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Design and Optimization on Annular-Flow Nozzle of the Oil-Water Pump

机译：油水泵环形流动喷嘴的设计与优化

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The transport with core-annular flow (CAF) is widely used in heavy oil transportation, which has low cost, less energy consumption, simple operation and other features. This transport requires two single-stage pump, one annular-flow nozzle and more connecting pipe, therefore, it is necessary to design an oil-water pump, which not only achieving the oil-water core annular flow with a single-stage pump, but also saving space for installation. A new annular-flow nozzle is introduced to assure the oil and water input, but there exists not corresponding theoretical guidance about this nozzle that is the key design issues of this oil-water pump. Combined with the TRIZ theory, the virtual modeling software is used to make a three-dimensional model of this annular-flow nozzle creatively. There are three factors are simulated by using the CFD method based on the VOF model, standard k-ε turbulence model and SIMPLE algorithm, among which are the width of annular gap, the shrinking degree of the leaded pipe and water input pressure, so as to obtain the output characteristic of oil phase. The results showed that, the relatively small width of annular gap and shrinking degree could speed up the formation of the core oil phase; Progressively rising water input pressure makes a formation of CAF rapidly; Eventually the optimized model of this annular-flow nozzle is designed, which could achieve the stabilized outflow of core-annular flow. Meanwhile, the analysis would lay the foundation for future design and manufacture of the oil-water pump.
机译：具有核心环状流量（CAF）的运输广泛用于重油运输，成本低，能耗较少，操作简单等特征。该运输需要两个单级泵，一个环形流量喷嘴和更多的连接管，因此，有必要设计油水泵，这不仅可以通过单级泵实现油芯环形流量，而且还节省了安装空间。引入了一种新的环形流量喷嘴以确保油和水输入，但是对于该喷嘴没有相应的理论引导，这是该油泵的关键设计问题。结合TRIZ理论，虚拟建模软件用于创造性地制作该环形流量喷嘴的三维模型。通过使用基于VOF模型的CFD方法，标准K-ε湍流模型和简单算法，有三种因素进行了模拟，其中包括环形间隙的宽度，引线管和水输入压力的收缩程度，所以获得油相的输出特性。结果表明，环形间隙的相对较小的宽度和收缩程度可以加速核心油相的形成;逐步上升的水投入压力迅速形成CAF;最终设计了该环形流动喷嘴的优化模型，其可以实现核心环形流的稳定流出。同时，分析将为未来的油水泵设计和制造奠定基础。

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