| 基于CFD的全金属单螺杆泵非稳态流场计算及性能预测 |
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| 引用本文： | 黄思,康文明,邱光琦,王学谦.基于CFD的全金属单螺杆泵非稳态流场计算及性能预测[J].排灌机械工程学报,2018,36(12):1211-1215. |
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| 作者姓名： | 黄思 康文明 邱光琦 王学谦 |
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| 作者单位： | 华南理工大学机械与汽车工程学院, 广东 广州 510640 |
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| 摘 要： | 为了得到螺杆泵内非稳态流场特性及间隙泄漏规律,采用CFD的动网格技术,针对油田使用的全金属单螺杆泵进行三维瞬态流场数值模拟,在此基础上预测计算了不同转速、压头和流体黏度条件下螺杆泵的流量、功率及总效率并与试验结果进行了对比.结果显示,螺杆泵在运行中具有显著的非稳态特性,在1个旋转周期内,流量出现的脉动次数与螺杆泵定子转子导程的比值相一致,高压头工况下的泄漏量和流量值的脉动幅度明显大于低压头工况下的情况;在计算高压头螺杆泵输入功率时,机械及容积损失不应忽略.基于CFD的性能预测和实测数据的趋势较为一致,误差在工程允许范围内,表明采用的模拟计算方法是切实可行的.
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| 关 键 词： | 全金属单螺杆泵 非稳态流场 数值模拟 性能预测 |
| 收稿时间： | 2017-02-08 |
Unsteady flow simulation and performance prediction of a metal single screw pump based on CFD |
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| HUANG Si,KANG Wenming,QIU Guangqi,WANG Xueqian.Unsteady flow simulation and performance prediction of a metal single screw pump based on CFD[J].Journal of Drainage and Irrigation Machinery Engineering,2018,36(12):1211-1215. |
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| Authors: | HUANG Si KANG Wenming QIU Guangqi WANG Xueqian |
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| Institution: | School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China |
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| Abstract: | A metal screw pump is a kind of machines by clearance fitting of stator and rotor, with many advantages such as the resistance against wear, high temperature and corrosion. Flow domain inside a screw pump is a complex three-dimensional space varying with time, thus the dynamic mesh technique in CFD was performed in this study to numerically simulate 3D transient flow field of a metal single screw pump used in oil-fields. The unsteady flow characteristics of the pump and leakage data through the gap of the screw pump were acquired accordingly. Furthermore, the flow rate, power and global efficiency of the pump were predicted based on the CFD results under the conditions of different rotational speed, pump head and fluid viscosity. The results show that the screw pump has significant unsteady characteristics during operation. In one rotation period, flow pulsation frequency is consistent with the lead ratio of stator and rotor of the screw pump. Leakage and the pulse amplitude of flow value in higher pressure condition are considerably greater than those in lower head condition. For the calculation of screw pump input power in high pressure head, mechanical and the volumetric loss can not be ignored. The trend of the performance prediction based on CFD in this study is consistent with that of the measured data from the literature, and the error is within the allowable range for engineering, indicating that the proposed simulation method is feasible. |
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| Keywords: | single metal screw pump unsteady flow numerical simulation performance prediction |
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