Experimental observations of the mixing transition in a shock-accelerated gas curtain
| Autor: | Paul Rightley, Peter Vorobieff, Robert F. Benjamin, R.A. Martin |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Shock wave Millisecond Turbulence Mechanical Engineering Computational Mechanics Perturbation (astronomy) Fluid mechanics Mechanics Condensed Matter Physics Instability Physics::Fluid Dynamics symbols.namesake Wavelet Mach number Mechanics of Materials symbols |
| Zdroj: | Physics of Fluids. 11:186-200 |
| ISSN: | 1089-7666 1070-6631 |
| DOI: | 10.1063/1.869911 |
| Popis: | Richtmyer–Meshkov instability of a thin curtain of heavy gas (SF6) embedded in air and accelerated by a planar shock wave (Mach 1.2) leads to the growth of interfacial perturbations in the curtain and to mixing. Our experiments produce a phenomenological description of the mixing transition and incipient turbulence during the first millisecond after the shock interaction. Growth of scales both larger and smaller than that of initial perturbations is visually observed and quantified by applying a wavelet transform to laser-sheet images of the evolving gas curtain. Histogram and wavelet analyses show an abrupt mixing transition for a multimode initial perturbation that is not apparent for single-mode perturbations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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