variable-geometry nozzle

variable-geometry nozzle

A nozzle whose diameter can be changed. It is normally in the shape of a convergent nozzle at subsonic speeds and of a convergent-divergent nozzle at supersonic speeds, or when a reheat is on. A variable nozzle permits the use of afterburner noise reduction and easier starting. The variable geometry may be achieved automatically, depending on the throttle position and/or speed or by controlling it manually from the cockpit. On most aircraft, only the primary (convergent) nozzle position is controlled.
References in periodicals archive ?
The AWT tested nearly every jet engine developed in the United States up through 1957 and conducted pioneering research on afterburners and variable-geometry nozzles.
Innovative filler injection system with flow software control and variable-geometry nozzles (under patent development);
The variable-geometry nozzles move at a rate of 45 degrees per second, providing adequate response time for quick in-flight maneuvers.
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