Vertical axis axial-flow kaplan turbine power station cavitation coefficient calculating method

A technology of cavitation coefficient and calculation method, applied in the direction of calculation, data processing application, instrument, etc., can solve problems such as inability to meet the cavitation coefficient of the power station, it is difficult to meet the new hydropower engineering requirements, and cannot be selected correctly.

Active Publication Date: 2018-08-17
POWERCHINA CHENGDU ENG
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Problems solved by technology

Since this method estimates the cavitation coefficient σ of the power station according to the statistical formula p , there are many statistical formulas of this kind at present, because the water turbine parameter sample data on which each statistical formula is based is before the 1970s and 1980s or a certain water head section or a certain specific speed n s range, there are certain limitations, the results estimated by different statistic

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  • Vertical axis axial-flow kaplan turbine power station cavitation coefficient calculating method
  • Vertical axis axial-flow kaplan turbine power station cavitation coefficient calculating method
  • Vertical axis axial-flow kaplan turbine power station cavitation coefficient calculating method

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Embodiment Construction

[0013] In the present invention, firstly, by collecting and arranging the data of a large number of well-operated vertical shaft axial flow propeller hydroelectric generating units at home and abroad in the past 30 years, according to the maximum application water head H of the hydro turbine max , divide the data into H max ≤30m and H max For two groups > 30m, the least square method is used to use a large number of turbine parameters as sample data, and regression statistics are used to obtain the cavitation coefficient σ p Calculation formula: when H max ≤30m, When H max When >30m, After doing a lot of calculation and derivation work in the early stage, a more reasonable calculation method was creatively summarized for the cavitation coefficient of the vertical axis axial flow propeller turbine power station. Since the present invention will H max The range is divided, so the vertical axis axial flow paddle turbines corresponding to different water head ranges have d...

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Abstract

The invention relates to a hydropower station water turbine, and discloses a vertical axis axial-flow kaplan turbine power station cavitation coefficient calculating method. The vertical axis axial-flow kaplan turbine power station cavitation coefficient calculating method can calculate the vertical axis axial-flow kaplan turbine power station cavitation coefficient more reasonably, so as to satisfy the new water-power engineering requirement. The vertical axis axial-flow kaplan turbine power station cavitation coefficient calculating method includes the steps: determining the specific speed of an axial-flow kaplan turbine, wherein the specific speed is recorded as ns; determining the maximum application water head of the axial-flow kaplan turbine, wherein the maximum application water head is recorded as Hmax, and determining the range to which the Hmax belongs; according to the power station cavitation coefficient calculating formula of the Hmax corresponding range, calculating the power station cavitation coefficient, wherein the power station cavitation coefficient is recorded as Sigma

and the power station cavitation coefficient calculating formula of the range is that: when Hmax <=30m, Sigma

= 6*10(-6)*n<s><1.8698> and when Hmax>30m, Sigma

= 9*10(-6)*n<s><1.8026>. The vertical axis axial-flow kaplan turbine power station cavitation coefficient calculating method issuitable for calculation of the vertical axis axial-flow kaplan turbine power station cavitation coefficient, and can preferably satisfy the new water-power engineering requirement.

Description

technical field [0001] The invention relates to a hydroturbine in a hydropower station, in particular to a calculation method for the cavitation coefficient of a vertical-axis flow-to-paddle hydroturbine power station. Background technique [0002] In a hydropower station equipped with a vertical shaft axial flow paddle turbine, the installation elevation of the turbine is the elevation of the centerline of the guide vane of the turbine, and the suction height of the turbine is the elevation difference from the axis of the runner blade to the tail water level of the power station. Raising the suction height and installation elevation of the turbine can reduce the underwater engineering volume and investment of the main powerhouse; while reducing the suction height and installation elevation of the turbine can improve the cavitation performance of the turbine, which is conducive to the stable operation of the unit and prolongs the service life of the unit. Therefore, how to r...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/0639G06Q50/06
Inventor 董宏成田迅蒋登云孙文彬刘丁
Owner POWERCHINA CHENGDU ENG
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