Abstract
Results of experimental investigations concerning the interaction between a free air jet and an upstream-moving single pressure pulse (shock wave) are presented. It is shown that depending on the jet Mach number a primary single pulse is converted into a cluster of pressure waves. The number of pressure peaks in the cluster increases with the jet velocity. Frequency analysis of pressure signals indicates furthermore a strong dependence of the spectra on the jet velocity. The transformation of the pressure pulse into a cluster of pressure waves is due to the interaction between the flow and shock inside the jet. As a consequence a “xxx” pattern of pressure waves in the jet core is formed while a cluster of pressure waves is generated outside the jet. The use of the obtained results for explaining the frequency behaviour and feedback mechanism of the self-excited oscillations by the free jet — wall interaction is discussed.
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© 1995 Springer-Verlag Berlin Heidelberg
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Obermeier, F., Selerowicz, W.C. (1995). Interaction Between a Free Gas Jet and an Upstream-Moving Shock Wave. In: Brun, R., Dumitrescu, L.Z. (eds) Shock Waves @ Marseille IV. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-79532-9_56
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DOI: https://doi.org/10.1007/978-3-642-79532-9_56
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-79534-3
Online ISBN: 978-3-642-79532-9
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