dc.contributor.author Xiang, X dc.contributor.author Babinsky, H dc.date.accessioned 2019-01-18T00:30:23Z dc.date.available 2019-01-18T00:30:23Z dc.date.issued 2019 dc.identifier.issn 0022-1120 dc.identifier.uri https://www.repository.cam.ac.uk/handle/1810/288141 dc.description.abstract In a rectangular cross-section wind tunnel, a separated oblique shock reflection is set to interact with the turbulent boundary layer (oblique shock wave/turbulent boundary layer interaction (SBLI)) both on the bottom wall and in the corners formed by the intersection of the floor with the sidewalls. To examine how corner separations can affect the ‘quasi-two-dimensional’ main interaction and by what mechanisms this is achieved, an experimental investigation has been conducted. This examines how modifications to the corner separation affect an $M=2.5$ oblique shock reflection. The nature of the flow field is studied using flow visualisation, pressure-sensitive paint and laser Doppler anemometry. The results show that the size and shape of central separation vary considerably when the onset and magnitude of corner separation changes. The primary mechanism explaining the coupling between these separated regions appears to be the generation of compression waves and expansion fans as a result of the displacement effect of the corner separation. This is shown to modify the three-dimensional shock structure and alter the adverse pressure gradient experienced by the tunnel floor boundary layer. It is suggested that a typical oblique SBLI in rectangular channels features several zones depending on the relative position of the corner waves and the main interaction domain. In particular, it has been shown that the position of the corner ‘shock’ crossing point, found by approximating the corner compression waves by a straight line, is a critical factor determining the main separation size and shape. Thus, corner effects can substantially modify the central separation. This can cause significant growth or contraction of the separation length measured along the symmetry line from the nominally two-dimensional baseline value, giving a fivefold increase from the smallest to the largest observed value. Moreover, the shape and flow topology of the centreline separation bubble is also considerably changed by varying corner effects. dc.publisher Cambridge University Press (CUP) dc.title Corner effects for oblique shock wave/turbulent boundary layer interactions in rectangular channels dc.type Article prism.endingPage 1083 prism.publicationDate 2019 prism.publicationName Journal of Fluid Mechanics prism.startingPage 1060 prism.volume 862 dc.identifier.doi 10.17863/CAM.35457 dcterms.dateAccepted 2018-11-09 rioxxterms.versionofrecord 10.1017/jfm.2018.983 rioxxterms.version AM rioxxterms.licenseref.uri http://www.rioxx.net/licenses/all-rights-reserved rioxxterms.licenseref.startdate 2019-03-10 dc.contributor.orcid Babinsky, Holger [0000-0002-7647-7126] dc.identifier.eissn 1469-7645 rioxxterms.type Journal Article/Review cam.issuedOnline 2019-01-16 rioxxterms.freetoread.startdate 2019-07-16
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