Influence of impeller-guide vane axial distance on the performance and flow characteristics of the gas-liquid-solid multiphase pump
HU Liwei1, LI Huichuang1, YANG Jiahang1, LIANG Ao1, ZHANG Wenwu1,2
1. College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; 2. Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, Beijing 100083, China
Abstract：[Objective] Multiphase rotodynamic pumps are widely used in multiphase mixed transport processes, including petrochemicals, agricultural irrigation, urban water supply, and drainage, attributed to their advantages of compact structure and good operation under high-speed and high-sand content conditions. The performance of these pumps is crucial for the transport capacity of the mixed transport system; thus, the improvement of their performance has always been a research interest. The impeller-guide vane axial distance of the gas-liquid-solid multiphase pump can seriously affect its transportation performance, but is rarely researched. [Methods] Herein, a multiphase rotodynamic pump with impeller-guide vane axial distances (d) of 8, 10, 12, 14, and 16 mm were modeled via UG-NX. The inlet and outlet pipelines, as well as impellers and guide vanes, were meshed via ICEM-CFD and TurboGrid, respectively. Based on the Euler multiphase flow model, computational fluid dynamics (CFD) numerical simulations were conducted to reveal the influence law of d on the comprehensive performance, including the head, efficiency, pressure, gas void fraction (GVF), solid void fraction (SVF), vorticity, and vortex structure for the gas-liquid-solid multiphase rotodynamic pumps. [Results] The adopted accuracy of the numerical methods was verified through experiments. The numerical results revealed that as d increased from 8 mm to 16 mm, the head and efficiency of the multiphase rotodynamic pump showed an overall decreasing trend; the head and efficiency of the pump declined by 0.45 m and 1.38%, respectively. As d increased from 8 mm to 10 mm, the head and efficiency of the multiphase rotodynamic pump declined by 0.21 m and 0.52%, respectively, which was recorded as performance plummet Ⅰ; as d increased from 10 mm to 14 mm, the head and efficiency of the multiphase rotodynamic pump declined by 0.09 m and 0.12%, respectively—recorded as performance moderation; as d increased from 14 mm to 16 mm, the head and efficiency of the multiphase rotodynamic pump declined by 0.15 m and 0.74%, respectively—recorded as performance plummet Ⅱ. The change in d had a more significant influence on the flow state in the guide vane than that in the impeller. As d increased, the pressure difference decreased from the impeller inlet to the guide vane outlet, GVF at the trailing edge and SVF near the pressure surface at the leading edge of the guide vane blades gradually increased, the vorticity in the multiphase rotodynamic pump increased, and the vortex structure remained prominent, decreasing the overall pump performance. [Conclusions] The increase in d will reduce the head and efficiency of the multiphase pump and make the internal flow more turbulent. However, it will strengthen the rotor-stator interaction if d is exceedingly small. Therefore, the value of d should be selected from the performance moderation in the optimization design of such pumps.
胡丽伟, 李慧闯, 杨佳杭, 梁澳, 张文武. 动静叶间距对气液固混输叶片泵性能及流动特性的影响分析[J]. 清华大学学报（自然科学版）, 2024, 64(8): 1424-1434.
HU Liwei, LI Huichuang, YANG Jiahang, LIANG Ao, ZHANG Wenwu. Influence of impeller-guide vane axial distance on the performance and flow characteristics of the gas-liquid-solid multiphase pump. Journal of Tsinghua University(Science and Technology), 2024, 64(8): 1424-1434.
[1] 张文武,余志毅,李泳江,等.叶片式气液混输泵全流道内流场特性分析[J].机械工程学报, 2019, 55(10):168-174. ZHANG W W, YU Z Y, LI Y J, et al. Flow characteristics analysis for the whole flow passage of a multiphase rotodynamic pump[J]. Journal of Mechanical Engineering, 2019, 55(10):168-174.(in Chinese) [2] 肖业祥,桂中华,张瑾,等.分流叶片对混输泵水力性能影响的优化分析[J].水力发电学报, 2023, 42(4):25-31. XIAO Y X, GUI Z H, ZHANG J, et al. Optimization analysis of effect of splitter blades on flow characteristics of multiphase pumps[J]. Journal of Hydroelectric Engineering, 2023, 42(4):25-31.(in Chinese) [3] 张文武,祝宝山,余志毅.流动参数对混输泵全流道内气液相间作用特性的影响[J].工程热物理学报, 2020, 41(8):1911-1916. ZHANG W W, ZHU B S, YU Z Y. Numerical analysis for the influence of flow parameters on phase interaction in a multiphase rotodynamic pump[J]. Journal of Engineering Thermophysics, 2020, 41(8):1911-1916.(in Chinese) [4] 张文武,余志毅,祝宝山,等.叶顶间隙对低比转速混流泵性能及内部流场影响的数值研究[J].机械工程学报, 2017, 53(22):182-189. ZHANG W W, YU Z Y, ZHU B S, et al. Study of tip clearance effects on performances and flow field of a Low specific speed mixed-flow pump[J]. Journal of Mechanical Engineering, 2017, 53(22):182-189.(in Chinese) [5] WANG J, ZHA H B, MCDONOUGH J M, et al. Analysis and numerical simulation of a novel gas-liquid multiphase scroll pump[J]. International Journal of Heat and Mass Transfer, 2015, 91:27-36. [6] HUA G, FALCONE G, TEODORIU C, et al. Comparison of multiphase pumping technologies for subsea and downhole applications[J]. Oil and Gas Facilities, 2012, 1(1):36-46. [7] ZHANG J Y, CAO S J, LI Y J, et al. Visualization study of gas-liquid two-phase flow patterns inside a three-stage rotodynamic multiphase pump[J]. Experimental Thermal and Fluid Science, 2016, 70:125-138. [8] SUN W H, YU Z Y, ZHANG K W. Effect of shear-thinning property on the energy performance and flow field of an axial flow pump[J]. Energies, 2022, 15(7):2341. [9] ZHANG W W, YU Z Y, ZHU B S. Numerical study of pressure fluctuation in a gas-liquid two-phase mixed-flow pump[J]. Energies, 2017, 10(5):634. [10] 史广泰,王彬鑫,李和林,等.轴向间隙对多相混输泵水力性能的影响[J].石油机械, 2021, 49(12):98-104. SHI G T, WANG B X, LI H L, et al. Effect of axial clearance on hydraulic performance of multiphase pump[J]. China Petroleum Machinery, 2021, 49(12):98-104.(in Chinese) [11] 左世鑫,但玥,马越,等.轴向间隙对多相混输泵内流特性及压力载荷的影响[J].机床与液压, 2021, 49(24):159-164. ZUO S X, DAN Y, MA Y, et al. Effect of the axial clearance on the internal flow characteristics and pressure load of the multiphase pump[J]. Machine Tool&Hydraulics, 2021, 49(24):159-164.(in Chinese) [12] ZHU H W, ZHU J J, LIN Z M, et al. Performance degradation and wearing of electrical submersible pump (ESP) with gas-liquid-solid flow:Experiments and mechanistic modeling[J]. Journal of Petroleum Science and Engineering, 2021, 200:108399. [13] WANG Z N, DENG Y J, PAN Y, et al. Experimentally investigating the flow characteristics of airlift pumps operating in gas-liquid-solid flow[J]. Experimental Thermal and Fluid Science, 2020, 112:109988. [14] DEENDARLIANTO, SUPRABA I, MAJID A I, et al. Experimental investigation on the flow behavior during the solid particles lifting in a micro-bubble generator type airlift pump system[J]. Case Studies in Thermal Engineering, 2019, 13:100386. [15] 闫重阳,张宇飞,陈海昕.基于离散伴随的流场反演在湍流模拟中的应用[J].航空学报, 2021, 42(4):524695. YAN C Y, ZHANG Y F, CHEN H X. Application of field inversion based on discrete adjoint method in turbulence modeling[J]. Acta Aeronautica et Astronautica Sinica, 2021, 42(4):524695.(in Chinese) [16] ZHANG W W, HU L W, LI H C, et al. Numerical analysis of bubble size effect in a gas-liquid two-phase rotodynamic pump by using a bubble coalescence and collapse model[J]. Chemical Engineering Research and Design, 2023, 191:617-629. [17] 唐学林,赵旭红,李云开,等.迷宫流道滴头内流场和颗粒运动的不同湍流模型数值模拟[J].农业工程学报, 2018, 34(16):120-128. TANG X L, ZHAO X H, LI Y K, et al. Numerical simulation of flow fields and particle movement characteristics in labyrinth channel emitter using different turbulence models[J]. Transactions of the Chinese Society of Agricultural Engineering, 2018, 34(16):120-128.(in Chinese) [18] 资丹,王本宏,王福军,等.开机组合对泵站进水系统泥沙浓度分布的影响[J].农业工程学报, 2022, 38(7):59-68. ZI D, WANG B H, WANG F J, et al. Influences of start-up pump units on the sediment concentration for the intake system of a pumping station[J]. Transactions of the Chinese Society of Agricultural Engineering, 2022, 38(7):59-68.(in Chinese) [19] YU Z Y, ZHU B S, CAO S L. Interphase force analysis for air-water bubbly flow in a multiphase rotodynamic pump[J]. Engineering Computations, 2015, 32(7):2166-2180. [20] LI D Y, QIN Y L, ZUO Z G, et al. Numerical simulation on pump transient characteristic in a model pump turbine[J]. Journal of Fluids Engineering, 2019, 141(11):111101. [21] LI C, LI X F, SU Y X, et al. A new zero-equation turbulence model for micro-scale climate simulation[J]. Building and Environment, 2012, 47:243-255. [22] LI H C, ZHANG W W, HU L W et al. Studies on flow characteristics of gas-liquid multiphase pumps applied in petroleum transportation engineering-A review[J]. Energies, 2023, 16(17):6292. [23] ZHANG W W, XIE X, ZHU B S, et al. Analysis of phase interaction and gas holdup in a multistage multiphase rotodynamic pump based on a modified Euler two-fluid model[J]. Renewable Energy, 2021, 164:1496-1507. [24] 刘大有.二相流体动力学[M].北京:高等教育出版社, 1993. LI D Y. Fluid dynamics of two-phase systems[M]. Beijing:Higher Education Press, 1993.(in Chinese) [25] ZHANG W W, YU Z Y, ZAHID M N, et al. Study of the gas distribution in a multiphase rotodynamic pump based on interphase force analysis[J]. Energies, 2018, 11(5):1069. [26] FU W S, LAI Y C, LI C G. Estimation of turbulent natural convection in horizontal parallel plates by the Q criterion[J]. International Communications in Heat and Mass Transfer, 2013, 45:41-46.
2024, Vol. 64 
