"../journal/recordsearchinformation.aspx"; var skid = $(":hidden[id$=HiddenField_SKID]").val(); var args = "skid=" + skid; url = url + "?" + args + "&urllink=" + item; window.setTimeout("showSearchUrl('" + url + "')", 300); } function showSearchUrl(url) { var callback2 = function (xhr2) { } ajax2.get(url, true, callback2, "try"); }
OJFD> Vol.3 No.2A, July 2013
Share This Article:
Cite This Paper >>

Effects of Nozzle-Lip Length on Reduction of Transonic Resonance in 2D Supersonic Nozzle

Abstract Full-Text HTML Download Download as PDF (Size:4131KB) PP. 69-74
DOI: 10.4236/ojfd.2013.32A011    3,194 Downloads   5,106 Views   Citations
Author(s)    Leave a comment
Seoungyoung Shin, Akira Matsunaga, Hiroyuki Marubayashi, Toshiyuki Aoki

Affiliation(s)

Department of Energy and Environmental Engineering, Kyhu University, Fukuoka, Japan.

ABSTRACT

It is known that the transonic resonance takes place, in divergent section of supersonic nozzle, similarly to the longitudinal acoustic resonance of a conical section with one end closed and the other end open. And the conical section is similar to the separation zone between shock wave and nozzle exit in divergent part of supersonic nozzle. The present paper describes an experimental work to investigate a reduction of transonic resonance by change the lip length of 2-Dimensional converging-diverging nozzle. In this study, the nozzle pressure ratio varied in the range between 1.4 and 2.2 as shock-containing flow conditions. And a Schlieren optical system was used to visualize the flow fields. Especially, by using a high-speed video camera, we obtained the shock position at that moment. And acoustic measurements were employed to compare the sound spectra level of each experimental case. And it was found that the transonic resonance was decreased when a large separation zone located at the side, where a nozzle-lip attached to nozzle exit additionally. In this case, the amplitude of shock oscillation and wall static pressure oscillation were also decreased.

 

KEYWORDS

Transonic Resonance; Nozzle-Lip Length; Noise Reduction

Cite this paper

S. Shin, A. Matsunaga, H. Marubayashi and T. Aoki, "Effects of Nozzle-Lip Length on Reduction of Transonic Resonance in 2D Supersonic Nozzle," Open Journal of Fluid Dynamics, Vol. 3 No. 2A, 2013, pp. 69-74. doi: 10.4236/ojfd.2013.32A011.

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1] C. K. W. Tam, “Supersonic Jet Noise,” Annual Review of Fluid Mechanics, Vol. 27, No. 1, 1995, pp. 17-43. doi:10.1146/annurev.fl.27.010195.000313
[2] K. B. M. Q. Zaman, M. D. Dahl, T. J. Bencic and C.Y. Loh, “Investigation of a Transonic Resonance with Convergent-Divergent Nozzles,” Journal of Fluid Mechanics, Vol. 463, No. 1, 2002, pp. 313-343. doi:10.1017/S0022112002008819

  
comments powered by Disqus
OJFD Subscription
E-Mail Alert
OJFD Most popular papers
Publication Ethics & OA Statement
OJFD News
Frequently Asked Questions
Recommend to Peers
Recommend to Library
Contact Us

Copyright © 2020 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.