Jet Flapping Control with Acoustic Excitation - Journal of Flow Control, Measurement & Visualization

JFCMV > Vol.1 No.2, July 2013

Journal of Flow Control, Measurement & Visualization

Volume 1, Issue 2 (July 2013)

ISSN Print: 2329-3322 ISSN Online: 2329-3330

Jet Flapping Control with Acoustic Excitation ()

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Download as PDF (Size: 810KB) PP. 49-56

DOI: 10.4236/jfcmv.2013.12007 3,503 Downloads 7,090 Views Citations

Author(s)

Shouichiro Iio, Ken Hirashita, Yusuke Katayama, Yoshiaki Haneda, Toshihiko Ikeda, Tomomi Uchiyama

Affiliation(s)

Department of Environmental Science and Technology, Shinshu University, Nagano, Japan.
Department of Mechanical Engineering, Nagano National College of Technology, Nagano, Japan.
EcoTopia Science Institute, Nagoya University, Nagoya, Japan.

ABSTRACT

The dynamics of flapping motion of a rectangular jet under acoustic excitation is studied experimentally by means of hot-wire measurement and flow visualization with smoke method. The excitation sufficiently enables“phase-lock”, which permitted us to extract the organized wave motion from a background field of finite turbulent fluctuations. The mean and fluctuation velocity are investigated and focused on the excitation frequency and the Reynolds number. As the excitation frequency decreases, it was found that the jet flapping and the jet spread were enhanced. The excitation with sub-harmonic frequency has significant effects on the rectangular jet behavior. The maximum value of the periodic velocity fluctuation strongly depends on the excitation frequency.

KEYWORDS

Jet Control; Rectangular Jet; Vortex; Hot Wire; Visualization

Share and Cite:

S. Iio, K. Hirashita, Y. Katayama, Y. Haneda, T. Ikeda and T. Uchiyama, "Jet Flapping Control with Acoustic Excitation," Journal of Flow Control, Measurement & Visualization, Vol. 1 No. 2, 2013, pp. 49-56. doi: 10.4236/jfcmv.2013.12007.

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