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Experiments on a two-dimensional laminar separation bubble
KTH, Superseded Departments, Mechanics.ORCID iD: 0000-0002-1146-3241
2000 (English)In: Philosophical Transactions. Series A: Mathematical, physical, and engineering science, ISSN 1364-503X, E-ISSN 1471-2962, Vol. 358, no 1777, 3193-3205 p.Article in journal (Refereed) Published
Abstract [en]

A two-dimensional separation bubble on a flat plate is studied experimentally by means of hot-wire anemometry and flow visualization. Separation of the laminar boundary layer on the plate is caused by an adverse pressure gradient imposed by a curved wall opposite to the plate. The instability of, and transition process in, the separation bubble are focused on. The bubble is found to be highly susceptible to high-frequency two-dimensional instability waves, which are studied under both natural and forced conditions. A similar development of these instability waves in the separation bubble is found in both cases. The exponential growth of the two-dimensional disturbances dominates the flow except for in the reattachment region, where large-scale three-dimensional structures appear. Some difficulties associated with experimental investigations of boundary-layer separation-bubble flows are discussed.

Place, publisher, year, edition, pages
2000. Vol. 358, no 1777, 3193-3205 p.
Keyword [en]
laminar separation bubbles, instability waves, laminar turbulent transition, reattachment
Identifiers
URN: urn:nbn:se:kth:diva-20252ISI: 000166111500011OAI: oai:DiVA.org:kth-20252DiVA: diva2:338945
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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