Abstract
In order to study the pressure pulsation characteristics of a centrifugal pump with a guide vane, a pump with specific speed ns= 190 was chosen as the research object. The numerical simulation was carried out using the standard k-ε turbulence model. The pressure pulsation characteristic was researched at a set monitoring point. The reliability of the numerical simulation was verified with experiment results. The pressure pulsation characteristic curves of each calculation domain were obtained by dimensionless data processing. The results elucidate that the rotor/stator interaction at the outlet of the impeller is the main source for the pressure pulsation. With increasing distance, the pressure pulsation gradually decreases; the pressure pulsation amplitude of the pressure surface is larger than the suction surface; the pressure pulsation in the flow channel of the guide vane remains the same; the pressure fluctuation near the outlet of the annular volute chamber is larger, and the pressure pulsation near the upstream of the flow channel is quite complicated. The pressure pulsation at the annular volute and axial symmetry is the same.
Highlights
The rotor/stator interaction in centrifugal pumps and the inhomogeneous flow of impeller are the main sources of pressure pulsation
The results show that the pressure pulsation in the design condition is smaller than that in the off-design conditions and the radial force of the impeller varies with time
Where p is the static pressure of the monitoring point. is the average static pressure for a rotation period of impeller and u is the circumferential velocity of the impeller
Summary
The rotor/stator interaction in centrifugal pumps and the inhomogeneous flow of impeller are the main sources of pressure pulsation. The parameters of the impeller, the guide vane and the clearance between the impeller and volute have an important impact on the pressure pulsation and radial force. The results show that the clearance between the volute tongue and the impeller has a great influence on the pressure pulsation. Majidi [12] investigated the internal flow field of the centrifugal pump by a numerical simulation method and found that the pressure pulsation at the impeller outlet and in the volute interior are larger. Yang and other scholars [13,14,15,16] studied the effect of the volute structure on the pressure pulsation and the radial force of centrifugal pumps.
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