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Propulsive Efficiency of Plane and Axisymmetric Nozzles With Non-Uniform Velocity Distributions

[+] Author Affiliations
Dragan Kožulović

Technische Universität Braunschweig, Braunschweig, Germany

Paper No. GT2010-22074, pp. 13-20; 8 pages
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Education; Electric Power; Manufacturing Materials and Metallurgy
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4396-3 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME


The impact of non-uniform velocity distributions at the exit of plane and axisymmetric nozzles is investigated. For this aim, a general equation for the propulsive efficiency has been derived. Velocity profiles of trigonometric and quadratic form, which provide the same thrust force as constant velocity profiles, have been analysed. Only potential effects of the velocity distribution have been investigated. It is shown that the velocity non-uniformities reduce the propulsive efficiency. This reduction is negligible for small non-uniformities, but it can be up to 20% for large non-uniformities. The results indicate that the constant velocity profile is the optimum distribution for the propulsive efficiency.

Copyright © 2010 by ASME
Topics: Nozzles



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