Effect of Matching Parameters Between Impeller and Guide Vane Width on Pressure Pulsation Characteristics of LNG Pump
Based on CFD technology,the influence of the width matching design of impeller and guide vane on the pressure pulsation characteristics of LNG submersible pump is studied,and the width matching design is carried out.The multi working condition numerical simulation is carried out by using k-epsilon turbulence model,and the dimensionless parameter R(Impeller outlet width/Guide vane inlet width)is introduced to analyze the results.The external characteristics of the pump are analyzed and verified,and the pressure pulsation characteristics of LNG pump in time and frequency domain are obtained.The results show that the main frequency of pressure pulsation is the blade frequency of impeller,and the secondary frequency is its double frequency.The time domain peak is related to the relative position of the monitoring point.The closer to the interface,the greater the time domain peak.The pulsation amplitude first increases and then decreases with the pump width.
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