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Near-field acoustic characteristics of screech jet exhausted from a nozzle with a hard reflecting plate

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Abstract

The standing wave in the near field of the screech jet exhausted from a nozzle with a hard plate works on the jet flow as the forcing wave by the location of a reflecting plate, and then jet flow is considered to be changed. Moreover, the reflector location from the nozzle changes the sound pressure contours of the near field. Intensity maps of the screech tone which indicate the propagation to the jet axial direction or the radial direction of the jet by the presence of the reflector plate have not been explored. In the present paper, acoustic characteristics in the near field of the screech tone with the reflecting plate are studied using an optical wave microphone, which can measure the sound propagating for both vertical and horizontal directions to the jet axis. As a result, the standing wave in the near field of the screech jet with the reflector has two types: One is the standing wave between the hydrodynamic pressure fluctuation propagating jet downstream and the sound pressure propagating upstream, and the other is the standing wave by the difference between the wavelength of the sound wave and the wavelength at the place close to the jet.

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Authors and Affiliations

  1. Department of Mechanical Systems Engineering, School of Engineering, Kyushu Tokai University, 9-1-1 Toroku, Kumamoto, Japan

    Nakazono Y.

  2. Industrial Techno-Research Institute, Kyushu Tokai University, Kumamoto, Japan

    Sonoda Y.

  3. Department of Information Systems Engineering, Kyushu Tokai University, Kumamoto, Japan

    Ouchi Y.

  4. Graduate School of Engineering, Kyushu Tokai University, Kumamoto, Japan

    Nasu Y.

Authors
  1. Nakazono Y.
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  2. Sonoda Y.
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  3. Ouchi Y.
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  4. Nasu Y.
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Corresponding author

Correspondence to Nakazono Y..

Additional information

Yoichi Nakazono: He received his B.E., M.E. and D.E. degrees from Tokai University in 1971, 1973 and 1985. He works in Department of Mechanical Systems Engineering, School of Engineering, Kyushu Tokai University as a professor. His research interests are aero-acoustic and development of water musical instrument.

Yoshito Sonoda: He received his Ph.D. in Electrical Engineering in 1983 from Kyushu University. He works in Institute of Industrial Science and Technical Research, Kyushu Tokai University as a professor. His research interests are development of wave-optical sound detection method (optical wave microphone).

Yoshito Ohuchi: He received his B.E. M.E. and D.E. degrees from Kumamoto University in 1978, 1980 and 1996. He is now a Associate Professor in the Department of Information Systems, School of Engineering, Kyushu Tokai University. His research interests are new electronics circuits and computer simulations.

Yuki Nasu: He received his B.E. degree from Kyushu Tokai University in 2006. He is currently a graduate student in the Course of Production Engineering, Graduate School of Engineering, Kyushu Tokai University. His current research interests are noise reduction of supersonic jet noise and application of opt-microphone.

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Nakazono, Y., Sonoda, Y., Ouchi, Y. et al. Near-field acoustic characteristics of screech jet exhausted from a nozzle with a hard reflecting plate. J Vis 11, 153–162 (2008). https://doi.org/10.1007/BF03181930

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  • DOI: https://doi.org/10.1007/BF03181930

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