长输管道输油鲁尔泵内部流场特性研究

为了探究输油鲁尔泵的叶轮—导流器动静干涉特征，保证其稳定运行，采用基于SST 湍流模型对鲁尔泵内部非定常流场进行数值分析，在不同流量工况下探讨了鲁尔泵内的压力分布规律和各过流部件的内部流场特性。研究结果表明：流体静压呈现从叶轮中心随叶片方向不断增大的趋势，在叶轮出口达到最大值。导流器中静压分布较为均匀，在叶片根部存在低压区，对此处的焊接结构造成了不利影响。需对导流器结构优化从而延长部件寿命。流体绝对速度从叶轮中心随流道不断提升，在叶轮出口达到最大值。在低流量工况时，叶轮中速度梯度过大，并且导流器中出现了大量湍流区域，造成了十分严重的冲击损失与水力损失，在实际工作中，工作流量的设置不应过度偏移额定流量。

Research on Flow Field Characteristics of Ruhrpumpen in Long-distance Oil Pipeline

In order to explore the dynamic and static interference characteristics of impeller-deflector of Ruhrpumpen for oil transmission and ensure its stable operation, the unsteady flow field in Ruhrpumpen is numerically analyzed based on the SST turbulence model. The pressure distribution law in Ruhrpumpen and the flow field characteristics of flow components are discussed under different flow conditions. The results show that hydrostatic pressure increases continuously from the center of impeller to the direction of blade and reaches the maximum at the outlet of impeller. The static pressure distribution in the deflector is uniform and there is a low pressure zone at the blade root, which has a negative effect on the welding structure. The structure of the deflector needs to be optimized to extend component life. The absolute velocity of the fluid is continuously increased from the center of the impeller to the maximum at the outlet of the impeller. Under low flow conditions, the speed gradient in the impeller is too large, and a large number of turbulent areas appear in the deflector, which results in very serious impact losses and hydraulic losses. In practical work, the setting of work flow should not deviate excessively from the rated flow rate.