000013840 001__ 13840
000013840 005__ 20161115094003.0
000013840 04107 $$aeng
000013840 046__ $$k2016-08-21
000013840 100__ $$aDong, Ming
000013840 24500 $$aEffects of local suction on boundary-layer instability and acoustic radiation

000013840 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000013840 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000013840 506__ $$arestricted
000013840 520__ $$2eng$$aWhen a boundary—layer instability mode propagates through a region of rapid distortion, its amplitude changes substantially while at the same time a sound wave is radiated, both due to the ensuing scattering. This paper focuses particularly on the impact of a local suction on an incident T—S wave by employing a Local Scattering Theory. The central idea is to introduce a transmission coefficient, defined as the ratio of the T—S wave amplitude downstream of the scatter to that upstream. The mathematical description is based on the triple—deck formulism, but in order to accommodate the acoustic field, the unsteady terms in the upper deck are retained. It is found that a suction slot would suppress the oncoming T—S wave. The intensity of the radiated sound increases with the mass flux if the latter is not too large, but is suppressed when the flux exceeds a critical value.

000013840 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013840 653__ $$a

000013840 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000013840 720__ $$aDong, Ming
000013840 8560_ $$ffischerc@itam.cas.cz
000013840 8564_ $$s169781$$uhttps://invenio.itam.cas.cz/record/13840/files/PO.FM02-1.07.73.pdf$$yOriginal version of the author's contribution as presented on CD, XMLout( page 564, code PO.FM02-1.07.73).
000013840 962__ $$r13812
000013840 980__ $$aPAPER