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  • 1
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    Acoustic waves in shock tunnels and expansion tubes (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: It is shown that disturbances in shock and expansion tubes can be modelled as lateral acoustic waves. The ratio of sound speed across the driver-test gas interface is shown to govern the quantity of noise in the test gas. Frequency 'focusing' which is fundamental to centered unsteady expansions is discussed and displayed in centerline pitot pressure measurements.
    Keywords: ACOUSTICS
    Type: In: Shock waves; Proceedings of the 18th International Symposium, Sendai, Japan, July 21-26, 1991. Vol. 1 (A93-45451 19-34); p. 697-704.
    Format: text
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  • 2
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    The effect on an acoustic wave as it traverses an unsteady expansion (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The shift in fundamental frequency that occurs in acoustic waves is obtained for waves traversing an unsteady expansion. It is shown analytically that downstream of the unsteady expansion all frequencies approach one of an infinite number of discrete frequencies independent of the frequency upstream of the unsteady expansion. This theoretical analysis is used to accurately predict the period of noise observed in an expansion tube when operated at low enthalpies.
    Keywords: ACOUSTICS
    Type: Physics of Fluids A (ISSN 0899-8213); 3; 717-719
    Format: text
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