The invention discloses a duct and a duct assembly for a helicopter. The duct comprises a duct cylinder which is composed of an expansion section and a lip section, wherein the section of the expansion section is in the shape of a right trapezoid, the lip section is located on the expansion section, and the section of the lip section is in the shape of a semicircle; an upper bottom side of the right trapezoid is longer than a lower bottom side of the right trapezoid, a right-angle side of the right trapezoid is located on the outer periphery of the duct cylinder, and the upper surface of the expansion section is overlapped with the lower surface of the lip section; the minimal diameter of the expansion section set as Dt, an expansion angle of the expansion section is set as theta d, the height Cs of the duct cylinder is equal to 0.6Dt, the radius r lip of the section of the lip section is equal to 0.075Dt. According to the duct for the helicopter, provided by the embodiment of the invention, key parameters of the duct are optimally designed, so that the pneumatic performance of tail rotors of the helicopter can be greatly improved, and the redundant weight caused by the duct is reduced.
Duct and duct assembly for helicopter
2015-07-01
Patent
Electronic Resource
English
IPC: | B64C AEROPLANES , Flugzeuge |