Study of Generation Mechanism on Discrete Frequency Noise by Digital Image Processing

• KOJIMA Tadatomo

  "Department of Mechanical Systems Engineering, Faculty of Engineering, Kinki University"

• SHIMAZUE Mari

  "Department of Mechanical Systems Engineering, Faculty of Engineering, Kinki University"

• MATSUOKA Yoshihiro

  "Department of Mechanical Engineering, Faculty of Science and Technology, Kinki University"

Bibliographic Information

Other Title

• 214 画像処理による離散周波数騒音の発生機構の解明

Abstract

In this paper, the generation mechanism of jet noise containing discrete frequencies with peaks at a specific frequency was studied by the digital image processing. The flow of subsonic jet issuing from a nozzle with exit divergent angle 20 degrees was photographed by a high-speed video camera included Schlieren device. The phase speed and distance of vortex rings were calculated by the digital image processing. It was clarified that the fundamental frequency of the noise power spectrum was closely related with the separation vortex, and agreed well with the frequencies of vortex rings released from the nozzle.

Journal

• Journal of the Visualization Society of Japan

  Journal of the Visualization Society of Japan 15 (Supplement1), 185-188, 1995

  The Visualization Society of Japan

Details

• CRID: 1390001204618597760
• NII Article ID: 10002673419
• NII Article ID: 130003443056
• NII Book ID: AN10374478
• DOI: 10.3154/jvs.15.supplement1_185
• ISSN: 1884037X
• ISSN: 09164731
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed