GB191401973A - Improvements in and relating to Turbines. - Google Patents

Abstract

1973. Martinel, C. J., Booth, J. E., and Sage, W. Jan. 24. Working-fluid supply.-A combined gas and steam turbine comprises a rotor driven by combustion products and provided with hollow blades. Water circulating in the hollow blades is vaporized and used to drive a second rotor. Air is compressed in a multi-stage centrifugal fan and passes by way of a conduit 10 to a series of combustion chambers B, Figs. 8 and 12, only one of which is shown, arranged in proximity to a two-stage turbine element C. At the entrance to each combustion chamber is a spring-controlled inlet valve 11, Fig 8. Fuel is admitted by way of a pipe 18 to an annular chamber 17 surrounding the casing of the valve 11 whence it is drawn by injector action into the combustion chamber. The combustion chambers comprise a carborundum inner lining 18<a>, Fig. 8, an asbestos or graphite outer lining 19, and a steel casing 20. Each combustion chamber is fitted with an expansion nozzle 23. The turbine element C comprises a rotor built up of parts 27, 31, 60 and provided with two rows of hollow blades 24, 24<a>, Figs. 9 and 12. The combustion products, after acting on these blades, pass to an exhaust conduit 40, Fig. 12. Water is admitted from a pipe 32 and passes by centrifugal action through a diaphragm check valve 34 to the interior of the first row of blades 24, where it is converted into steam ; it then passes into an annnlar channel 37 in the rotor and thence to the interior of the second row of blades 24<a> where it is superheated. The superheated steam passes by way of passages and ports 41, 42, 44, 45, and 46 to a steam rotor D mounted axially with the gas rotor. Balancing moving parts.-The nozzles 23, 46 are mounted on the left and right of their respective rotors in order to balance end thrust.