| A new type of axial flow energy turbine was studied which based on the commercial software ANSYS Workbench platform of a number of modules,design and calculation process,Analysis of FSI method and parametric design method of turbine impeller.The research focuses on the three aspects of the pressure pulsation,the fatigue of the impeller and the optimization of the turbine impeller.Firstly,based on single and bidirectional FSI method,three dimensional numerical simulations is carried out for the impeller of horizontal axis tidal current energy turbine.Unsteady flow around the flow field around the turbine is studied,concluding that the strain characteristics of the impeller of the water turbine,water pressure fluctuation of each monitoring point and frequency domain vibration under three different working conditions.Secondly,based on the ANSYS Workbench platform,using the combination of FSI and fatigue life simulation,the fatigue life of turbine blade is analyzed,which greatly simplifies the calculation of fatigue life.The FSI method allows for data transfer through interaction between the fluid and solid.fundamentally,solve the difficulty in the blade of a curved surface loading fatigue and decrease the error caused by method of equivalent substitution calculation during fatigue loading.The dynamic stress of the dangerous point on the turbine blade during the transient process is extracted,and then converted into equivalent stress after loading for the dynamic stress time course to solve the calculation.Finally,rotational moment of inertia,rotational speed,and the speed of the turbine are combined together by the optimization algorithm,which provides the design basis for the design of the water turbine.At the same time,it can optimize the energy utilization efficiency of the water turbine as a whole,maximize the efficiency,reduce the use cost,and improve the overall performance of the hydraulic turbine with the suspension horizontal axis. |
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