Affordable Nozzles Employing the Fixed Aperture Design Approach PUBLIC ACCESS

[+] Author Affiliations
Ernie Schuster, Phil Smereczniak

Boeing Company Phantom Works

Ron Luffy, Steve Scavo

General Electric Aircraft Engine Company

Paper No. 98-GT-355, pp. V002T02A010; 7 pages
  • ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery
  • Stockholm, Sweden, June 2–5, 1998
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7863-7
  • Copyright © 1998 by ASME


Fixed aperture (FA) nozzles offer the potential to significantly reduce the complexity and cost of afterburning turbine engine exhaust nozzles. This is accomplished by utilizing secondary air from an ejector system to control primary jet expansion at low nozzle pressure ratios and thereby eliminating the variable position divergent flaps and associated actuators, linkages, and hydraulics. The relatively cool ejector air flowing over the hot nozzle surfaces, combined with the gapless external airframe interfaces enabled by the fixed divergent section, offer the possibility for concurrent reductions in infrared and radar signatures. The installed aerodynamic performance of FA-based ejector nozzles has been analyzed with several engine cycles to explore these potential benefits.

Copyright © 1998 by ASME
Topics: Design , Nozzles
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