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Measurements with a flow direction boundary-layer probe in a two-dimensional laminar separation bubble
KTH, Superseded Departments, Mechanics.ORCID iD: 0000-0002-1146-3241
2000 (English)In: Experiments in Fluids, ISSN 0723-4864, E-ISSN 1432-1114, Vol. 28, no 3, 236-242 p.Article in journal (Refereed) Published
Abstract [en]

Measurements with a directional sensitive hot-wire probe have been carried out in a two-dimensional laminar separation bubble caused by an adverse pressure gradient. The probe has three parallel, in plane wires and can be traversed in the boundary layer in all spatial directions. The central wire, operated as a conventional hot-wire in CTA mode, and two surrounding resistance wires measure the instantaneous magnitude and direction of the flow, respectively. The probe is calibrated and operated in a similar way as a single hot-wire probe for boundary layer measurements. The frequency response is high enough for measurements of naturally occurring instability waves in the bubble. The flow direction intermittency was measured inside the bubble and regions with reversed flow were mapped out. Prior to reattachment periodical oscillations of the flow direction are found associated with shedding of vortical structures from the bubble.

Place, publisher, year, edition, pages
2000. Vol. 28, no 3, 236-242 p.
Keyword [en]
turbulent
Identifiers
URN: urn:nbn:se:kth:diva-19682ISI: 000086477200005OAI: oai:DiVA.org:kth-19682DiVA: diva2:338374
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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Alfredsson, P. Henrik

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