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Shock and Vibration
Volume 2015, Article ID 675861, 8 pages
http://dx.doi.org/10.1155/2015/675861
Research Article

Analysis of a Low-Angle Annular Expander Nozzle

1School of Mechanical and Manufacturing Engineering, UNSW, Sydney, NSW 2052, Australia
2Aerospace Engineering Department, California Polytechnic State University, San Luis Obispo, CA 93407, USA

Received 16 October 2014; Accepted 10 March 2015

Academic Editor: Chao Tao

Copyright © 2015 Kyll Schomberg et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

An experimental and numerical analysis of a low-angle annular expander nozzle is presented to observe the variance in shock structure within the flow field. A RANS-based axisymmetric numerical model was used to evaluate flow characteristics and the model validated using experimental pressure readings and schlieren images. Results were compared with an equivalent converging-diverging nozzle to determine the capability of the wake region in varying the effective area of a low-angle design. Comparison of schlieren images confirmed that shock closure occurred in the expander nozzle, prohibiting the wake region from affecting the area ratio. The findings show that a low angle of deflection is inherently unable to influence the effective area of an annular supersonic nozzle design.