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2. 发明专利

GB1116779A Gas turbine jet propulsion engine 未知
公开(公告)号：GB1116779A
公开(公告)日：1968-06-12
申请号：GB5252066
申请日：1966-11-23
申请人： ROLLS ROYCE
发明人： WRIGLEY BRIAN
IPC分类号： F02K1/56 , F02K1/64 , F02K1/72
摘要： 1,116,779. Deflecting propulsive gases. ROLLS-ROYCE Ltd. 23 Nov., 1966, No. 52520/66. Heading B7G. [Also in Division F1] A gas turbine jet propulsion engine comprises a main flow duct in which are disposed compressor means, combustion equipment, turbine means and an exhaust duct, a second annular flow duct which surrounds the main duct and is adapted to receive air under pressure from a rotor stage of the engine, the turbine means being drivingly connected to the rotor stage. Thrust spoiling means are. located in the exhaust duct and are movable between an inoperative position in which the flow of jet gases through the exhaust duct is substantially unaffected, and a thrust spoiling position in which the pressure in the exhaust duct is reduced so as to increase the speed of rotation of the rotor stage. A thrust reverser is provided at the downstream end of the second flow duct. The engine shown comprises a fan 14, a main duct 11 in which are disposed a compressor 15, combustion equipment 15a, turbine 16 and jet pipe 17, and a fan duct 12 surrounding the main duct, the fan supplying air to the main duct and to the fan duct. The downstream end portion 28 of the inner casing 18 is axially movable by means of actuators 29 between the positions shown in. full lines and in broken lines. In the latter position an opening 32 is formed in the duct wall and the turbine exhaust gases discharge laterally through the opening, this being a thrust spoiling arrangement, The pressure downstream of the turbine is thereby reduced so that the speed of the turbine and thus of the fan 14 driven thereby is increased. A thrust reversing device 24 is disposed at the downstream end of the outer casing 19 and is moved from the retracted position shown in full lines to the operative position shown in broken lines by means of actuators 25 simultaneously with the movement of the casing portion 28 to the thrust spoiling position. Thus the flow of air through the fan duct 12 is increased when the thrust reverser is operative so increasing the braking effect.

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