Air-Oil Heat Exchangers with Minimum Bypass Flow Pressure Loss

摘要

A geared turbofan engine having a bypass ratio of at least six (6) includes a nacelle that encloses a fan assembly and at least part of an engine case that houses an engine core. The fan assembly is disposed fore of the engine case. The nacelle and engine case defining an annular fan duct for air flow that passes through the fan but that bypasses the engine core. The nacelle includes a fore end and an aft end that defines a fan nozzle with the engine case. The engine case includes an inlet and an outlet. The inlet is connected to a duct that extends within the engine case to the outlet. The duct accommodates an air-oil heat exchanger between the inlet and outlet of the duct, which may be used for the gearbox dedicated to reducing the speed of the fan as compared to the low pressure turbine.

主权项

1. A gas turbine engine comprising:
a nacelle that encloses a fan assembly and at least part of an engine case, the nacelle and engine case defining an annular bypass flow path for air flow that passes through the fan but that bypasses an engine core disposed within the engine case; the nacelle including a fore end and an aft end that defines a fan nozzle with the engine case; the engine case including an inlet connected to a duct that extends to an outlet, the duct accommodating a heat exchanger between the inlet and outlet of the duct; and the heat exchanger transfers heat from oil or lubricant to air passing through the duct.