Abstract
The present chapter is devoted to the study of acoustical methods of suppression and generation of self-sustained oscillations in wind tunnels with the open test section based on sensitivity of the jet coherent structures to periodical excitation [9.1, 9.6 – 9.8]. The latter are attenuated under high-frequency excitation where the Strouhal number Sts = f s d /u 0 = 2 − 5 and are amplified under low-frequency excitation with Sts = 0.3 − 0.8. The most sensitive jet area to periodical excitation is the thin mixing layer in the immediate vicinity of the nozzle cut-off. Vortex disturbances are generated under acoustical excitation just there determining amplification or attenuation of coherent quasi-periodical structures.
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References
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Ginevsky, A.S., Vlasov, Y.V., Karavosov, R.K. (2004). Acoustical Approaches to Control of Self-Sustained Oscillations in Wind Tunnels with the Open Test Section. In: Acoustic Control of Turbulent Jets. Foundations of Engineering Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-39914-8_9
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DOI: https://doi.org/10.1007/978-3-540-39914-8_9
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