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Method for constructing total characteristic curve of pump turbine

A full characteristic curve, pump turbine technology, applied in special data processing applications, instruments, calculations, etc., can solve problems such as difficult to accurately express characteristic curves, low adaptability of pump turbines, and complex flow state of runners

Active Publication Date: 2014-06-18
WUHAN UNIV
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Problems solved by technology

However, the internal flow state of the runner is very complicated, and the simplified physical model is difficult to accurately express the characteristic curve
The existing calculation methods are very limited, and can only calculate partial curves in the full characteristic curve, and are mainly suitable for Francis turbines, and are not highly adaptable to pump turbines
[0009] The above three methods have their own advantages and disadvantages, and the prerequisites are that some or detailed parameters of the pump turbine are known.

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  • Method for constructing total characteristic curve of pump turbine
  • Method for constructing total characteristic curve of pump turbine
  • Method for constructing total characteristic curve of pump turbine

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[0031] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.

[0032] please see figure 1 , which is the traditional full characteristic curve partition and coordinate intersection line of the present invention, the traditional expression form of the full characteristic curve is very complicated, when the unit speed is 100 (m 0.5 / s) around, there is a multi-valued phenomenon. Such an expression is not conducive to the mathematical operation of the full characteristic curve. The traditional transformation method is to treat the full characteristic curves as a whole and adopt a unified transformation equation to elimina...

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Abstract

The invention provides a method for constructing a total characteristic curve of a pump turbine. By the adoption of a mathematical manipulation method and with the combination of mathematical statistic knowledge, the total characteristic curve at any specific speed is obtained according to existing total characteristic data with the specific speed which is the characteristic parameter of the pump turbine as a standard interpolation. The premise of construction of the total characteristic curve includes the steps of collecting a set of data containing total characteristic curves at different specific speeds, and finally achieving construction of the total characteristic curve at any specific speed according to rule research, mathematical manipulation and mathematical statistic analysis of the collected data and by means of a four-dimensional interpolation method. The method is suitable for early-stage design of a pumped storage station and particularly suitable for early-stage adjustment assurance design of the pumped storage station when total characteristic data of the pump turbine are lacked.

Description

technical field [0001] The invention belongs to the field of hydraulic mechanical characteristic research, and relates to a method for constructing a full characteristic curve of a water pump turbine, in particular to a method for constructing a full characteristic curve of a water pump turbine based on multi-interval mathematical transformation and mathematical statistics. Background technique [0002] The pumped storage power station has the function of energy storage and power generation, which effectively adjusts the dynamic balance problem of power system generation, supply and demand. In recent years, with the increasing capacity of the power grid, the difference between peak and valley has become more and more obvious, the problems of power system balance and frequency control have become increasingly prominent, and the significance of pumped storage power stations with energy storage functions has become more and more obvious. The pump-turbine is the key equipment of...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 曾威杨建东程永光刘艳娜杨桀彬
Owner WUHAN UNIV
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