GB687667A - Improvements in or relating to combustion systems - Google Patents

Abstract

687,667. Burner apparatus, BRISTOL AEROPLANE CO., Ltd. March 29, 1951 [April 3, 1950], No. 8339/50. Class 75(i) [Also in Groups XII and XXVI] Means for burning fuel in a combustion - supporting medium, such as air comprises a main duct along which the air stream passes and an inner duct spaced from the main duct, the inner duct being formed with a zone of sudden enlargement and part of the wall of this zone is formed of porous material behind which is disposed a fuel distribution chamber. In the ram-jet device shown in Fig. 1, the inner duct comprises a plain cylinder 11 spaced from a frusto-conical portion 14 which is connected at its upstream edge 17 to another frusto-conical portion 15. The downstream end of the portion 14 is formed as an annular plate 20 which forms the sudden enlargement, the wall 22 being formed of porous material such as compresssed and sintered granules of metal and a fuel distribution chamber 21 surrounds the porous wall 22. A second enlargement is provided downstream of the first by means of an annular baffle 23. In the embodiment shown in Fig. 4, the innermost portion 40 of the inner duct extends right to the edge 17 and is provided at its downstream end with a flared trumpet-shaped deflector 36 which is connected to a part 41 forming an extension of the part 40, and a flame tube 45 with a spray type fuel injector 46 is disposed within the innermost duct. The porous wall 22 may be closed at low output; alternatively, the spray injector and porous wall may use different fuels such as liquid and gaseous fuels. The invention is applicable to an annular-type of combustion chamber as well as to the tubular types shown in Figs. 1 and 4. In Fig. 6, a combustion chamber is connected between the compressor 25 and turbine 26, and fuel is fed from a tank 86 by means of a pump 80 driven from the turbine by a shaft 81, and flows through a pressure controller 82 and pipe 83 to the pilot spray injectors 46. Fuel also passes from the pump 80 through the pipe 84, throttle control unit 85 and a minimum pressure shut-off valve 89, through the metering orifices 88 to the porous wall 22. The throttle control 85 may replace or follow immediately after the pressure controller 82.