Patent ID: 7886520
Filing Date: 2011-02-15
Classification: B64D,F01D,F02C,Y02T

Abstract:
1. A gas turbine engine comprising: a heat exchanger having an outlet duct for a coolant fluid flow passing therethrough during operation of the engine; a by-pass duct having an exit plane; and a ventilation zone defined between a core cowl and an outer cowling, said ventilation zone having a ventilation fluid flow therethrough during operation of the engine and a vent slot sized for said ventilation fluid flow alone, said heat exchanger outlet duct extending to an outlet end in said outer cowling downstream of said by-pass duct exit plane, said ventilation fluid flow and said coolant fluid flow being separate, wherein said heat exchanger outlet duct has a variable geometry nozzle to optimize static pressure reduction and therefore control fluid flow through said heat exchanger during operation of the engine.