Abstract In order to analyze the influence of D2(101, 103 and 105mm)on pressure pulsation under partial conditions, the unsteady solid-liquid two-phase flow of the double-channel sewage pump was numerically simulated by using the Mixture multiphase flow model, and the results were verified perfectly by experiment.The partial condition mainly includes small flow rate of 0.6Qd and large flow rate of 1.2Qd. The results showed that the pressure pulsation of volute circumference under 0.6Qd generally increased with the increase of D2, and the maximum increase reached 53.2% when the impeller dia-meter increases from 103 mm to 105 mm, while except points VP3, VP6and VP7, the pressure pulsation of volute circumference under 1.2Qd increased slightly with the increase of D2.The pressure pulsation of volute circumference varies severely with angle change under 0.6Qd and 1.2Qd.The smaller impeller diameter is contributed to reduce the pressure pulsation in the pump under 0.6Qd and 1.2Qd. Instantaneous static pressure of each monitoring point around the tongue in all solid-liquid two-phase flow conditions fluctuates sharply when D2 is 105 mm. For each monitoring point near the tongue under the solid-liquid two-phase flow, the dominant frequency of pressure pulsation under 0.6Qd usually is of the low frequency, while the dominant frequency under 1.2Qd is of the blade passing frequency, the pressure pulsation maximum amplitude of these points basically increased with the increase of D2 under 1.2Qd. The research results provide the basis for the optimization design of double-channel sewage pump.
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