Investigation of the impact of rotor- stator matching modes on the pressure pulsations of the guide vane centrifugal pump

The main source of intense pressure pulsation during the operation of a guide vane centrifugal pump is the rotor-stator interaction, which is directly related to the matching modes of the impeller and guide vane. In order to grasp the influence of different impeller/vane matching modes on the pump pressure pulsation, this study designs three different guide vanes and investigates the complex pressure pulsations through experimental tests. Besides, the complex internal flow structure of the pump is also explored based on the numerical computation means of DDES to reveal the typical flow field of this type of centrifugal pump. The findings of the experiment demonstrate that the blade passing frequency remains the dominant frequency in the pressure pulsation spectrum even under various rotor-stator matching modes. The DY8 and DY9 pumps are shown to be able to significantly reduce the pressure pulsation energy caused by rotor-stator interaction at the design and high flow conditions based on the amplitude of the blade passing frequency and the RMS value within the 0-1000 Hz frequency region. The impeller output surface forms a notable jet-wake flow pattern, as seen by the numerical findings, which also characterize the high and low flow zones. Both the guide vane and the impeller create typical vortical structures, and as the impeller rotates, the impeller's vortex will interact with the guide vane. Choosing a larger number of guide vane blades during the pump design is advised in light of the decreased rotor-stator contact.