Rated ratio rotating speed calculation method for horizontal shafg single-rotating-wheel double-nozzle bucket type water turbine

Abstract

The invention relates to the field of hydropower station water turbines, and discloses a rated ratio rotating speed calculation method for a horizontal shaft single-rotating-wheel double-nozzle buckettype water turbine, which is used for more reasonably calculating the rated ratio rotating speed of the horizontal shaft single-rotating-wheel double-nozzle bucket type water turbine so as to meet the requirements of new hydropower engineering. The method comprises the following steps: determining a rated water head Hr of a to-be-calculated horizontal shaft single-runner double-nozzle bucket turbine; calculating the rated specific speed of a single nozzle according to a rated specific speed calculation formula of the single nozzle of the horizontal shaft single-runner double-nozzle bucket turbine; and calculating the rated ratio rotating speed nsr of the horizontal shaft single-rotating-wheel double-nozzle bucket water turbine according to a rated ratio rotating speed calculation formulaof the horizontal shaft single-rotating-wheel double-nozzle bucket water turbine. The method is suitable for calculating the rated specific speed of the horizontal shaft single-runner double-nozzle bucket turbine.

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 speed of a horizontal-axis single-runner double-nozzle bucket type water turbine. Background technique [0002] A hydro turbine is 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 run continuously against various resistances. 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 it is one of the core contents of hydropower engineering design. A hydropower station equipped with a horizontal-axis single-runner double-nozzle bucket-type water turbine engine set has the advantages of simple structure of the unit and plant, small civil engineering workload, short construction...

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Problems solved by technology

because figure 2 The turbine parameters sample data on which the statistical curve is based are hydropower stations and turbines before 1983, which have certain era limitations, and have not considered the impact of different numbers of runners and nozzles on the selection of the specific speed of the horizontal-axis bucket type turbine and the comprehensive performance of the turbine. Therefore, it cannot meet the continuous development requirements of hydropower projects for new technologies, new materials, new processes, and new structures. figure 2 The obtained horizontal axis single runner double nozzle bucket type turbine single nozzle rated specific speed n 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 horizontal-axis single-runner double-nozzle bucket water turbine

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