Exhaust nozzle for suppressing infrared radiation
First Claim
1. An exhaust nozzle (28) operative to suppress the infrared signature radiated from the high-temperature exhaust of an engine (12) including:
- an inlet conduit (46) adapted for receiving a primary flow PF of high-temperature engine exhaust;
a plurality of adjoined lobes (30) integrally formed in combination with said inlet conduit (46) and defining an outlet end of the exhaust nozzle (28), each of said adjoined lobes (30) being substantially perpendicular with respect midplane PM defined by said outlet end, said adjoined lobes (30), furthermore, being adapted for admixing a secondary flow SF of low-temperature gaseous fluid with said primary flow PF of high-temperature exhaust,said engine exhaust nozzle (28) being further characterized by;
said adjoined lobes (30) defining a first and second plurality of penetrating lobes (70,
72), said penetrating lobes (70,
72) each defining an external flow trough (30EFT), said external flow troughs (30EFT) of said first plurality (70) defining a core region (CR);
said penetrating lobes (70,
72) furthermore being inset with respect to each other; and
said second plurality of penetrating lobes (72) projecting axially downstream of said first plurality of penetrating lobes (70) and extending into said core region (CR) so as to direct the secondary flow SF of low temperature gaseous fluid deeply into the primary flow PF of high temperature engine exhaust.
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Accused Products
Abstract
An exhaust nozzle (24 or 28) operative to suppress the InfraRed (IR) signature radiated from the high-temperature exhaust of an engine (12) which exhaust nozzle (24 or 28) includes an inlet conduit adapted for receiving the high-temperature engine exhaust and a plurality of adjoined lobes (30) integrally formed in combination with the inlet conduit. The adjoined lobes (30) are characterized by a first and second plurality of penetrating lobes (60, 62 or 70, 72) which are adapted for admixing low-temperature gaseous fluid with the high-temperature exhaust and which are axially staggered with respect to each other. In the preferred embodiment, at least one of said plurality of penetrating lobes (60 or 62, 70 or 72) extends into a core region (CR) of the exhaust nozzle (24 or 28) to effect thorough mixing of the engine exhaust with the low temperature gaseous fluid. Various embodiments of such exhaust nozzle (24 or 28) are described in the context of a multi-stage mixer/ejector (20).
77 Citations
5 Claims
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1. An exhaust nozzle (28) operative to suppress the infrared signature radiated from the high-temperature exhaust of an engine (12) including:
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an inlet conduit (46) adapted for receiving a primary flow PF of high-temperature engine exhaust; a plurality of adjoined lobes (30) integrally formed in combination with said inlet conduit (46) and defining an outlet end of the exhaust nozzle (28), each of said adjoined lobes (30) being substantially perpendicular with respect midplane PM defined by said outlet end, said adjoined lobes (30), furthermore, being adapted for admixing a secondary flow SF of low-temperature gaseous fluid with said primary flow PF of high-temperature exhaust, said engine exhaust nozzle (28) being further characterized by; said adjoined lobes (30) defining a first and second plurality of penetrating lobes (70,
72), said penetrating lobes (70,
72) each defining an external flow trough (30EFT), said external flow troughs (30EFT) of said first plurality (70) defining a core region (CR);said penetrating lobes (70,
72) furthermore being inset with respect to each other; andsaid second plurality of penetrating lobes (72) projecting axially downstream of said first plurality of penetrating lobes (70) and extending into said core region (CR) so as to direct the secondary flow SF of low temperature gaseous fluid deeply into the primary flow PF of high temperature engine exhaust. - View Dependent Claims (2, 3, 4, 5)
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Specification