Flow Tones in a Pipeline-Cavity System: Effect of Pipe Asymmetry

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Description

Flow tones in a pipeline-cavity system are characterized in terms of unsteady pressure within the cavity and along the pipe. The reference case corresponds to equal lengths of pipe connected to the inlet and outlet ends of the cavity. Varying degrees of asymmetry of this pipe arrangement are investigated. The asymmetry is achieved by an extension of variable length, which is added to the pipe at the cavity outlet. An extension length as small as a few percent of the acoustic wavelength of the resonant mode can yield a substantial reduction in the pressure amplitude of the flow tone. This ... continued below

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2834 Kilobytes pages

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Erdem, D.; Rockwell, D.; Oshkai, P.L. & Pollack, M. February 28, 2001.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

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  • Lockheed Martin
    Publisher Info: Lockheed Martin Corporation, Schenectady, NY 12301 (United States)
    Place of Publication: Schenectady, New York

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Description

Flow tones in a pipeline-cavity system are characterized in terms of unsteady pressure within the cavity and along the pipe. The reference case corresponds to equal lengths of pipe connected to the inlet and outlet ends of the cavity. Varying degrees of asymmetry of this pipe arrangement are investigated. The asymmetry is achieved by an extension of variable length, which is added to the pipe at the cavity outlet. An extension length as small as a few percent of the acoustic wavelength of the resonant mode can yield a substantial reduction in the pressure amplitude of the flow tone. This amplitude decrease occurs in a similar fashion within both the cavity and the pipe resonator, which indicates that it is a global phenomenon. Furthermore, the decrease of pressure amplitude is closely correlated with a decrease of the Q (quality)-factor of the predominant spectral component of pressure. At a sufficiently large value of extension length, however, the overall form of the pressure spectrum recovers to the form that exists at zero length of the extension. Further insight is provided by variation of the inflow velocity at selected values of extension length. Irrespective of its value, both the magnitude and frequency of the peak pressure exhibit a sequence of resonant-like states. moreover, the maximum attainable magnitude of the peak pressure decreases with increasing extension length.

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2834 Kilobytes pages

Notes

OSTI as DE00821955

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  • Other Information: PBD: 28 Feb 2001

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  • Report No.: LM-01K024
  • Grant Number: AC12-00SN39357
  • DOI: 10.2172/821955 | External Link
  • Office of Scientific & Technical Information Report Number: 821955
  • Archival Resource Key: ark:/67531/metadc787620

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  • February 28, 2001

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  • Dec. 3, 2015, 9:30 a.m.

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  • April 28, 2016, 8:44 p.m.

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Erdem, D.; Rockwell, D.; Oshkai, P.L. & Pollack, M. Flow Tones in a Pipeline-Cavity System: Effect of Pipe Asymmetry, report, February 28, 2001; Schenectady, New York. (digital.library.unt.edu/ark:/67531/metadc787620/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.