Mass Flow and Thrust Performance of Nozzles With Mixed and Unmixed Nonuniform Flow

[+] Author and Article Information
Reiner Decher

Department of Aeronautics & Astronautics, Box 352400, University of Washington, Seattle, WA 98195-2400

J. Fluids Eng 117(4), 617-622 (Dec 01, 1995) (6 pages) doi:10.1115/1.2817312 History: Received April 11, 1994; Revised February 23, 1995; Online December 04, 2007


The calculated thrust and mass flow rate of a nozzle depend on the uniformity of the entering flow. The one-dimensional flow equations are extended to arrive at analytic expressions for the predicted performance of a nozzle processing two streams whose properties are determined ahead of the throat. The analysis approach forms the basis for the understanding of flows which have more complex distributions of total pressure and temperature. The uncertainty associated with mixing is examined by the consideration of the two limiting cases: compound flow with no mixing and completely mixed flow. Nozzle discharge and velocity coefficients accounting for non-uniformity are derived. The methodology can be extended to experimentally measured variations of flow properties so that proper geometric design variables may be obtained.

Copyright © 1995 by The American Society of Mechanical Engineers
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