Abstract: The formula of inlet shock loss under week sun radiation was derived. The location and extent of secondary flow caused by speed reduction were analyzed. The effects of sawtooth waving and continuous changing of radiation on the flow field were discussed. Based on Reynolds timeaveraged Navier-Stokes equation and standard k-ε turbulence model, a selfdesigned photovoltaic centrifugal pump was simulated by computational fluid dynamics software of Fluent and SIMPLEC method under four kinds of radiation and tested by experiment. The results of calculation and experiment show that the inlet shock loss is mainly determined by square of circumferential velocity. The forward and reverse alternated oscillation pulse in flow field can lead to pressure disturbance waves and rarefaction waves. With the radiation decreasing, the shock loss first appears at the inlet and gradually evolves into a whirlpool in the same direction of the rotation. The outlet disturbance lags behind inlet one.It occurs near the blade suction side first,and then develops to the next blade pressure side rapidly.
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