Calculation method of rated specific speed of vertical shaft water bucket turbine

Abstract

The invention relates to the field of water turbines in hydropower stations, and discloses a method for calculating the rated specific speed of a vertical shaft water bucket water turbine, which can more reasonably calculate the rated specific speed of the vertical shaft water bucket water turbine to meet new hydropower engineering requirements. The invention is summarized as follows: determine the rated water head H of the vertical shaft water bucket turbine to be calculated r ;Determine the number of nozzles Z of the vertical shaft water bucket turbine to be calculated 0 ;Select the corresponding calculation formula according to the number of nozzles of the vertical shaft water bucket turbine, and calculate the rated specific speed n of the single nozzle sr1 , the calculation formula of the rated specific speed of a single nozzle is as follows: When Z 0 = 4, when Z 0 = 5, when Z 0 When =6, calculate the rated specific speed n according to the rated specific speed of the single nozzle sr , that is, the present invention is suitable for the calculation of the rated specific rotational speed of the vertical shaft water bucket water turbine, and can better meet the requirements of new hydropower projects.

Description

technical field [0001] The invention relates to the field of water turbines in hydropower stations, in particular to a method for calculating the rated specific rotational speed of a vertical shaft water bucket water turbine. Background technique [0002] A hydraulic turbine refers to a machine in a hydropower station that converts the mechanical energy of the water flow into the mechanical energy of the runner, so that the runner and the main shaft can overcome various resistances and run continuously. It is called the "heart" of the hydropower station. The initial investment and the economic benefit of the power plant after it is put into operation play a very important role and are one of the core contents of the hydropower engineering design. [0003] The specific speed of the turbine is a comprehensive index to measure the energy characteristics, cavitation characteristics, operation stability, economy and advancement of the turbine. Increasing the specific speed is of...

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Problems solved by technology

because figure 2 The sample data of turbine parameters on which the statistical curves are based are hydropower stations and turbines before 1983, which has certain limitations of the times, and does not consider the influence of different nozzle numbers on the selection of specific speed of turbines and the comprehensive performance of turbines, so it cannot meet the requirements of hydropower projects for new hydropower projects. Technology, new materials, new processes, new structures and other requirements of continuous development, check figure 2 The obtained rated specific speed n of the single nozzle of the vertical shaft bucket turbine sr1 It is generally difficult to meet the requirements of new hydropower projects, so the final calculated rated specific speed according to the existing method has a large error compared with the actual data of the existing vertical shaft bucket water turbine

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