A dynamic characteristic analysis method aiming at a pump turbine in a load rejection process
A technology of pump-turbine, dynamic characteristics, applied in the direction of machine/engine, mechanical equipment, hydroelectric power generation, etc.
Active Publication Date: 2019-01-25
HARBIN INST OF TECH
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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
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Embodiment 1
[0072] A method for analyzing dynamic characteristics of a pump-turbine during a load shedding process, the method for analyzing dynamic characteristics includes:
[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;
[0074] Step 2: Set the boundary conditions, calculation settings and turbulence model of the five calculation areas of the volute, fixed guide vane, movable guide vane, runner and draft tube in the 3D transient calculation model;
[0075] Step 3: Calculate the runner speed according to the rotor dynamics, and calculate the load shedding transition process based on the runner speed;
[0076] Step 4...
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The invention provides a dynamic characteristic analysis method aiming at a pump turbine in a load rejection process, belonging to the technical field of pump turbine characteristic analysis. At first, the analysis method carry out boundary condition setting and calculation on the unsteady flow field calculation in the load rejection transition process according to the rotor dynamic equation of the pump turbine unit, then the time-frequency characteristics of the external characteristics of the pump turbine and the pressure fluctuation of different parts in the whole basin are analyzed in detail, four special frequency components a, b, c and d which cause the instability of the external characteristics of the pump turbine are obtained, and their excitation source positions are analyzed preliminarily. Then, the inducement of the special frequency components is given from the angle of the external characteristics. Finally, the internal flow field in the transient process of load rejection is analyzed, and the specific reasons for the formation of special frequency components are given from the aspects of vorticity and draft tube flow pattern.
Description
technical field [0001] The invention relates to a dynamic characteristic analysis method for a water pump turbine during a load shedding process, and belongs to the technical field of characteristic analysis of a water 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] The existing characteristic analysis...
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Patent Timeline
Login to View More IPC IPC(8): G06F17/50F03B13/06
CPCF03B13/06G06F30/20Y02E10/20Y02E60/16
Inventor 刘全忠苏文涛夏煜星王兴茹徐科繁
Owner HARBIN INST OF TECH