The impact of steady blowing from the leading edge of an open cavity flow

Al Haddabi, N. H. H., Kontis, K. and Zare-Behtash, H. (2021) The impact of steady blowing from the leading edge of an open cavity flow. Aerospace, 8(9), 255. (doi: 10.3390/aerospace8090255)

Abstract

Cavity flows occur in a wide range of low-speed applications (Mach number ≤0.3), such as aircraft wheel wells, ground transportation, and pipelines. In the current study, a steady jet is forced from a cavity leading edge at different momentum fluxes (0.11 kg/ms2, 0.44 kg/m·s2, and 0.96 kg/m·s2). The investigation was performed for an open cavity with length to depth ratio of 4 at the Reynolds number based on a cavity depth of approximately 50,000. Particle image velocimetry, surface oil flow visualisation, constant temperature anemometry, and pressure measurements were performed in this investigation. The aim of the jet blowing is to separate the cavity separated shear layer from the recirculation zone to reduce the cavity return flow, and hence stabilise the cavity separated shear layer. It was found that increasing the jet momentum flux causes an increase in the cavity return flow due to the increase in the thickness of the cavity separated shear layer. The study also found that the jet populates the separated shear layer with a large number of small-scale disturbances. These disturbances increase the broad band level of the pressure power spectra and Reynolds shear stress in the cavity separated shear layer. On the other hand, the jet disturbances make the shedding of the large vortical structures more intermittent.

• Item Type: Articles
• Additional Information: We are sincerely grateful for all the support from the technical staff and the colleagues who helped in completing this work. The support of the EPSRC-funded NationalWind Tunnel Facility project (grant EP/L024888/1) is gratefully acknowledged.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Zare-Behtash, Dr Hossein and Kontis, Professor Konstantinos and Al Haddabi, Naser Hamood Hamed
• Authors: Al Haddabi, N. H. H., Kontis, K., and Zare-Behtash, H.
• Subjects: Q Science > Q Science (General); Q Science > QC Physics
• College/School: College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity
• Journal Name: Aerospace
• Publisher: MDPI
• ISSN: 2226-4310
• ISSN (Online): 2226-4310
• Published Online: 09 September 2021
• Copyright Holders: Copyright: © 2021 The Authors
• First Published: First published in Aerospace 8(9): 255
• Publisher Policy: Reproduced in accordance with the publisher copyright policy

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
190699		National Wind Tunnel Facility	Frank Coton	Engineering and Physical Sciences Research Council (EPSRC)	EP/L024888/1	ENG - Aerospace Sciences