Visualization and dpiv measurements of non-circular coaxial jet flows

Document Type

Conference Proceeding

Publication Date

12-1-2000

Abstract

Reactive Mie-scattering visualizations and Two- Color Digital Particle Image Velocimetry (DPIV) measurements of flows generated by coaxial, non-circular jets are presented. Geometry combinations employing square, triangular, lobed and circular nozzles have been examined. The outer-jet Reynolds number is 19k and the inner-to-outer jet velocity ratio is 0.3. Visualizations were carried out on cross-stream (horizontal) planes, using a pulsed laser sheet and TiCl4 seeding. High-resolution images (3kX2k) were recorded by a CCD camera. Time-averaged visualizations were used to qualitatively assess near-field shear-layer growth. Interesting interactions between inner and outer noncircular nozzle shear layers were observed. Large-scale, structures were observed in the inner wake-like region, but they were not as coherent as in low Reynolds number flows. Axis switching was not observed in any of the non-circular nozzle geometry combinations examined. © 2000 The American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

Publication Source (Journal or Book title)

38th Aerospace Sciences Meeting and Exhibit

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