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Rotor blade of diagonal flow water turbine

A technology for runner blades and water turbines, applied in the field of fluid machinery, can solve problems such as the lack of mathematical equation expressions for the design and calculation of water turbine impellers, and the inability to establish hydraulic models, etc.

Inactive Publication Date: 2005-06-01
XIHUA UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

In the patent literature database, for example, the patent number: ZL97195388.0 "The Impeller of Francis Water Turbine" only proposed the structural shape, but did not propose the mathematical equation expression for the design and calculation of the impeller of the water turbine, so the hydraulic model cannot be established

Method used

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  • Rotor blade of diagonal flow water turbine
  • Rotor blade of diagonal flow water turbine
  • Rotor blade of diagonal flow water turbine

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Embodiment Construction

[0032] Such as figure 1 , figure 2 Equations (1), (6), (12), (14) are used to form the S-based 1 The main equation for the calculation of the quasi-three-dimensional inverse problem of the flow surface, through S 2m The flow surface calculates S for a given initial profile 1 Flow Surface Inverse Problem and Average S 2m The positive problem of the flow surface is iterated, and on the surface of revolution (S 1 Relative flow surface) introduces the "equivalent velocity triangle", uses the axial velocity change rate ξ and the flow surface inclination parameter η to correct the influence of the cascade performance change caused by the flow surface inclination and axial velocity change, and designs the oblique flow rotor wheel blades. After the calculation of the axial surface flow is carried out to obtain the axial surface flow, several rotations S can be obtained 1 face, and then turn S 1 The blade shape is designed on the flow surface, and finally these blades are press...

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Abstract

The present invention is one kind of blade for oblique flow type water turbine. Reasonable flow model for the blade is established, the model and basic equations are used to constitute main equation for quasi-3D indirect problem calculation based on the S1 stream interface, basic datan are obtained based on the calculation with these basic equations, and blade for oblique flow type water turbine is manufactured based on the said basic data. The blade has excellent energy and cavitation erosion performance. The impeller has 5 or 6 of the said blades and is used in water head of 30-70 meter.

Description

Technical field: [0001] The invention relates to a runner blade of a diagonal flow water turbine, which belongs to the field of fluid machinery. Background technique: [0002] Hydro turbines are special power machinery for hydropower stations. The installed capacity of hydropower stations accounts for about 25% of the total installed capacity of the country. Therefore, the performance of hydroturbines is directly related to the output and life of hydropower stations. The main types of water turbines are axial flow type, mixed flow type, tubular flow type, impact type, etc. Diagonal flow type turbine is a model between axial flow type and mixed flow type. In the patent literature database, for example, the patent number: ZL97195388.0 "Impeller of Francis Water Turbine" only proposes the structural shape, but does not propose the mathematical equation expression for the design and calculation of the impeller of the water turbine, so the hydraulic model cannot be established. ...

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Application Information

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IPC IPC(8): F03B3/12F03B13/00
CPCY02E10/20Y02P70/50
Inventor 张礼达余波陈冬冬
Owner XIHUA UNIV