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]。由于压裂液中携带大量的支撑剂颗粒，使离心泵长时间在固液两相流环境中工作，故颗粒与流体之间的相互作用、颗粒之间以及颗粒过流部件壁面的碰撞均会影响离心泵外特性及振动状态。而离心泵中叶轮与蜗壳之间的相互干扰会造成泵内流动不稳定，使得泵运行过程中发生振动、噪声等现象，影响泵的安全稳定运行[3-7]。为减小离心泵的振动损耗，国内外学者对泵的流致振动进行了广泛研究。

程伟等[8对离心泵的隔舌区域进行了重点研究，发现不同工况下流道各监测点的主频均出现在1倍叶频处，且随监测点与隔舌周向距离的变大，其压力脉动幅值逐渐减小。王业芳等[9-10]采用分离涡模拟的方法，对低比转数离心泵进行了非定常数值计算，得到了不同小流量工况下，叶轮与蜗壳内部压力脉动频率的变化特点。张宁等[]采用试验的手段，对低比转速离心泵的压力脉动频谱特性进行了试验研究，得到了离心泵蜗壳的压力脉动频谱特性。任蔼琳等[]对低比转速离心泵工作时，叶片周期性经过隔水角产生动静干涉导致泵体振动进行了研究。张忆宁等[3研究了离心泵叶片出口安放角对两级矿用潜水离心泵压力脉动及径向力的影响，结果表明，叶轮与蜗壳之间的动静干涉等会使泵的出口压力产生周期性变化，压力脉动强度与叶轮结构有关。……