Pratt & whitney canada corp. (20240426246). ENGINE EXHAUST REVERSE FLOW PREVENTION
ENGINE EXHAUST REVERSE FLOW PREVENTION
Organization Name
Inventor(s)
John Sgouromitis of Dorval (CA)
Kashif Mohammed of Brossard (CA)
Sylvain Lamarre of Boucherville (CA)
ENGINE EXHAUST REVERSE FLOW PREVENTION
This abstract first appeared for US patent application 20240426246 titled 'ENGINE EXHAUST REVERSE FLOW PREVENTION
Original Abstract Submitted
an aircraft engine comprises an exhaust duct receiving an engine gas flow at a first pressure during an operating condition and at a second, lower pressure at shutdown. a heat exchanger duct connected to the exhaust duct has a heat exchanger disposed therein. a cover in the heat exchanger duct includes a closure movable between open and closed positions to fluidly connect or disconnect the heat exchanger duct to the exhaust duct. a biasing member disposed in the exhaust duct, exposed to the gas flow, and operatively connected to the closure biases the closure toward the closed position with a biasing force. first and second forces opposing the biasing force are generated on the biasing member by the gas flow at the first and second pressures, the first being greater than the second. the biasing force is greater than the second force and less than the first force.