Control of low volumetric flow instabilites in steam turbines
OwnerBrian Robert HALLER, Timothy Stephen Riceinventors
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Abstract
Configuration of the last stage of a steam turbine where rotor blades rotate encircled by a vane carrier, such that a plurality of passages are located in the vane carrier, such that a fluid is blown through these passages forming a flow that impinges onto the rotor blades, the number of passages, the location of the passages in the vane carrier and the velocity of the flow impinging onto the rotor blades, being calculated in such a way that rotating flow instabilities in the rotor blades when the steam turbine operates at low volumetric flow conditions are avoided.
Claims12
Configuration of a last stage of a steam turbine where rotor blades rotate encircled by a vane carrier, characterized in that a plurality of passages are located in the vane carrier, such that a fluid is blown through these passages upstream of the rotor blades and arranged to form a flow that impinges onto the rotor blades with an injection angle of between zero to −90 degrees against the rotation of the rotor blades such that rotating flow instabilities in the rotor blades when the steam turbine operates at low volumetric flow conditions are reduced.
Dependencies are inferred from the claim text.