叶栅稠密度对多相泵效率影响的研究

发布时间：2019-07-01 14:47

【摘要】：多相混输技术是近年来发展起来的一种高效经济的油田开发方式。多相混输泵作为多相混输技术的核心设备,是一种集常规液相泵和气体压缩机性能于一体的多相输送装置。叶轮作为混输泵的核心部件,直接影响着泵中流体的流动稳定性以及泵的效率。而叶栅稠密度作为叶轮的重要几何参数,直接影响着泵的效率。因此,对叶轮叶栅稠密度的研究有着特殊的意义。本课题采用叶轮单通道数值模拟方法,对叶轮进行流场模拟,分析叶轮叶栅稠密度对多相泵效率的影响,寻求某一叶栅稠密度使泵的效率和气液混输性能最优。本课题研究采用比较适合油气混输泵内部流动要求的791翼型,使用UG NX软件对单通道叶轮进行参数化三维造型,运用Gambit软件对模型进行网格划分,在Fluent6.3软件中进行流场数值模拟。单通道叶轮模拟结果表明:多相混输泵的叶轮叶栅稠密度在减小时,叶片表面间压力差增加容易造成气液在流道中的分离,降低泵的气液混输能力,适当增加叶栅稠密度可以保证压力沿翼型平稳增加,可减缓气液两相沿流动方向的相态分离。在高含气率工况下五种叶栅稠密度的叶轮模型相比,轮毂和轮缘处采用相同的叶栅稠密度为2.4时综合性能最优,此模型气液两相分布虽不太均匀,但增压最大,效率最高,轴功率也比较适中,适用含气率范围也最大,其整体性能要远远好于其他几个叶栅稠密度的模型。通过模拟分析绘制了单通道叶轮不同叶栅稠密度下的外特性曲线以及最优模型的特性曲线,为课题组对整机的设计与研究提供了有益的参考资料,其研究工作在一定程度上缩减了螺旋轴流式油气混输泵的研制周期。
[Abstract]:Multiphase mixed transportation technology is an efficient and economical oil field development method developed in recent years. As the core equipment of multiphase mixed transportation technology, multiphase hybrid pump is a kind of multiphase conveying device which integrates the performance of conventional liquid pump and gas compressor. Impeller, as the core component of mixed pump, directly affects the flow stability and pump efficiency of the pump. As an important geometric parameter of impeller, cascade density directly affects the efficiency of pump. Therefore, it is of special significance to study the density of impeller cascades. In this paper, the impeller single channel numerical simulation method is used to simulate the flow field of the impeller, and the influence of the density of the impeller cascade on the efficiency of the multiphase pump is analyzed, and the optimal efficiency and gas-liquid mixing performance of the pump are sought by the density of a certain cascade. In this paper, 791 airfoil, which is more suitable for the internal flow requirements of oil and gas mixed transportation pump, is used to parametric 3D modeling of single channel impeller with UG NX software, Gambit software is used to mesh the model, and numerical simulation of flow field is carried out in Fluent6.3 software. The simulation results of single channel impeller show that when the density of impeller cascade of multiphase mixed pump decreases, the increase of pressure difference between blades can easily lead to the separation of gas and liquid in the flow channel, reduce the gas-liquid mixing capacity of the pump, properly increase the density of cascade can ensure the steady increase of pressure along the airfoil, and slow down the phase state separation of gas-liquid two phases along the flow direction. Compared with the impeller model with the same cascade density of 2.4, the comprehensive performance of the impeller model with the same cascade density of 2.4 is the best under the condition of high gas content. Although the gas-liquid two-phase distribution of the model is not uniform, the gas-liquid two-phase distribution of the model is the largest, the efficiency is the highest, the shaft power is moderate, and the range of suitable gas content is the largest, and its overall performance is much better than that of other cascades. Through simulation and analysis, the external characteristic curve and the characteristic curve of the optimal model under different density of single channel impeller are drawn, which provides useful reference materials for the design and research of the whole machine, and reduces the development cycle of spiral axial flow oil and gas mixed transportation pump to a certain extent.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH38

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