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| Theoretical prediction model of gas-phase diameter in multiphase pump based on Weber number |
| LIU Ming,TAN Lei,CAO Shuliang |
| 1. Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China; 2. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, 100084, China |
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Abstract In order to determine an appropriate value of gas-phase diameter to guarantee the simulation accuracy of gas-liquid flow inside multiphase pumps, from Weber number, which is a vital dimensionless value for bubble size, the relationship between gas-phase diameter and rotation speed, flow rate, gas volume fraction was established based on critical Weber number, and a theoretical prediction model for gas-phase diameter in multiphase pumps was proposed. The theoretical prediction model was applied in a three-stage rotodynamic multiphase pump. Under a total of 20 operating conditions of various flow rates and inlet gas volume fraction, the values of gas-phase diameter for numerical simulation were calibrated according to experimental results, and the empirical factors in the theoretical prediction model were fitted. Finally, the average deviation between prediction and calibration values of gas-phase diameter was 7.28% According to the analysis of the distribution of gas-phase diameter and Weber number on the meridional passages inside the multiphase pump, the regions with high values of gas-phase diameter and Weber number are specified. It is also found that the gas phase of high volume fraction in the impeller passage will flow and develop along with the mainstream, but will gather to form a low-velocity pocket and block the passage of diffuser. The research results are helpful to improve the accuracy of two-phase numerical simulation of multiphase pump.
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Received: 16 December 2021
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