Power plants – Combustion products used as motive fluid – With exhaust treatment
Reexamination Certificate
2007-10-23
2007-10-23
Casaregola, L. J. (Department: 3746)
Power plants
Combustion products used as motive fluid
With exhaust treatment
C060S264000
Reexamination Certificate
active
10917212
ABSTRACT:
A passive exhaust system is described that provides effective infrared signature suppression without affecting radar cross-section while maintaining stable function in crosswinds. A passive exhaust system may include an array of ducts with each duct having a primary and secondary nozzle. Central ducts draw in ambient cooling air to create a thick cooling film along exterior surfaces and cause plume dilution, stabilize the plume flow in a crosswind, and prevent heating of visible surfaces. Visible surfaces may incorporate radar absorbing materials and may be inclined at an angle or fabricated with a diffuse surface to prevent specular reflection. Visible surfaces may be constructed from or covered with low infrared emissivity materials. A variable passive flow controller ensures a sufficient velocity exhaust flow.
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Alston & Bird LLP
Casaregola L. J.
Northrop Grumman Ship Systems, Inc.
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