Abstract
The flow over a cavity on a plane surface generates under certain conditions self-sustained oscillations. Their cause is generation of an acoustical wave as a result of impact of the mixing layer vortices on the cavity trailing edge. This phenomenon is illustrated by comparison of the velocity pulsations in the mixing layer for two cases: flows over a ledge facing backwards and over a cavity of rectangular section (Fig. 10.1). The pulsation spectrum in the second case contains pronounced discrete components due to acoustical feedback with excitation of self-oscillations [10.3]. A cavity could serve for some frequencies as an acoustical resonator effecting on the nature of self-oscillation excitation [10.8]. As a result, the self-oscillation characteristics are determined by the cavity geometry, the Reynolds and Mach numbers, the flow regime (laminar or turbulent) in the boundary layer in front of the cavity, and the characteristic thickness of this layer.
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Ginevsky, A.S., Vlasov, Y.V., Karavosov, R.K. (2004). Interaction of a Mixing Layer with a Cavity. In: Acoustic Control of Turbulent Jets. Foundations of Engineering Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-39914-8_10
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DOI: https://doi.org/10.1007/978-3-540-39914-8_10
Publisher Name: Springer, Berlin, Heidelberg
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