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| Unsteady flow simulation and performance prediction of a metal single screw pump based on CFD |
| HUANG Si, KANG Wenming, QIU Guangqi, WANG Xueqian |
| 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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Received: 08 February 2017
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