变工况下双吸泵作透平叶轮流固耦合特性OA

To investigate the effects of various operating conditions on the stress,strain and vibration characteristics of double-suction pump as turbines,a specific end-cover type double-suction pump as turbine was selected as the research subject.The numerical calculations were performed to evaluate fluid-structure coupling characteristics under three flow conditions.First,experiments were conducted to gather hydraulic characteristic data for the pump as turbine under each flow condition.At the same time,steady-state calculations of the pump as turbine were carried out using CFX to predict its per-formance and confirm the accuracy of the numerical method.Then,one-way fluid-structure coupling calculations were performed using Workbench to analyze the stress and strain distribution of the impeller and blades across different flow conditions.Finally,modal analysis was conducted to study the vibration characteristics of the impeller.The results show that maximum blade deformation occurs at the inlet and decreases along the flow passage,increasing with flow rate.The greatest total deformation of the impeller takes place at the inlet cover plate area,while the maximum equivalent stress is found at the blade inlet edge and its junction with the cover plate.Both the maximum equivalent stress and total deformation of the impeller grow with higher flow rates.Additionally,the equivalent stress fluctuations of the impeller under high flow conditions are more significant than under low flow conditions,demon-strating clear periodicity.These findings offer valuable insights for the optimal design of double-suction pump as turbines.