基于CFD的潜液式液化天然气泵导叶设计

发布时间：2018-07-06 14:35

本文选题：潜液式液化天然气泵 + 导叶　；参考：《上海大学学报(自然科学版)》2016年05期

【摘要】：潜液式液化天然气(liquefied natural gas,LNG)泵工作时,屏蔽电机和泵体全部浸没在低温液体中.为减小泵的径向和轴向尺寸,潜液式LNG泵采用了一种特殊结构的导叶.在分析潜液式LNG泵导叶结构特点的基础上,研究导叶进口喉部宽度和折转角对泵设计工况水力性能的影响.首先,设计不同几何参数的导叶,并分别与同一叶轮进行匹配;再通过ANSYS CFX软件,采用标准k-ε湍流模型对各导叶分别进行全流场数值计算.计算结果表明:进口喉部宽度是潜液式LNG泵导叶的关键尺寸,设计时需重点考虑;进口喉部宽度存在最优值,且最优值大于经验值;进口折转角对泵扬程和效率影响较小.因此,设计导叶时可优先确定其他关键尺寸,再通过调节进口折转角改善导叶的结构.
[Abstract]:When the submerged liquefied natural gas (liquefied natural) pump is working, the shielding motor and pump body are all immersed in low temperature liquid. In order to reduce the radial and axial dimensions of the pump, a special type of guide vane is used in the submersible LNG pump. Based on the analysis of the structural characteristics of the guide vane of the submersible LNG pump, the effects of the inlet throat width and the angle of rotation of the guide vane on the hydraulic performance of the pump under design conditions are studied. First, the guide vane with different geometric parameters is designed and matched with the same impeller, and then the full-flow field of the guide vane is numerically calculated by using the standard k- 蔚 turbulence model by ANSYS CFX software. The calculation results show that the inlet throat width is the key dimension of the guide vane of the submerged LNG pump, which should be taken into account in the design; the inlet throat width has an optimum value, and the optimum value is greater than the empirical value; and the inlet angle of rotation has little effect on the pump head and efficiency. Therefore, other key dimensions can be determined first when designing guide vane, and then the structure of guide vane can be improved by adjusting the inlet turning angle.
【作者单位】：上海大学上海市应用数学和力学研究所;
【分类号】：TH38

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