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Stability of a swirled liquid film entrained by a fast gas stream

Abstract : We study the liquid flow inside a recessed gas-centered swirl coaxial injector, where a swirled liquid flowing against an outer wall is destabilized by a central fast gas stream. We present measurements of the liquid intact length inside the injector, as a function of swirl number and dynamic pressure ratio. We propose a simple model to account for the effect of these parameters.We next study the surface instability inside the injector: its frequency ismeasured for several swirl angles, and as a function of gas velocity. Results are first confronted to the predictions of an inviscid linear stability analysis including swirl, and second to the predictions of a viscous linear stability analysis where swirl is not included. The viscous analysis captures the experimental frequency.
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https://hal.archives-ouvertes.fr/hal-00987576
Contributor : Jean-Philippe Matas Connect in order to contact the contributor
Submitted on : Tuesday, May 6, 2014 - 2:43:19 PM
Last modification on : Thursday, March 10, 2022 - 3:58:07 PM
Long-term archiving on: : Wednesday, August 6, 2014 - 1:00:38 PM

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  • HAL Id : hal-00987576, version 1

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Jean-Philippe Matas, Moongeun Hong, Alain H. Cartellier. Stability of a swirled liquid film entrained by a fast gas stream. Physics of Fluids, American Institute of Physics, 2014, 26, pp.042108. ⟨hal-00987576⟩

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