运用正反问题迭代法进行叶片式气液混输泵叶轮的水力设计

基于正反问题迭代,提出了叶片式气液混输泵叶轮水力设计的方法。叶轮叶片的初始几何形状根据给定的速度矩分布规律进行设计,通过叶轮内CFD三维流场分析结果,改进流道参数和速度矩分布规律以优化叶片几何参数和流场分布。外特性试验结果表明,设计叶轮可在较宽的流量范围及含气量范围下工作,最优工况效率可达44．0％,且能在短时间内输送100％的气体而不发生气堵现象,证明了该设计方法的有效性和可靠性。

HYDRAULIC DESIGN OF A MULTIPHASE ROTODYNAMIC PUMP IMPELLER AND TEST VERIFICATION

Concerned with the hydraulic design of a high specific speed rotodynamic pump impeller for gas-liquid two-phase flow transportation, a combined approach of inverse method and CFD analysis is presented. The two-phase mixture is treated as a pseudo single-phase homogeneous fluid under the design condition, and the geometry of impeller blades is designed for a specified velocity torque distribution on S1 stream surfaces through iterative computations of S1 and S2m stream surfaces. To obtain a favorable pressure distribution and optimize the flow field, the design specifications and parameters are improved based on the 3-D turbulent flow analysis of the pump impeller using the SIMPLEC algorithm. Experimental results demonstrate that the designed pump has an optimum hydraulic efficiency of 44.0% and it can work in a wide range of flow rate and gas volume fraction without the gas blocking phenomenon. The validity and reliability of the present approach is proved.