Patent GB-839009-A (GB)
Title: Improvements in or relating to combustion equipment of gas turbine engines
Inventor: MURRAY FREDERICK REGINALD
IPC: F23R3/06
Filed: 1956-11-21
Abstract: 839,009. Generating combustion products under pressure. ROLLS-ROYCE Ltd. Nov. 15, 1957 [Nov. 21, 1956], No. 35671/56. Class 51 (1). In combustion equipment of gas-turbine engines of the kind comprising an air casing 10 and within the easing a flame tube 11 wherein combustion occurs, the flame tube walls being spaced from the air casing to provide a passage for flow of air, and having in them circumferentially-spaced apertures 12 through which air flows into the flame tube, flow dividing walls 15 are provided in the air space 13 between the air casing and flame tube in the region of the apertures, each dividing wall extending within the air space radially of the flame tube wall and axially of the combustion equipment across an aperture to divide the air flow to the aperture. An annular radially-extending wall may be provided encircling the flame tube and joining the downstream ends of the flowdividing walls. The annular wall may lie in a plane at right angles to the flame tube axis or it may be of zig-zag form when viewed radially. The combustion equipment shown in Fig. 8 comprises an annular flame tube formed by inner and outer annular walls 22, 23 disposed within an annular air casing formed by inner and outer annular walls 20, 21 and flowdividing walls 34 are associated with the air inlet apertures 32 provided in the outer wall 23 of the flame tube, and flow-dividing walls 134 are associated with the air inlet apertures 32 in the inner wall 22 of the flame tube. The walls 34 are formed with flanges 34a, 34b, the flanges 34a being secured to the air casing wall 21, and the flanges 34b being secured to a frusto-conical annular wall 35 which is secured by its flange 35a to the outer air casing wall 21. The flow-dividing walls 134 are secured by their flanges 134a, 134c to the inner wall 22 of the flame tube at the upstream and downstream sides of the air inlet apertures 32. A frustoconical annular wall 135 is secured by its flange 135a to the inner wall 20 of the air casing, the wall 135 being slightly spaced from the downstream ends of the flow-dividing walls 134. In another arrangement, the flow-dividing walls associated with apertures in the inner wall of the flame tube are secured to the inner air casing wall similarly to the flow-dividing walls 34. The combustion equipment shown in Figs. 9 and 10 comprises a series of tubular flame tubes 42 disposed within an annular air casing afforded by annular walls 40, 41, the flame tube discharge portions 45 each having a radial flange 45a to which are secured baffle plates 46, the assembly of baffle plates substantially closing the space between the air easing walls 40, 41 and the flame tubes at its downstream end. Flow-dividing walls 47a, 476, 47c are associated with the row of air inlet openings 44 in the flame tube. The wall 47a is short radially and is secured to the flame tube by welding 48. The walls 47b are provided with flanges 50 which are secured either to a baffle plate 46 or to the radial flange 45a. The walls 47c have flanges 52 which are secured to the baffle plates 46.