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Title: Effects of bevelled nozzles on standoff shocks in supersonic impinging jets
Authors: Lim, H.D.
New, Tze How
Mariani, Raffaello
Cui, Yi Dan
Keywords: Engineering::Mechanical engineering
Issue Date: 2019
Source: Lim, H., New, T. H., Mariani, R. & Cui, Y. D. (2019). Effects of bevelled nozzles on standoff shocks in supersonic impinging jets. Aerospace Science and Technology, 94, 105371-.
Project: MOE2014-T2-1-002
Journal: Aerospace Science and Technology
Abstract: Moderately under-expanded jets issuing from a circular baseline and two bevelled circular nozzles impinging upon a perpendicular flat plate were experimentally studied. The effects of nozzle-pressure-ratio and separation distance variations on the standoff shock formations were investigated with schlieren visualizations and a visual hull based three-dimensional (3D) shock reconstruction technique to provide deeper insights into their 3D features. Across all flow configurations arising from the different combinations of these parameters, results indicated that the bevelled nozzles are effective in introducing asymmetry to the standoff shock geometries. Depending on the exact flow configuration, standoff shock locations may also undergo significant upstream displacements. In particular, the single-bevelled nozzle produces highly unsteady standoff shocks with asymmetric oscillation amplitudes along both side of the nozzle lip regions. Changes to the standoff shock key characteristics were observed to be sensitive towards the jet shock structures and reflection point modified by the bevelled nozzle exits. In particular, the strength and relative position of the reflection point are identified as the major contributing factors influencing the upstream static pressure distribution of the standoff shock, hence leading to the observed changes in the standoff shock behaviour.
ISSN: 1270-9638
DOI: 10.1016/j.ast.2019.105371
Rights: © 2019 Elsevier Masson SAS. All rights reserved. This paper was published by Elsevier in Aerospace Science and Technology and is made available with permission of Elsevier Masson SAS.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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