Rotary kinetic fluid motors or pumps – With passage in blade – vane – shaft or rotary distributor...
Patent
1997-02-04
1998-07-14
Kwon, John T.
Rotary kinetic fluid motors or pumps
With passage in blade, vane, shaft or rotary distributor...
416 96A, F04D 2938
Patent
active
057794383
ABSTRACT:
An arrangement and method for cooling a wall surrounded on one side by hot gas, for example, a guide blade of a turbine, where cooling air is directed into a space between the wall and a cooling insert wall, and allowed to flow through rows of holes in the wall to an outer surface of the wall. A rib is arranged upstream of the row of holes on the inner surface of the wall, and the cooling insert wall is shaped to bulge toward the wall at the hole location, so that a guiding surface parallel to an entry angle of the holes is provided. By causing the cooling air to flow in the entry angle of the holes before it reaches the holes, the cooling air forms stable inner-vortex pairs in the flow, and entry losses are reduced. Cooling air not flowing into a first row of holes is accelerated and guided past spacers and pins in the space, before being guided to downstream rows of holes.
REFERENCES:
patent: 3628885 (1971-12-01), James
patent: 5533864 (1996-07-01), Nomoto et al.
"Experimentelle und numerische Untersuchungen der Mischungsvorgange zwischen Kuhlfilmen und Gitterstromung an einem hobhbelasteten Turbinengitter", Wilfert, 1994.
ABB Research Ltd.
Kwon John T.
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