Action of gas-permeable materials of varied porosity on the supersonic
separated flow over a forward-facing step
B.V. Postnikov, K.A. Lomanovich, and R.A. Ponomarenko
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
E-mail: boris@itam.nsc.ru
Keywords: supersonic flow, shock waves, separated flow, porosity, surface step
Pages: 191–197
Abstract
Results of an experimental and numerical study of a supersonic flow over a model forward-facing step with a gas-permeable insert of variable porosity installed upstream of the step are reported. The free-stream Mach number was M = 2.0, 2.5, and 3.0, and the Reynolds number, Re = 5·105. The gas-permeable insert was either a section of a perforated plate or a section of a highly porous permeable cellular material. The flow visualization performed using the shadow method, PIV, and a soot-oil film has shown that the characteristic size of the vortical flow region exhibited a profound decrease on increasing the insert porosity. In numerical calculations performed at high values of that porosity, data on the displacement of the recirculation flow region into the porous material were obtained.
DOI: 10.1134/S086986431802004X
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