GAS-TURBINE GAP CONTROL DEVICE, GAS TURBINE INCORPORATING SUCH DEVICE, AND TURBOMACHINE INCORPORATING SUCH TURBINE Russian patent published in 2007 - IPC F01D11/14 

FIELD: gas-turbine control in turbine manufacture.

SUBSTANCE: proposed turbomachine has turbine incorporating moving blades and stationary annular assembly incorporating annular case provided with at least two annular projections spaced apart in axial direction and protruding in radial direction on external side of mentioned case, as well as gap control device inserted between tops of moving blades and stationary annular assembly. Gap control device has annular control unit around stationary annular assembly case and air feed means formed by at least three annular ducts spaced apart in axial direction and disposed on both lateral sides of each projection, means for air supply to air feed ducts, means for air cooling of projections to vary temperature of stationary annular assembly formed by at least one top row of N holes provided in each air feed duct and disposed against one side surfaces of projections, and at least one bottom row of 2N holes disposed against projection-to-case mating section; N holes in each top row are offset over circumference relative to 2N holes in respective bottom row.

EFFECT: optimized air supply for enhancing efficiency and uniformity of cooling stationary annular assembly.

9 cl 3 dwg