This paper addressed the problems of supersonic flow turning at the Laval nozzle outlet and the protection of the confining surface against combustion products. In both cases, the swirl of the near-wall jet plays an active role. In the context of vortex motion, radial pressure gradient emerges, thereby serving as a mechanism for controlling supersonic flow and changing its direction. Furthermore, the swirl near-wall jet can be used independently or in combination with a cooling liquid film for surface protection. As an example, supersonic flow in a conical Laval nozzle with an exhaust into a channel with a small constriction is considered. A swirl near-wall jet is organised at the nozzle outlet. The liquid is either atomised in the jet or delivered as a film along the surface. The liquid film formed at the channel surface as a result of deposition from the gas-droplet near-wall jet, or fed specially, is an effective means to enhance cooling. The structure of the near-wall flow and the efficiency of two-phase cooling are analysed based on available experiments. It is demonstrated that the combined gas and liquid film protection can be calculated as that for the laminar flow regime, and is the ultimate possible.
Author(s)
Details
N.E.
Shishkin
Kutateladze Istitute of Thermophysics, Siberian Branch, Russian
Academy of Sciences, Novosibirsk, Russia.
Please see the book here:- https://doi.org/10.9734/bpi/psniad/v1/5585
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