초록 ▼

Cascades and associated blocker doors are provided in the lower section of a turbofan engine nacelle such that when the blocker doors are closed the bypass flow is diverted through the open cascades to produce vertical thrust. Vanes are provided in the cascades to assist in directing the diverted ai

Cascades and associated blocker doors are provided in the lower section of a turbofan engine nacelle such that when the blocker doors are closed the bypass flow is diverted through the open cascades to produce vertical thrust. Vanes are provided in the cascades to assist in directing the diverted airflow in the downward direction. The upper section of the bypass duct is isolated from the lower cascade section by way of horizontal struts extending across the bypass duct. A pair of outer doors may be provided over the cascades such that, when opened, they act to provide side skirts to guide the downward flow of air.

대표청구항 ▼

An improved turbofan engine of the type having a core and a nacelle which together define a bypass duct wherein the improvement comprises: (a) a pair of diametrically opposed struts disposed horizontally between the core and nacelle to divide the bypass duct into upper and lower portions; (b) means

An improved turbofan engine of the type having a core and a nacelle which together define a bypass duct wherein the improvement comprises: (a) a pair of diametrically opposed struts disposed horizontally between the core and nacelle to divide the bypass duct into upper and lower portions; (b) means for selectively blocking said lower portion of the bypass duct while leaving open said upper portion thereof, said blocking means being located directly below a portion of said struts to divert the air flowing in said lower bypass duct portion; (c) said struts inhibiting air within the upper bypass duct portion from flowing into the lower bypass duct portion and from being diverted by said blocking means; and (d) cascade means disposed in said nacelle forward of said blocking means for selectively diverting flow from said blocking means in a downward direction to produce lift.