IR suppressor

Details IR suppressor IR suppressor

1998-05-11

2000-09-26

Freay, Charles G.

Power plants

Reaction motor

Including motive fluid treating means

60266, 23926517, 23926519, F02K 304

Patent

active

061229075

ABSTRACT:
An IR Suppressor (20) operative to suppress the infrared signature radiated from the high-temperature exhaust of an engine (12) and comprising a primary exhaust manifold (22), first and second mixing ducts (24a, 24b), and a secondary flow shroud (26). More specifically, the primary exhaust manifold (22) includes an elongate duct (28) adapted for receiving a primary flow of the high-temperature engine exhaust from the engine and at least two high aspect ratio nozzles (30a, 30b) integrated in combination with the elongate duct (28). The high aspect ratio nozzles (30a, 30b) are positioned so as to define at least two outlets at the same axial station along the length of the elongate duct (28). The first and second mixing ducts (24a, 24b) are disposed over the high aspect ratio nozzles (30a, 30b) so as to form a mixer/ejector defining at least two ejector inlets (44). The secondary flow shroud (26) is disposed over the mixer/ejector and defines at least one longitudinal inlet (56) disposed in fluid communication with at least one the ejector inlets (44). In operation, the primary flow of engine exhaust is discharged from the high aspect ratio nozzles (30a, 30b) and entrains a secondary flow of ambient air through the longitudinal inlet (56) of the secondary flow shroud (26). The resulting mixed flow is discharged from the IR Suppressor (20) along at least two distinct planes which serve, inter alia, to reduce the envelope of the IR Suppressor (20) while, furthermore, improving suppressor performance.

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