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Passive Control of the Two-Dimensional Jet Using a Rectangular Notch

[+] Author Affiliations
Shigetaka Fujita, Takashi Harima

Tokuyama College of Technology, Tokuyama, Japan

Hideo Osaka

Yamaguchi University, Ube, Japan

Paper No. IMECE2002-33566, pp. 483-489; 7 pages
doi:10.1115/IMECE2002-33566
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • 5th International Symposium on Fluid Structure Interaction, Aeroelasticity, and Flow Induced Vibration and Noise
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Applied Mechanics Division
  • ISBN: 0-7918-3659-2 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

The mean and turbulent flow properties of turbulent jet issuing from a quasi two-dimensional (2-D) nozzle with a rectangular notch (aspect ratio: AR=12.5) perpendicular to the two-dimensional nozzle at the midspan, have been measured. The exit Reynolds number was kept constant 13000. The aim of this study is to examine the effects of the rectangular notch on the mean and turbulent flowfields of the two-dimensional jet, and to clarify a possibility of a passive control of the two-dimensional jet using a rectangular notch. From the experiments, it was revealed that the potential core region existed until the section of x/d=25. In the upstream region, the entrainment rate was smaller than that of the two-dimensional jet due to the inward secondary flow on the y and z axes. Furthermore, the streamwise development of the turbulent intensity was delayed.

Copyright © 2002 by ASME
Topics: Passive control

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