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International Journal of Turbo & Jet-Engines

Ed. by Sherbaum, Valery / Erenburg, Vladimir


IMPACT FACTOR 2018: 0.863

CiteScore 2018: 0.66

SCImago Journal Rank (SJR) 2018: 0.211
Source Normalized Impact per Paper (SNIP) 2018: 0.625

Online
ISSN
2191-0332
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Volume 29, Issue 2

Issues

Effect of Tab Geometry on the Development of a Jet Issuing from a Rectangular Nozzle

Abraham Arokkiaswamy
  • Corresponding author
  • Department of Aeronautical Engineering, MVJ College of Engineering, Bangalore, Karnataka, India
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  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Shashi Bhushan Verma
  • Council of Scientific and Industrial Research, National Aerospace Laboratories, Experimental Aerodynamic Division, Bangalore, India
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Venkateswaran
Published Online: 2012-06-28 | DOI: https://doi.org/10.1515/tjj-2012-0006

Abstract

An experimental investigation was carried out to study the effect of tab geometry on the flow characteristics of a jet issuing from a 2:1 rectangular nozzle using two-component hotwire anemometry. A pair of tabs of trapezoidal and square configurations (2% total blockage area) is placed on the minor-axis side of the rectangular nozzle and tested for two tab inclination angles of 135° and 45°, respectively. Tests were conducted for a nominal jet exit velocity of 20 ms-1 corresponding to a Reynolds number based on nozzle equivalent diameter of 5.02×104. Relative to the plain jet, the potential-core length of the jet with trapezoidal tabs shows a reduction of 62% while the jet with square tabs shows a reduction of 75%, respectively. This is also accompanied by a significant upstream shift in peak centerline turbulence intensity (u'/Ue). The tab inclination of 135° results in further enhanced jet characteristics in each case. The presence of each tab configuration is observed to inhibit the jet growth along the minor-axis plane thereby introducing large distortion in the jet cross-sectional development that ultimately leads to jet-core bifurcation along its major-axis. However, it is observed that while the jet with trapezoidal tabs switches its axis at some downstream location, the jet with square tabs does not switch axis at all. This indicates a strong influence of tab geometry on the overall jet flow development.

Keywords.: Center-line decay; hot-wire anemometry; jet mixing; rectangular jets; trapezoidal tab; square tab

About the article

Received: 2012-02-18

Accepted: 2012-02-20

Published Online: 2012-06-28

Published in Print: 2012-06-28


Citation Information: Int. J. Turbo Jet-Engines, Volume 29, Issue 2, Pages 49–57, ISSN (Online) 2191-0332, ISSN (Print) 0334-0082, DOI: https://doi.org/10.1515/tjj-2012-0006.

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©2012 by Walter de Gruyter Berlin Boston.Get Permission

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