Power plants – Combustion products used as motive fluid – With exhaust treatment
Reexamination Certificate
1986-01-14
2001-02-06
Tudor, Harold J. (Department: 3641)
Power plants
Combustion products used as motive fluid
With exhaust treatment
C060S265000, C239S127100, C239S265170, C239SDIG007
Reexamination Certificate
active
06182440
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to infrared radiation suppressors and more particularly to an infrared radiation suppressor which utilizes a Coanda surface and film cooling concepts.
BACKGROUND OF THE INVENTION
Infrared radiation homing missiles have been developed for tracking down aircraft or vehicles which utilize either gas turbines or other engines, as metal parts which are exposed to hot exhaust gases from the engines would tend to radiate infrared radiation. Thus, it becomes necessary, in order to decrease the vulnerability of aircraft, vehicles or other engine-driven equipment which have hot gas exhaust systems, to suppress the visible and infrared radiation.
One conventional method of suppressing the detection of infrared radiation is to have an elbow connected to the exhaust such that all parts which are exposed to the hot exhaust gases would be hidden from the view of an infrared radiation detector. However, arising with the use of the elbow are problems of hot exhaust gases recirculating within the cavity of the elbow, thereby aspirating atmospheric air into the cavity, and the inside concave surface of the same elbow being impinged directly by hot exhaust gases. As a consequence, this hot surface would emit infrared radiation, thereby defeating the purpose of the elbow. Also, the same surface would be overheated as it is very difficult to cool this upper surface—witnessed by the use of multilayered ducts to channel hot air away from the engine generator set—disclosed by Allard in U.S. Pat. No. 4,413,668.
BRIEF DESCRIPTION OF THE PRESENT INVENTION
The present invention eliminates the aforesaid problems by allowing a smooth evacuation of hot exhaust gases and the simultaneous cooling of the upper surface of the exhaust chamber by utilizing the Coanda surface effect in conjunction with film cooling technology. To prevent gas impingement on the upper surface of the exhaust chamber, a curved plate based on the Coanda effect is used for guiding hot exhaust gases out of the exhaust chamber. To keep the curved plate cool and to prevent hot exhaust gases from recirculating within the exhaust chamber, film cooling technology is used to cool the Coanda plate and the exhaust chamber and to entrain the hot exhaust gases therefrom.
When utilizing the present invention, the following objectives can be achieved:
1) the avoidance of a direct line of sight of an IR detector into the actual source of infrared emission;
2) the elimination of immediate heat impingement on the upper surface of the exhaust chamber;
3) the improved suppression of infrared radiation from the hot exhaust system.
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Attard Salvatore
Bilenas Jonas
Kosson Robert
Anderson Terry J.
Hoch, Jr. Karl J.
Northrop Grumman Corporation
Tudor Harold J.
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