A Study on the Improvement of Noise Suppression in a Low-Noise Valve of the Multihole Type. 1st Report. Noise Reduction from Multiple Supersonic Parallel-Flow Jets

Masami Nakano, Kiyohiro Tajima, Kenji Kumaido

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The acoustic characteristics of multiple supersonic jets discharged through a multihole plate have been studied over a range of pressure ratio up to 7, for the purpose of understanding the noise suppression mechanisms and developing acoustically improved multihole valve trim. The effects of multihole configuration (hole size, number of jets, and lateral spacing between holes), are investigated in close relation to the flow behavior by far-and near-field noise measurements and schlieren photography. The acoustic efficiency η, is found to decrease in a power law correlation to the diameter of small hole, and with an increase in the number of jets at high pressure ratios. These trends are discussed from the viewpoint of the noise spectrum modification and an acoustic shielding concept. The lateral spacing mainly affects the relatively low-frequency noise radiating from the downstream merged jet.

Original languageEnglish
Pages (from-to)907-916
Number of pages10
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Volume54
Issue number500
DOIs
Publication statusPublished - 1988
Externally publishedYes

Keywords

  • Acoustic Shielding
  • Flow Behavior
  • Fluid Machine Element
  • Low-noise Valve
  • Multihole Trim
  • Multiple Supersonic Jets
  • Noise Spectrum Modification
  • Noise Suppression Mechanisms

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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