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Method for analyzing dynamic characteristic and internal flow characteristic of pump turbine in runway transient process

A pump-turbine, transition process technology, used in machines/engines, mechanical equipment, hydroelectric power, etc.

Inactive Publication Date: 2019-01-25
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a lack of research and analysis on the frequent switching between working conditions, the characteristics of pressure fluctuations and the evolution of various special flows in the continuous process of the pump-turbine transition process.
The research on the transition process of hydraulic turbines focuses more on how to use CFD numerical simulation to accurately realize the transient transition process of hydraulic turbines and study the internal and external characteristics of hydraulic turbines during transient transitions. In fact, the internal and external characteristics of hydraulic turbines during transient transitions will occur violently. changes, the causes of these changes have rarely been analyzed

Method used

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  • Method for analyzing dynamic characteristic and internal flow characteristic of pump turbine in runway transient process
  • Method for analyzing dynamic characteristic and internal flow characteristic of pump turbine in runway transient process
  • Method for analyzing dynamic characteristic and internal flow characteristic of pump turbine in runway transient process

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Embodiment 1

[0072] A method for analyzing the dynamic characteristics and internal flow characteristics of a pump-turbine during a runaway transition process, the analysis method comprising:

[0073] Step 1: Establish a three-dimensional transient calculation model of the pump-turbine with the volute, fixed guide vane, movable guide vane, runner and draft tube as the calculation areas, and use the mesh division method to calculate the calculation domain of the three-dimensional transient calculation model Carry out discretization, and determine the number of grid nodes through grid independence verification; finally select a hybrid grid with 6.62 million nodes for subsequent three-dimensional transient calculations, so as to realize that the simulated water head has a clear trend of change;

[0074] Step 2: Use the CFD numerical simulation method to simulate the transient runaway transition process of the pump turbine, and obtain the change curve of unit speed and unit flow rate, the stati...

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Abstract

The invention provides a method for analyzing the dynamic characteristic and internal flow characteristic of a pump turbine in the runway transient process, and belongs to the technical field of pumpturbine characteristic analyzing. According to the method, a CFD numerical simulation method is utilized for simulating the instantaneous transient process, and the change law of unit parameters and the external characteristic is determined. Through transient calculation in the runway transient process, the change law of flow-field pressure fluctuation at all components of the pump turbine with time is acquired, and the frequency components and source of the flow-field pressure fluctuation are concretely analyzed through the fast Fourier transform and the short-time Fourier transform. The pressure of a drainage basin and the flow-state evolution process in the runway transient process within a period are analyzed, and the forming reason of special frequency components is explained from thevorticity angle.

Description

technical field [0001] The invention relates to a method for analyzing the dynamic characteristics and internal flow characteristics of a pump turbine during a runaway transition process, and belongs to the technical field of characteristic analysis of a pump turbine. Background technique [0002] The most important part of the pumped storage power station is the pump-turbine. Due to the dual roles of the pump and the turbine, the pump-turbine will experience a complicated transition process during operation. The research on the transition process of the pump-turbine in my country started late, and the transition process The characteristic of the pumped storage power station is one of the key factors to measure the stability of the pumped storage power station, so in-depth research on the transition process of the pump turbine is very important for the optimal design of the pump turbine, safe and stable operation and full play of its economic benefits. significance. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03B15/00F03B13/06G06F17/50
CPCF03B13/06F03B15/00G06F30/367Y02E10/20Y02E60/16
Inventor 刘全忠苏文涛夏煜星王兴茹徐科繁
Owner HARBIN INST OF TECH
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