GB791617A - Improvements in or relating to combustion equipment for gas-turbine engines - Google Patents

Abstract

791,617. Vapour burners. ROLLS-ROYCE, Ltd. March 9, 1955 [Dec. 11, 1953], No. 34639/53. Class 75(1) [Also in Group XII] In combustion equipment for gas turbine engines in which liquid fuel is vaporized prior to being delivered into the main combustion space of the combustion equipment, fuel injection means are provided to provide an air/fuel mixture of the theoretically-correct ratio, this mixture being burned in a pre-combustion zone 23a distinct from the main combustion space 11a of the combustion equipment. Further liquid fuel in injected into the combustion products from the precombustion zone whereby the further fuel is vaporized, the mixture of combustion gases and vaporized fuel being delivered into the main combustion space where the vaporized fuel is burned with air therein. The equipment shown comprises an outer air casing 10a, 10b and a flame tube 11 disposed therein, a conical member 12 being supported by struts 13 from the expansion portion 10b. The upstream end of the flame tube comprises inner and outer cupshaped members 23, 19, a perforated flanged ring member 27 being secured by its flanges to the two cups. The upstream end of the outer cup is flanged at 17 whereby it is mounted on the conical member 12, and the adjacent end 22 of the inner cup is perforated. Fuel is supplied from a manifold 29 to radially-disposed pipes 32 having tangential outlets. Some of the fuel issues through the outlets located in the annular space between the walls of the two cups and mixes with air in the stoichiometric ratio, the mixture being ignited by a spark plug 24. Further fuel is supplied through the pipes 32 into the combustion products and is thereby vaporized. Further air is supplied through the muff 33 and deflectors 34 and the vaporized fuel burns in the primary combustion space 11a.