0
RESEARCH PAPERS

Quasi-Steady Flow and Thrust in Accelerating Nozzles and Channels

[+] Author and Article Information
J. C. Wu, L. Pottsepp

Missiles and Space Systems Division, Douglas Aircraft Company, Inc., Santa Monica, Calif.

J. Eng. Ind 88(1), 24-30 (Feb 01, 1966) (7 pages) doi:10.1115/1.3670886 History: Received February 01, 1965; Online December 08, 2011

Abstract

Internal flows of compressible fluids in nozzles and constant-area channels subjected to constant axial acceleration or gravitation are examined in detail. It is found that the effect of nozzle acceleration or deceleration is analogous to that of perturbing the cross-section area of nonaccelerating nozzle. Acceleration enchances the effect of nozzle divergency and deceleration reduces it. Sonic speed is reached upstream of an accelerating nozzle throat and downstream of a decelerating nozzle. Integral relations of various flow properties are derived and methods for obtaining numerical solutions are developed. Using a power-series expansion in terms of a dimensionless number related to the rate of acceleration, a formula is derived for the estimation of impulse function increment due to acceleration. For constant-area channels, it is found that the flow Mach number always changes away for unity, whereas in a decelerating channel, the Mach number always changes toward unity. Continuous transitions between supersonic and subsonic flows are not possible.

Copyright © 1966 by ASME
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