Adopting the Reynolds averaged Navier-Stokes equation and RNG k-ε turbulent model, the unsteady flow in the double channel pump is simulated with sliding mesh technique. Detecting points in the impeller and volute passages are to capture the pressure fluctuation law at different time. The pressure fluctuation around the outlet of the volute is measured by pressure transducer, then the frequency domain pattern under different conditions comes out. With the Fast Fourier transform (FFT) analysis, the pressure changing law of time domain at the outlet of the volute is investigated under different operating conditions. It shows that the pressure fluctuation in the volute differs under different conditions. The pressure changing law obtained by the numerical simulation at the outlet of the volute accords with the measurement results. Also the pressure fluctuation at the outlet of the volute is closely related to the interaction between impeller and volute.

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