翼型选择对油气混输泵性能的影响

Aerofoil design and gas-oil mixed pump performance

在混输泵的设计中,翼型的选择非常重要,它直接影响叶轮的优化设计。为了准确地估计翼型的水力特性,选择了5种翼型用于油气混输泵叶轮的优化设计。叶片造型方法为:首先获取叶片各截面叶素数据,其次计算弦长和包角等主要参数,然后基于点的坐标几何变换求出各截面在空间实际位置的三维坐标,最后基于3D建模完成叶片计算机3D绘图。采用Mixture模型来处理油气混输泵中气液两相流问题,对5种不同翼型泵内部流场的数值计算结果认为,对选择相对厚度相同的同一种翼型,翼型最大厚度在弦长中部,即在50%弦长位置时,油气混输泵的输送性能最佳,791翼型比较符合油气混输泵内部流动要求;油气混输泵内部流动状态很复杂,它不仅与叶轮翼型有关,还与含气体积分数有关。

The proper choice of aerofoil is of great importance in the design optimization of gas-oil mixed pump. In the study, five different aerofoils were chosen for the determination of hydraulic features. Blade was modeled with cross-section data and main parameters such as chord length and wrap angle. Three dimensional coordinates of each cross section in space were obtained from point-based coordinate geometry. 3D blade was completed. The problem of gas-liquid two-phase flow was solved with Mixture model. The study results show that, with the same type of aerofoil of the same relative thickness, the pump conveying ability achieves optimum with the maximal relative thickness position changed to the middle of the chord, that is, 50% relative thickness.