叶片倾斜角对油气混输泵性能的影响  

Effect of Blade Inclined Angle on the Performance of Oil-gas Mixed Pump

作　　者：马希金[1,2] 张亚琼 张潮 崔生磊 MA Xijin;ZHANG Yaqiong;ZHANG Chao;CUI Shenglei(College of Energy and Power Engineering,Lanzhou Univ. of Tech.,Lanzhou 730050 China;Key Laboratory of Fluid machinery and Systems, Gansu Province,Lanzhou 730050 China)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]甘肃省流体机械及系统重点实验室,甘肃兰州730050

出　　处：《西华大学学报（自然科学版）》2019年第4期22-27,共6页Journal of Xihua University:Natural Science Edition

基　　金：甘肃省科技攻关项目(KG954-3-11)

摘　　要：以自主研发的YQH-100型三级轴流式油气混输泵为研究对象,基于Mixture模型的两相流理论,改变叶片倾斜角,在含气率(GVF)分别为0、10%、30%、50%和70%情况下,通过计算流体力学的分析方法对油气混输泵内部流动进行数值模拟,研究叶轮内部气相及压力分布情况,并对其外特性曲线进行分析。研究结果显示:在纯水工况下,叶片倾斜对扬程的影响较大,原模型M4的扬程较最差方案M1(叶片倾斜-10°)高8m;方案M3(叶片倾斜-4°)的扬程较原模型低1.4m,效率较原模型高0.14个百分点;在小流量工况下,原模型的效率较高;在不同含气率工况下,方案M3(叶片倾斜-4°)的增压比原模型低14kPa,效率较原模型高0.22个百分点;叶片适当倾斜一定的角度,可有效减小气团在叶片工作面轮毂侧的聚集面积,使混输泵内部气液两相均匀混合,提高混输泵效率;轴流式油气混输泵的最佳叶片倾斜角范围为-4°~0°。本研究可为油气混输泵的设计及水力优化提供参考依据。Self-developed YQH-100-type of triple stage and axial flow oil-gas mixed pump are taken as the research object and the inclined angle of the blade is changed. Based on the Mixture model of two-phase flow theory, we carried out the numerical simulation of internal flow in oil-gas mixed pump under the five conditions that gas void fractions(GVF) were 0、10%、 30%、50%、70%.We researched the distribution of gas and pressure in the impeller, as well as its external characteristics curves. The results show that the blade inclination has a great influence on the head at the pure water conditions. The head of the original model M4 is 8m higher than the worst scheme M1 (the blade tilt -10°).The head of scheme M3 (blade tilt -4°) is 1.4m lower than the original model , and the efficiency is 0.14 percentage points higher than the original model. Under the conditions of small flow rate, the efficiency of the original model is higher.Under different GVF conditions, the pressure increase of scheme M3 (blade tilt -4°) is 14 kPa lower than the original model, and the efficiency is 0.22 percentage points higher than the original model. The inclined angle of the blade can effectively reduce the gathering area of the air masses in the hub side of the blade working faces , make the gas-liquid well-proportioned mixing in the mixed pump , and improve the efficiency of the multiphase pump.The optimum blade tilt range for the oil-gas mixed pump is from -4°to 0°.The results can provide a reference for the design and hydraulic optimization of oil-gas hybrid pump.

关 键 词：油气混输泵 含气率 内部流动 数值模拟 外特性曲线 

分 类 号：TH312[机械工程—机械制造及自动化]