GB715910A - Improvements in or relating to combustion equipment of gas-turbine engines - Google Patents

Abstract

715,910. Generating combustion products under pressure. ROLLS-ROYCE, Ltd. Jan. 21, 1953 [Feb. 1, 1952], No. 2794/52. Class 51 (1) In an annular air jacketed type of combustion chamber of a gas turbine engine, an annular wall section of a flame tube is formed of a number of segmental parts having flanges along their adjacent edges, the parts being secured together by means of channel members which straddle the flanges, and retainer members in contact with the surfaces of the segmental parts opposite those from which the flanges project, the channel and retainer members being in interlocking engagement. In the embodiment shown, both the inner and outer walls of the annular flame tube are formed in accordance with the invention, the walls being formed of annular sections 18 ... 24 each of which is formed of four segmental parts. The parts have axially-extending flanges such as 19a along adjacent edges and the sections are corrugated where they overlap to form air inlets to the combustion space. A channel member 31 stradd'es flanges of the four flame tube sections and is stepped to allow for the increasing diameters. The retainer member comprises a T-section member 32 having a common flange 32a and stepped web portions 32b, the webs of the T-member being in contact with the inner surfaces of the segments, and the flanges projecting radially outwardly between the flanges of the segmental parts. The flange of the T-member is formed with lugs 34, slotted at 35 and the base of the channel member is formed with slots 33, the undercut lugs being passed through the slots to engage with the base of the channel upon axial movement. The channel and T-members abut against the flame tube structure at one end and are prevented from disengagement bv suitable means at the other end. The inner wall of the flame tube is similarly formed. The flanges of the channels associated with the inner wall of the flame tube are notched to engage a circumferential flange formed on the ring 25b forming part of the inner air casing wall 25. The ring 39 is axially s'idable and engages parts welded to the segments of the flame tube wall 24 and also engages the T-section retainer members. The ring 39 is locked in position by means of pegs 41 mounted in tubular members 42 which extend across the flame tube and are bolted to the outer air casing. The tubular members are surrounded by U-section jackets 46 to which cooling air is supplied, the air discharging therefrom across the nozzle boxes 16. Specification 715,909 is referred to.