GB834083A - Fuel vaporizer for a gas turbine engine - Google Patents

Abstract

834,083. Gas-turbine plant. AVCO MANUFACTURING CORPORATION. Sept. 18, 1957 [Oct. 2, 1956], No. 29363/57. Class 110 (3). [Also in Groups XI and XII] A combustion chamber of a gas-turbine engine comprises an inner annular flame tube and an outer annular air casing, air and fuel being admitted to the interior of the flame tube by means of a number of vaporizer units of T-shape disposed in circumferential assembly at the upstream end of the flame tube. The combustion equipment shown in Fig. 2 is disposed around the turbine assembly 11, 14 and comprises an annular flame tube having side walls 15, 16 and a closed upstream end wall 17 of U-section, disposed within an outer casing 18. Air under pressure from a compressor enters the space 19 between the flame tube and the outer casing and some enters the flame tube through scoops 21. Combustion products discharge from the chamber and act on the turbines 11, 14. A T-shape vaporizer is shown in Fig. 4 and comprises a cylindrical base portion 25 which is secured to the curved end wall 23 of the air casing, the base portion 26 having an air inlet opening 35 formed at one side thereof and having secured thereto a tubular shank 26 which projects into the combustion chamber. At the end of the shank 26 remote from the base portion 25 is disposed a transverse tubular cross-piece 28, at the ends of which are further tubular projections 29 disposed parallel to the shank 26. A division plate 37 is disposed within the shank 26 extending across the cross-piece 28, a target or impingement surface 38 being disposed at the upstream end of the division plate 37. The ends of the tubular portions 29 terminate in restricted outlets 39. A fuel injector 32 is disposed within the base portion 25 and directs fuel to impinge on the surface 38 whereby it is mixed with air entering through the inlet 35 from the jacket space around the flame tube. The air and fuel mixture is divided into two equal streams by the division plate 37, the vaporized fuel and air mixtures discharging from the outlets towards deflectors 42 mounted on the flame tube wall 17. Air inlet openings 43 are provided adjacent the deflectors. In a second embodiment, the combustion equipment is of the straightthrough flow type as distinct from the contraflow type shown in Fig. 2 and T-shaped vaporizers as described above are mounted in a transverse plate disposed across the upstream end of the annular flame tube.