A physical model test was adopted to study the characteristics of pressure fluctuation of reversible pumping system for irrigation and drainage by performance and cavitation test.Three measu-ring points were arranged in front-end of inlet passage,the back-end of discharge passage and outlet of guide vane.The results show that the maximum relative amplitudes of pressure fluctuation at front-end of inlet passage,the back-end of discharge passage and outlet of guide vane were 0.22,1.10 and 1.20 respectively.With the increase of flow rate,the relative amplitude of pressure fluctuation increased in the front-end of inlet passage and the back-end of outlet passage,while the relative amplitude decreased first and then increased in outlet of guide vane.In the cavitation test the relative amplitude of pressure at outlet of guide vane increased when the intake pressure decreased to a certain value.The relative amplitudes of pressure fluctuation at the measuring points under different rotational speed varied with the lifting head in the same trends.For the same head,the relative amplitude increased with the increase of rotation speed in the front-end of inlet passage and the back-end of discharge passage,while no significant regularity was found in the relationship of outlet of guide vane and variation speed.
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