混砂泵固液两相流流致振动仿真分析

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DaiQiping，Sun Tianhui，Peng Junwei，etal.Simulation analysisof vibration induced bysolid-liquid two-phase flow in sand mixing pump[J].China PetroleumMachinery，2O25，53（6）：117-124.

Simulation Analysisof Vibration Induced bySolid-Liquid Two-Phase Flow in Sand Mixing Pump

Dai Qiping1，²Sun Tianhui³Peng Junwei1，²Dong Fuqiang1.²Li Sen 1，2 Zhou Qing1²Tang Xiao 1，2 （1.CNPCNationalPetroleumDrilingEquipmentEngineringTchnologyResearchCenteCompanyLimited;2.CNPCBajiOilfieldMachineryCo.，Ltd.；3.ChinaUniversityofPetroleum（Beijing））

Abstract：Due to harsh working environment，vibration failure often occurs in sand mixing pump for hydraulic fracturing.To solve this problem，a CFD-DEM coupling calculation method was used to build asolid-liquid two-phase flow simulation model.Under the condition of different impeller speeds，flow rates，particle sizes and sand mixing concentrations，the influence of external characteristics of centrifugal pump under solid-liquid twophase flow condition was analyzed.Meanwhile，thefluid forces acting onthe volute and impellerof thecentrifugal pump in the x ， y and z directions were monitored and analyzed，and the power spectral density curves of the volute and impeller in the x ， y and z directions were obtained using the periodogram method. The research results show thattheaddition of particle phase leads toa decrease inthe delivery headand eficiencyofcentrifugal pump.The main vibration directions of the impeller and volute aretheaxial direction of the impellerand theoutlet directionof the voluterespectively，andthe main vibrationfrequency is the blade frequency.The impeller speed and flowrate are the main factors affcting the vibration power of centrifugal pump：every time the impeller speed rises by 100r/ （20 min，the main vibration power of the impeller and volute is increased by 36. 15% and 37. 71% respectively， every time the flow rate increases by 3.78m3/min ，the main vibration power of the impeller is increased by 28. 45% on average，and that of the volute decreased by 11. 27% on average. The influence of sand concentration and particle size on vibration is relatively small.

Keywords：sand mixing pump；solid -liquid two-phase flow；CFD-DEM；power spectral density；flov induced vibration

0 引言

混砂泵作为重要的压裂液输送设备，因其具备高流量和高输出功率等特点，在油田的压裂作业中起到重要作用[1-2]。（剩余11703字）