0
RESEARCH PAPERS

Evaluation of Flip-Flop Jet Nozzles for Use as Practical Excitation Devices

[+] Author and Article Information
Ganesh Raman

NYMA, Inc., NASA Lewis Research Center Group, Brookpark, OH 44142

Edward J. Rice

NASA Lewis Research Center, Cleveland, OH 44135

David M. Cornelius

Department of Aeronautics and Astronautics, Stanford University, Stanford, CA 94305

J. Fluids Eng 116(3), 508-515 (Sep 01, 1994) (8 pages) doi:10.1115/1.2910306 History: Received October 21, 1993; Revised April 24, 1994; Online May 23, 2008

Abstract

This paper describes the flowfield characteristics of the flip-flop jet nozzle and the potential for using this nozzle as a practical excitation device. It appears from the existing body of published information that there is a lack of data on the parameters affecting the operation of such nozzles and on the mechanism of operation of these nozzles. An attempt is made in the present work to study the important parameters affecting the operation and performance of a flip-flop jet nozzle. Measurements were carried out to systematically assess the effect of varying the nozzle pressure ratio (NPR) as well as the length and volume of the feedback tube on the frequency of oscillation of this device. Flow visualization was used to obtain a better understanding of the jet flowfield and of the processes occurring within the feedback tube. The frequency of oscillation of the flip-flop jet depended significantly on the feedback tube length and volume as well as on the nozzle pressure ratio. In contrast, the coherent velocity perturbation levels did not depend on the above-mentioned parameters. The data presented in this paper would be useful for modeling such flip-flop excitation devices that are potentially useful for controlling practical shear flows.

Copyright © 1994 by The American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In