GB1009115A - Improvements in and relating to gas turbine plants - Google Patents

Abstract

1,009,115. Gas turbine engines; combustion chambers. VOLVO A.B. Aug. 3, 1962, No. 30004/62. Headings F1G and F1L. A gas turbine plant comprises a compressor, a combustion chamber and at least one turbine, the compressor and the turbine or turbines being disposed within an outer casing which is substantially symmetrical with respect to the axis of rotation, the casing having radial openings for air discharged from the compressor, radial openings for the combustion gases discharged from the combustion chamber, and radial outlet openings for the gases discharging from the turbine. The compressor and turbine or turbines are complete units and have gas ducts connected to the respective openings of the outer casing, there being guide surfaces in the outer casing for centring the units therein. The engine shown in Fig. 4 is of the type comprising a separate power turbine which in fact comprises two contra-rotating turbine wheels 7, 11. The engine comprises a centrifugal type air compressor 2a, 2 which is mounted on a shaft 4 and is driven by a radial inward flow turbine 3, 3a. The compressor, compressor turbine and power turbine are complete units with casings and are disposed within an outer casing I which is symmetrical about the engine axis, the compressor and turbines being supported therein at 15, 16, 17, 18, 19. The air discharged from the compressor passes into a diffuser 30 and then through outlets 21 in the outer casing 1 into a space defined between the casing 1 and a surrounding hood member 24. The air is then caused to flow downwardly through the disc 27 of a rotary regenerative heat exchanger, the disc being mounted in a horizontal plane. The preheated air then enters the air jacketed type combustion chamber 32, into which fuel is injected at 36, the resulting combustion gases discharging into a volute 39 which communicates with an opening 22 in the casing 1. The gases are then guided by guide vanes 40 on to the rotor blades 3, 3a of the compressor turbine, the gases then being guided by interstage guide vanes 41 on to the blades 7, 11 of the contra-rotating rotors of the power turbine. The gases then discharge through an outlet 23 in the outer casing 1 to enter the space between the casing and the hood member 24, the gases being guided by a duct 44 to flow radially outwardly through the disc 27 of the rotary regenerative heat exchanger, the gases finally discharging through an outlet 45. The rotary heat exchanger is driven by means of a hydraulic motor 29 which is supplied with fluid from a pump driven from the shaft 4 of the compressor turbine. The power turbine drives the output shaft through epicyclic gearing.