Experiments on a two-dimensional laminar separation bubble
2000 (English)In: Philosophical Transactions. Series A: Mathematical, physical, and engineering science, ISSN 1364-503X, Vol. 358, no 1777, 3193-3205 p.Article in journal (Refereed) Published
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.
laminar separation bubbles, instability waves, laminar turbulent transition, reattachment
IdentifiersURN: urn:nbn:se:kth:diva-20252ISI: 000166111500011OAI: oai:DiVA.org:kth-20252DiVA: diva2:338945
QC 201005252010-08-102010-08-10Bibliographically approved