초록 ▼

A plurality of blocker door vanes are disposed in the bypass duct to selectively close off the bypass flow and increase the flow and pressure of the air flowing into the compressor. In this way, the compressor inlet pressure can be increased sufficiently to allow air starts without starter torque as

A plurality of blocker door vanes are disposed in the bypass duct to selectively close off the bypass flow and increase the flow and pressure of the air flowing into the compressor. In this way, the compressor inlet pressure can be increased sufficiently to allow air starts without starter torque assist. The vanes may also be closed down during ground idle to reduce the thrust and increase the compressor bleed pressure and both the pressure and the temperature of the air to the combustor. Provision is made for the controlling of the blocker door vanes as a function of core speed.

대표청구항

A method of facilitating air starts in a turbofan engine of the type having a core, a fan, and a bypass duct, comprising the steps of: (a) blocking the flow of air in the bypass duct; and (b) increasing the inlet pressure to the compressor to a level which will allow an air start.

A method of facilitating air starts in a turbofan engine of the type having a core, a fan, and a bypass duct, comprising the steps of: (a) blocking the flow of air in the bypass duct; and (b) increasing the inlet pressure to the compressor to a level which will allow an air start.