GB778611A - Improvements in high temperature combustion arrangements - Google Patents

Abstract

778,611. Generating combustion products under pressure. POWER JETS (RESEARCH & DEVELOPMENTS), Ltd. Jan. 26, 1955 [Feb. 4, 1954], No. 3358/54. Class 51 (1). In combustion equipment, for example, of a ram-jet engine or reheat combustion equipment of a jet propulsion engine, the flame tube which may or may not be disposed within an outer combustion chamber, comprises an outer structural wall 1 and a thin inner shell 2 supported at its upstream end on the structural wall but spaced therefrom along its length to define therewith an annular passage for flow of cooling gas, means also being provided for centring the discharge end of the inner shell when hot within the outer wall. The inner shell has apertures 7 located at its upstream end for admission of cooling gas into the annular passage from the main gas flow passage through the flame tube upstream of the combustion zone. Means are provided for constricting flow of air in the annular passage so as to produce such a pressure drop in the passage that an outwardlydirected pressure difference exists across the inner shell along substantially its whole length, the pressure drop decreasing to a minimum at the hot discharge end. The means comprises plugs 8 which pass through the outer wall and abut against the inner shell, the plugs being retained by a metal strap 9 and clamp 9a. U- section supports 10 are provided on the inner shell to locate the shell within the outer wall. Fuel is supplied through pipes 11 and injectors 12 into the stabilizing baffle 13 formed by a pair of concentric cylindrical walls closed at their upstream end. The outer wall of the baffle is expanded to meet the air diffusion collar 14, apertures 13a being formed in the expanded portion to permit air flow into the stabilized zone.