GB774502A - Gas turbine plant - Google Patents

Abstract

774,502. Gas-turbine plant. POWER JETS (RESEARCH & DEVELOPMENT), Ltd. June 30, 1955 [July 1, 1954], No. 19357/54. Class 110 (3). In a gas-turbine power plant comprising a rotor carrying two concentric rows of blades one within the other, the two rows operating at different temperatures, the blades of the blade row operating at the lower temperature are mounted at their ends nearest the other blade row on an annular support member to which is connected one end of an axiallyextending ring which is formed with a plurality of axially-extending slits open at the other end of the ring. The slits provide between them a plurality of flexible fingers, the end of each finger being secured to one of the blades of the other blade row at the end of that blade nearer the first-mentioned blades. The gas-turbine plant shown is of the ducted-fan type and comprises two contra-rotating turbine rotors 4, 6, the turbine 4 being connected through shaft 5 to the compressor 3, and the turbine 6 being connected to the ducted fan blades 7 which are disposed in the duct 8. The blades 6a mounted on the rotor disc 6 have tip shrouds 6b which are not connected with each other. A thin sheet metal frusto-conical ring 10 having flanges 10a, 10e at its ends is formed with axial slits 10b (see Fig. 3), the slits forming axial fingers 10d and the flange 10e on each finger 10d is secured to a blade tip shroud 6b. The other flange 10a of the ring 10 is secured to a built-up annular support member 9 which is formed with a groove 9a in which the roost of the ductedfan blades 7 are mounted. A second ring member 11 having axial slits 11b forming fingers 11a is secured by flanges on the fingers 11a to the individual tip shrouds 6b. Interengaging sealing rings 9c and 1b are mounted on the support member 9 and combustion chamber outer casing 1a respectively. Cooling air flows from the space between the combustion chamber casing 1a and the wall 2 of the annular flame tube between the blade shrouds 6b, 4b and the support member 9 through the slits 10b, 11b in the rings 10, 11. The outer wall 13 of the ducted fan is connected by struts 14 to the combustion chamber casing 1a, and carries a row of stationary blades 15. The invention is also applicable in the case of gas-turbine plant in which the annular compressor flow channel is disposed around the annular turbine flow channel. Specification 774,503 is referred to.