含气率对深海多相混输泵性能影响的数值研究  

Numerical Study on the Effect of Gas Void Fraction on the Performance of Deep-Sea Multiphase Pump

作　　者：杨晨宇 徐强[1] 常亮[1] 郭烈锦[1] YANG Chen-Yu;XU Qiang;CHANG Liang;GUO Lie-Jin(State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《工程热物理学报》2021年第6期1479-1485,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51888103、No.52076175)。

摘　　要：本文采用CFD数值模拟方法对全新自主设计的混流式深海多相混输泵,分别在单相纯水与空气-水两相工况下开展数值模拟计算工作。单相条件下研究了混输泵在3000 r·min^(-1)、3500 r·min^(-1)与4000 r·min^(-1)三种转速下的增压特性与水力效率随液相流量Q_(1) 变化规律;两相条件下对混输泵进行了恒定液相流量Q_(1) 改变混输泵入口体积含气率GVF与恒定GVF改变Q_(1) 的两相增压性能预测,GVF变化范围为0~10%,Q_(1) 变化区间为5~90 m3/h。研究结果表明GVF在10%以内,该混流式混输泵空气-水两相混输增压性能良好,能够保持安全高效稳定运行,发现扩压器入口处导叶叶片吸力面局部区域气体积聚是导致混输泵增压性能随GVF增加而轻微下降的主要原因。In this paper,the CFD numerical simulation method is used to carry out the numerical simulation of the fire new self-designed deep-sea mixed-flow multiphase pump under the single-phase pure water and air-water two-phase conditions respectively.Under the single phase condition,the pressurization characteristic and hydraulic efficiency of the multiphase pump at three speeds of 3000 rpm,3500 rpm and 4000 rpm are studied with the change of liquid flow Q_(1).Under the two-phase condition,the two-phase pressurization performance of the multiphase pump with constant liquid flow Q_(1) changing the inlet volume gas void fraction GVF and constant GVF changing Q_(1) is predicted.The range of GVF is 0~10%,and the range of Q_(1) is between 5 m~3/h and 90 m~3/h.The results show that the mixed-flow multiphase pump has a good pressurization performance and can maintain safe,efficient and stable operation when the GVF is less than 10%in the air-water two-phase conditions.It is found that the gas accumulation near the local area of suction surface of guide vane at the inlet of diffuser is the main reason that the pressurization performance of the mixed-flow multiphase pump decreases slightly with the increase of GVF.

关 键 词：混流式深海多相混输泵 空气-水两相流 入口体积含气率GVF CFD数值模拟 

分 类 号：O359[理学—流体力学]