Abstract
Pumps as turbines are widely used in the world, wherein the hydraulic thrust of a turbine pump is one of the key factors affecting the safe and stable operation of a unit. There are a lot of difficulties to evaluate the hydraulic thrust by site observation and experiment. These difficulties can be resolved if a numerical simulation is applied. The present work aims to analyze the axial and radial hydraulic thrust of a prototype turbine pump in turbine mode, and then to determine the dynamic response characteristics of the turbine pump shafting. The axial hydraulic thrust in the turbine mode is upward, with a fluctuation range of 155 t to 175 t. The pressure fluctuation in the runner can be 16% of the unit head. The simulation results provide a good reference for understanding the hydraulic performance of the turbine pump and useful guidance for the operation of the unit. The structure analysis shows that the runner has asymmetrical deformation in the axial and radial directions. The amplitude of the dynamic stress on the shafting is about 10 MPa, and the dominant frequency of the dynamic stress on the runner is 20fn. The results could provide guidance for the operating and optimization of the unit, which helps the safe and stable operation of the station.
Highlights
IntroductionPumps as turbines are widely used in engineering due to their safety and stability. The Chinese government announced that China will achieve the goal of peaking carbon by
Pumps as turbines are widely used in engineering due to their safety and stability.The Chinese government announced that China will achieve the goal of peaking carbon by2030 [1], which means the use of renewable energy will be increased greatly in the future.renewable energy, such as wind energy and solar energy, is not stable enough.the pumped-storage power plant plays a significant role in the grid system [2]
The results in this paper are helpful for understanding the hydraulic thrust performance of the turbine pump in the turbine mode, and for revealing the dynamic characteristics of the turbine pump shafting under the effect of the hydraulic excitation, Energies 2022, 15, 1580 which can be used to guide the operation of the unit and to assure the safe and stable operation of the unit
Summary
Pumps as turbines are widely used in engineering due to their safety and stability. The Chinese government announced that China will achieve the goal of peaking carbon by. The numerical study on the axial and radial hydraulic thrust of the turbine pump is important for the stable operation of the unit. The rated operating condition under turbine mode is selected for the numerical simulation to analyze the radial and axial hydraulic thrust of a prototype turbine pump and the pressure fluctuations in the flow passage, and the relationship between the unit component and the fluctuation is discussed. The hydraulic pressure on the fluid-structure interaction (FSI) interface is applied to the FEM model, and the dynamic response of the shafting is calculated Both the deformation and the dynamic stresses are analyzed. The results in this paper are helpful for understanding the hydraulic thrust performance of the turbine pump in the turbine mode, and for revealing the dynamic characteristics of the turbine pump shafting under the effect of the hydraulic excitation, Energies 2022, 15, 1580 which can be used to guide the operation of the unit and to assure the safe and stable operation of the unit
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