Gas turbine-transmission plant
OwnerSven-Olof Kronogardinventor
Life of this patent
Estimating the term…
Abstract
In a gas turbine power plant including at least three turbine rotors operating upon independent shafts, one rotor is designed to drive the compressor, one is designed to produce the main part of the power output and the third rotor is adapted to aid the two first mentioned rotors, variable transmission means being provided to interconnect the rotor shafts. In order to improve part load efficiency this third rotor is provided with vanes being substantially slim and straight when compared with the conventional reaction type blades of a power turbine, whereby this third rotor may act as a power producing turbine during high loads, and as a power consuming fan during part and low loads.
Claims4
A gas turbine-transmission plant which operates at a temperature T.sub.max at full load comprising:
- (A) a combuster,
- (B) adjustable fuel supply means to said combuster,
- (C) said fuel supply means being adapted to provide, during part load and at a given turbine speed, a gas temperature, upstream of all turbine rotors, being substantially equal to T.sub.max,
- (D) a compressor part comprising a compressor and at least one turbine rotor driving the same for delivering air to said combustor,
- (E) a turbine part comprising at least one power turbine rotor connected to a load, and at least one auxiliary rotor arranged in a common gas flow passage from said combustor to thereby receive gas flow directly therefrom and rotating in a direction opposite thereto,
- (F) said power turbine rotor having conventional reaction type blades, and said auxiliary rotor having vanes with a symmetrical air foil cross section and with a rounded and aerodynamically favorable inlet edge arranged to form a vane grid providing essentially no expansion,
- (G) transmission means interconnecting said auxiliary rotor and compressor driving turbine rotor, and arranged to permit transfer of torque in both directions, and
- (H) means for determining the rotational speed of the said auxiliary turbine rotor, to impose a load on said power turbine when the plant is operating at part load, to make said auxiliary rotor act as a fan.
Dependencies are inferred from the claim text.