NOZZLE FOR EXHAUST BRANCH PIPE OF GAS-TURBINE ENGINE OF DOUBLE-ENGINE PO WER PLANT OF HELICOPTER Russian patent published in 2004 - IPC

FIELD: construction and arrangement of helicopter power plant components. SUBSTANCE: proposed nozzle is made in form of tubular member adjoining outlet of exhaust branch pipe. Plane of nozzle exit is inclined relative to vertical and horizontal planes running through longitudinal axis of helicopter; thus, projection of normal on plane of nozzle exit forms angle of 25÷30 deg. with horizontal axis of helicopter and projection of said normal on vertical plane forms angle of 3÷5 deg. with longitudinal axis of helicopter; area of nozzle exit is 70÷75% of inlet area. Direction of exhaust gas jet and velocity of escape of exhaust gases from nozzle provides for considerable reduction of penetration of exhaust gases into air intakes of engines reducing drag of helicopter and consequently improving service characteristics of helicopter. EFFECT: enhanced efficiency; improved service characteristics of helicopter in hovering mode at cruising speed. 3 dwg