Study On Impeller Parameter Optimization And Typical Fault Diagnosis Of Centrifugal Pump

As the most commonly used fluid delivery device,centrifugal pumps play an indispensable role in industrial production.In practical applications,due to its complicated internal structure,the fluid in the pump is always in a three-dimensional,viscous and unsteady flow state.The pressure pulsation caused by this unsteady flow is very harmful to the smooth operation of the centrifugal pump.In severe cases,it may even Causes typical failures such as blade breakage.In view of the above problems,this paper takes a single-stage single-suction centrifugal pump as the research object,aiming at improving the flow state of the fluid in the pump and improving the stability and reliability of the centrifugal pump.The optimization of the impeller structure parameters and the blade damage of the centrifugal pump Related research has been carried out on the diagnosis of faults.The specific research contents are as follows.(1)In the hydraulic design of the impeller structure,the importance of improving the fluid flow state in the pump is fully considered,aiming at reducing energy loss,improving the anti-cavitation performance of the impeller and improving the flow state of the fluid in the pump,and establishing optimization.mathematical model.The optimized mathematical model is written into M file,and the variation range of the impeller structure parameters is determined according to the performance requirements of the pump.The genetic algorithm toolbox in Matlab software is used to optimize the mathematical model.After analyzing and optimizing the scheme,the working efficiency,anti-cavitation performance and operational stability of the centrifugal pump are improved to some extent.(2)According to the optimized impeller structure parameters,the structural parameters of the matching volute components are obtained by calculation.The three-dimensional fluid model of the centrifugal pump was established by Pro/E software.The fluid model of the pump was unstructured meshed by ICEM CFD software.Finally,the steady-state numerical simulation and transient numerical simulation of the centrifugalpump were carried out in Fluent software.A pressure distribution cloud map and pressure pulsation data of the internal flow field of the centrifugal pump are obtained.Comparing the pressure pulsation intensity of the flow field in the pump before and after optimization,the results show that the flow state of the fluid in the pump is improved after optimization.(3)A centrifugal pump model with 1/2 breakage faults in the blade was established,and the pressure pulsation data in the flow field under fault conditions was obtained by numerical simulation.The spectrum analysis method is used to analyze the pressure pulsation of normal working conditions and faulty working conditions,and the spectrograms of the pressure pulsating signals of the two working conditions are compared to complete the judgment and identification of the centrifugal pump blade breakage faults.