2-D PIV study of near-field flow development from a 2:1 elliptic jet with tabs AIAA-2007-4498

Verma, SB and Venkatakrishnan, L and Ramesh, G (2007) 2-D PIV study of near-field flow development from a 2:1 elliptic jet with tabs AIAA-2007-4498. In: 37th AIAA Fluid Dynamics Conference and Exhibit, 25-28 Jun 2007, Miami, FL..

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Abstract

An experimental investigation is carried out to study the broad features of jet flow development13; from a 2:1 elliptic nozzle using tabs in the minor-axis plane. Further, two types of tab geometries13; are studied, namely, triangular and square with identical blockage area. Each tab conforms to13; 0.5% of the total nozzle exit area. The jet velocity is 21m/s and the Reynolds number based on13; exit equivalent diameter of the nozzle is 5400. PIV visualization studies reveal that each tab13; (irrespective of its shape) sheds a pair of counter-rotating streamwise vortices that help enhance13; overall mixing in major-axis plane. However, in the minor-axis plane, a small vortex originates13; downstream of the square tab top-edge that significantly alters the near-field jet development13; process. As the tab top-edge diminishes to a point (i.e, triangular shape), this small vortex13; structure disappears and so in this case the tab produces only a pair of counter-rotating vortices.13; The results suggest that the tab top-edge shape plays a significant role in the near-field flow13; development in jets by altering the shear layer vortex dynamics considerably.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Elliptic jet;2D PIV system;Mean velocity field
Subjects: AERONAUTICS > Aeronautics (General)
Division/Department: Experimental Aerodynamics Division, Experimental Aerodynamics Division, Experimental Aerodynamics Division
Depositing User: Ms. Alphones Mary
Date Deposited: 08 Feb 2010
Last Modified: 24 May 2010 09:57
URI: http://nal-ir.nal.res.in/id/eprint/5261

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