convergent-divergent exhaust duct

convergent-divergent exhaust duct

convergent-divergent exhaust ductclick for a larger image
An exhaust duct used in supersonic aircraft. The cross-sectional area of the duct decreases in the direction of the airflow until it is so small that the gas flow becomes supersonic. Thereafter, the duct enlarges so the gases further speed up above the speed of sound.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved