Convergent-divergent plug nozzle

Fluid sprinkling – spraying – and diffusing – Reaction motor discharge nozzle with jacketed or hollow... – With subsequent mixing in main discharge stream in or...

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Details

23926541, B64D 3304

Patent

active

040264726

ABSTRACT:
The disclosure shows an annular convergent-divergent plug nozzle for use with a jet engine which comprises an exhaust duct with a concentric plug spaced within the duct and cooperating therewith to form a throat which is followed by an annular exhaust outlet. Means, such as conventional primary flaps, are provided to vary the throat area, and a plurality of spaced secondary flaps are hinged to the duct downstream of the throat to form a secondary nozzle. The secondary flaps can be freely floating so that they assume a position that is determined by the pressure differential across the flaps, and the nozzle is designed so that the exit diameter defined by the secondary flaps is no greater than the maximum plug diameter. Additionally, a secondary concentric casing may be provided to handle bypass air and the secondary flaps may be hinged to the casing in a freely floating manner as above due to the pressure differential. In such an application additional wall flaps are connected to the secondary flaps and cooperate with the primary or main flaps. Connecting means are used to maintain the relative positions of the main flaps and wall flaps and provide an annular opening relative to the primary flaps.

REFERENCES:
patent: 2620623 (1952-12-01), Imbert
patent: 2857119 (1958-10-01), Morguloff
patent: 3210934 (1965-10-01), Smale
patent: 3424384 (1969-01-01), Lacombe

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