Power plants – Combustion products used as motive fluid – Combustion products generator
Patent
1993-04-05
1994-08-16
Bertsch, Richard A.
Power plants
Combustion products used as motive fluid
Combustion products generator
416236R, F23R 316
Patent
active
053375688
ABSTRACT:
A gas turbine engine hot section component such as a turbine blade or vane having an airfoil is provided a non-film cooled portion of a heat transfer wall having a hot surface and a plurality of longitudinally extending micro-grooves disposed in the portion of the wall along the hot surface in a direction parallel to the direction of the hot gas flow. The depth of the micro-grooves is very small and on the order of magnitude of a predetermined laminar sublayer of a turbulent boundary layer. The grooves are sized so as to alter the boundary layer thickness near the leading edge of the airfoil to reduce heat transfer from the hot gas flow to the airfoil near the leading edge. In one embodiment the micro-grooves are about 0.001 inches deep and have a preferred depth range of from about 0.001 inches to 0.005 inches and which are square, rectangular, or triangular in cross-section and the micro-grooves are spaced about one width apart.
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Abuaf Nesim
Goebel Steven G.
Lee Ching-Pang
Bertsch Richard A.
General Electric Company
Herkamp Nathan D.
Squillaro Jerome C.
Thorpe Timothy S.
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