Si, Q.; Deng, F.; Lu, Y.; Liao, M.; Yuan, S. Unsteady Cavitation Analysis of the Centrifugal Pump Based on Entropy Production and Pressure Fluctuation. Int. J. Turbomach. Propuls. Power2023, 8, 46.
Si, Q.; Deng, F.; Lu, Y.; Liao, M.; Yuan, S. Unsteady Cavitation Analysis of the Centrifugal Pump Based on Entropy Production and Pressure Fluctuation. Int. J. Turbomach. Propuls. Power 2023, 8, 46.
Si, Q.; Deng, F.; Lu, Y.; Liao, M.; Yuan, S. Unsteady Cavitation Analysis of the Centrifugal Pump Based on Entropy Production and Pressure Fluctuation. Int. J. Turbomach. Propuls. Power2023, 8, 46.
Si, Q.; Deng, F.; Lu, Y.; Liao, M.; Yuan, S. Unsteady Cavitation Analysis of the Centrifugal Pump Based on Entropy Production and Pressure Fluctuation. Int. J. Turbomach. Propuls. Power 2023, 8, 46.
Abstract
A numerical method using combined detached-eddy simulation (DES) and cavitation model considering the rotation effect is used for unsteady cavitation flow field of the centrifugal pump. Closed type pump test system was established to obtain the pump performance and pressure pulsation characteristics under different flow rates and cavitation condition, which provide boundary conditions and verification of calculations. Based on the calculation results of the unsteady flow field of the centrifugal pump cavitation, the entropy generation analysis of the flow field and the pressure fluctuation characteristics were carried out. Then the relationship between cavitation and the deterioration of the centrifugal pump performance and the generation of the unstable operation excitation force was tried to reveal. The internal energy loss is mainly concentrated in the impeller, volute, and pump cavity area, which accounts for more than 85% of the total entropy generation. The characteristic frequency of about 0.333 Strouhal Number appears at the volute tongue due to the cavitation flow spread downstream.
Copyright:
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