Structural characteristics of the strong interaction between oblique shock wave and streamwise vortex

Wei, Feng; Liu, Weidong; Wang, Qian-cheng; Zhao, Yunfei; Yang, Rui

doi:10.1063/5.0121587

Cited by 5 publications

(2 citation statements)

References 24 publications

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“…Wei et al. (2022 a ) also showed that shock strength plays the same role as circulation in OSVI experiments. Note that the pressure increase was not larger than that without the vortex, as shown in figure 4.…”

Section: Resultsmentioning

confidence: 90%

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Streamwise vortex breakdown due to the interaction with crossed shock waves

Hiejima

2023

J. Fluid Mech.

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This paper presents a vortex breakdown study due to the interaction between a Batchelor vortex and the crossing of oblique shock waves with Mach numbers of 3.5 and 5.0, favourable for supersonic mixing and combustion, respectively. Numerical simulations were conducted to investigate the effects of the circulation intensity and shock angle on vortex breakdown. The results indicate that a breakdown occurs at the shock angle $\beta \geqslant 45^\circ$ or the vortex circulation $q = 0.32$ , and the configuration is a bubble structure with a recirculation region; most of the breakdowns possess a stagnation point. Furthermore, the structure differs from that of a normal shock wave and vortex interaction because the bubble region is subsonic and does not comprise a normal shock wave on the inside. Additionally, this vortex breakdown shows that the momentum flux on the centreline decreases once at the tip of the bubble owing to a sudden drop in velocity in the subsonic region. In addition, the enstrophy production resulting from vortex stretching and tilting is found to have a significant advantage in the interaction region. Based on these results, the threshold required for a bubble vortex breakdown was theoretically derived as an inequality. The numerical simulation results support the theoretical criterion obtained from the proposed inequality. Therefore, a streamwise vortex breakdown resulting from the interaction between the vortex and intersecting oblique-shocks should be reasonably predicted.

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Section: Resultsmentioning

confidence: 90%

“…They determined that only moderate interactions produce conical shock distortions. Recently, Wei et al (2022a) splendidly captured helical structures downstream in strong OSVI. They found that turbulent mixing drastically increases behind the interaction through nanoparticle-based planar laser scattering technology.…”

Section: Introductionmentioning

confidence: 99%

Streamwise vortex breakdown due to the interaction with crossed shock waves

Hiejima

2023

J. Fluid Mech.

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Amplitude reflections and interaction solutions of linear and nonlinear acoustic waves with hard and soft boundaries

Ishaq

Chen

2022

Physics of Fluids

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In this study, the propagation of a fundamental plane mode in a bifurcated waveguide structure with soft–hard boundaries is analyzed by using the Helmholtz equation. The explicit solution is given to this bifurcated spaced waveguide problem by means of matching the potential across the boundary of continuity. Amplitudes of the reflected field in all those regions have been evaluated, and the energy balance has been derived. We have observed the reflection of the acoustic wave against the wavenumber and shown its variation with the duct width. Convergence of the problem has been shown graphically. In our analysis, we notice that the reflected amplitude decreases as the duct spacing increases; as a result, the acoustic energy will increase as the duct spacing increases. It is expected that our analysis could be helpful to give better understanding of wave reflection in an exhaust duct system. We then reduce the linear acoustic wave equation to the Kadomtsev–Petviashvili (KP) equation. Multiple-periodic wave interaction solutions of the KP nonlinear wave equation are investigated, and the energy transfer mechanism between the primary and higher harmonics is explained, which, to the best of our knowledge, is overlooked.

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Effect of a streamwise vortex on supersonic boundary layer transition

et al. 2023

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Supersonic boundary layer transition induced by a streamwise vortex is experimentally investigated based on the Nanoparticle-based Planar Laser Scattering (NPLS) technology, with an inflow Mach number of 2.7 and a unit Reynolds number of 8.79×106 m-1. Though the vortex is outside the boundary layer, it results in obvious difference of transition position along spanwise direction. On the up-wash side, transition to turbulence is completed in advance compared to the vortex-free case, and transition position moves more upstream as the vortex approaches the wall. Conversely, the transition process on down-wash side is inhibited. The promotion and inhibition effects on transition are found to be induced by the influence of vortex on streak density.

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Structural characteristics of the strong interaction between oblique shock wave and streamwise vortex

Cited by 5 publications

References 24 publications

Streamwise vortex breakdown due to the interaction with crossed shock waves

Streamwise vortex breakdown due to the interaction with crossed shock waves

Amplitude reflections and interaction solutions of linear and nonlinear acoustic waves with hard and soft boundaries

Effect of a streamwise vortex on supersonic boundary layer transition

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