Analysis on characteristics of unsteady pressure pulsation in radial diffuser multi-stage pump
In this article,in order to explore the characteristics of the unsteady pressure pulsation in the radial diffuser multi-stage pump under different flow conditions,the MD500-57×3 radial diffuser multi-stage pump is chosen;under three flow condi-tions of 0.5Q,1.0Q and 1.2Q,the ANSYS Fluent software is used to numerically calculate the pump's fluid calculation domain.By comparing the results obtained from the numerical calculation with those obtained from the experiments,it is verified that this method of numerical calculation and the simulation results are correct and feasible.Then,the analysis is conducted on the charac-teristics of the unsteady pressure pulsation at each impeller's inlet and outlet as well as the inside of each diffuser.The results show that the main frequency of the fluid pressure pulsation at each impeller's inlet in the radial diffuser multi-stage pump is the impel-ler's blade frequency,which is mainly affected by the impeller's rotation.The pressure pulsation at each impeller's outlet is af-fected by the combined effect of the incoming flow and the impeller's rotation.There are several high-frequency signals with multi-ple frequencies of the shaft frequency as the frequency,and the stability of the flow field inside the pump affects the propagation and diffusion of the pressure-pulsation source.The fluid at each diffuser's inlet is most strongly affected by the impeller's rotation,while the fluid pressure along the flow path of the diffuser gradually stabilizes.However,with the ever-growing pump stages,the fluid pressure inside the diffuser is induced to produce high-frequency components by the rotary impeller and its counterparts.
radial diffuser multi-stage pumpnumerical simulationpressure pulsationunsteady flowanalysis on time frequency
NETL
NSTL
万方数据
