aircraft with the high requisites of thrust and endurance that characterize the aerospace sector [1][2][3]. To this end, various configurations are being considered to design a stable and efficient combustion chamber that can operate at a wide collection of regimes.…”

Section: Introductionmentioning

confidence: 99%

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Specific heat effects in two-dimensional shock refractions

et al. 2021

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Compressible mixtures in supersonic flows are subject to significant temperature changes via shock-waves and expansions, which affect several properties of the flow. Besides the widely-studied variable transport effects such as temperature-dependent viscosity and conductivity, vibrational and rotational molecular energy storage is also modified through the variation of the heat capacity c p and heat capacity ratio γ, specially in hypersonic flows. Changes in the composition of the mixture may also modify its value through the species mass fraction Y α , thereby affecting the compression capacity of the flow. Canonical configurations are studied here to explore their sharply-conditioned mechanical equilibrium under variations of these thermal models. In particular, effects of c p (T, Y α ) and γ(T, Y α ) on the stability of shock-impinged supersonic shear and mixing layers is addressed, on condition that a shock wave is refracted. It is found that the limits defining regular structures are affected (usually broadened out) by the dependence of heat capacities with temperature. Theoretical and high-fidelity numerical simulations exhibit a good agreement in the prediction of regular shock reflections and their post-shock aerothermal properties.

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Section: A Numerical Implementationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%