Rotary kinetic fluid motors or pumps – With passage in blade – vane – shaft or rotary distributor...
Reexamination Certificate
1999-02-22
2001-04-03
Look, Edward K. (Department: 3745)
Rotary kinetic fluid motors or pumps
With passage in blade, vane, shaft or rotary distributor...
C415S206000, C415S207000, C415S208300, C415S211200
Reexamination Certificate
active
06210104
ABSTRACT:
FIELD OF THE INVENTION
The present invention pertains to the removal of cooling air from the diffuser part of a radial stage of a compressor of a gas turbine.
BACKGROUND OF THE INVENTION
In a gas turbine, which comprises a compressor, a combustion means and a turbine, cooling air, which is removed from the compressor under high pressure, is needed to cool the components that come into contact with hot gas.
In a gas turbine developed by the applicant, compressed air is removed from a radial stage of a compressor, which is an end stage in this case, through the suction-side side wall of the diffuser vane.
The compressed cooling air is removed from the compressor stage, which comprises a rotor disk and a diffuser, and is fed to a cooling air line arranged in the housing of the compressor. A deadwater or separation area, which compromises the efficiency of the entire compressor stage, frequently develops in such a diffuser in the suction-side, rear area of the flow channel due to the buildup of boundary layers on the diffuser vanes.
SUMMARY AND OBJECTS OF THE INVENTION
The primary object of the present invention is to design the removal of cooling air in the compressor part of a gas turbine such that favorable effects on the compressor efficiency are generated from a fluidic viewpoint.
According to the invention, removal of cooling air from the diffuser part of a radial stage of a compressor of a gas turbine is provided with at least one opening arranged in the horizontal blind holes on the suction side of the diffuser blading. Cooling air holes are led through the diffuser housing outside and they are connected to the cooling air discharge.
The openings may be designed as round openings. The openings may also be designed as slots.
The removal of cooling air is brought about by the device according to the present invention such that the compressed cooling air is removed through openings or slots from horizontally extending holes within the diffuser vane on the suction side of the diffuser vanes.
These horizontally arranged holes of the diffuser vanes are connected by analogous holes of the same type in the outside of the diffuser to the cooling air discharge in the compressor housing, so that the compressed cooling air is fed from the diffuser directly to the outside air channel. The boundary layer is thus drawn off on the suction side of the diffuser vanes. As a result, a deadwater area is prevented from forming or it is at least greatly reduced, which increases the efficiency of the entire stage.
On the whole, a deadwater area is avoided by the device according to the present invention, which leads to a reduction of the losses in the diffuser and to an increase in the efficiency of the stage.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which preferred embodiments of the invention are illustrated.
REFERENCES:
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patent: 4131389 (1978-12-01), Perrone et al.
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Mattingly, Jack D. 1996Elements of Gas Turbine Propulsion.
Look Edward K.
Man Turbomaschinen AG GHH Borsig
McGlew and Tuttle , P.C.
Nguyen Ninh
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