径向剖分式输油泵流场模拟及试验

Simulation and experimental study on flow field of radial profile oil pump

由于四级结构的BB2型输油泵理论上具有高效节能的特点,将两级BB2结构形式的输油泵改进为四级结构,为研究其压力特性以及速度分布情况,并验证其改进的有效性和合理性,在计算流体力学方法的基础上,采用CFX软件进行流场模拟,随后运用试验方法验证其实际工况。研究结果表明,首级叶轮和次级叶轮进口到出口处压力分布比较均匀,具有明显的压力梯度,次级叶轮的流场稳定性相对较差;流道内流动均匀良好,速度方向基本与旋转方向一致,次级叶轮内速度值大于第一级叶轮内流体速度,流道内工作面流速低于背面流速,在叶轮出口处由于导叶头部的干扰出现速度反向现象。结合试验数据表明,四级结构的BB2型输油泵的流量、扬程、效率和汽蚀余量均符合国家标准,并达到了更为高效节能的实际效果。

Because of the high efficiency and energy saving characteristics of the four-level BB2 type oil pump,the two-level BB2 type oil pump at home and abroad is optimized into the four-level structure to study its field characteristic flow and verify its effectiveness and rationality.We used computational fluid mechanics to simulate flow field,and found that the pressure distribution of the first and secondary impeller inlet to the outlet was relatively uniform,with obvious pressure gradient,and the flow field stability of the secondary impeller was relatively poor;In addition,we found that the flow in the passage was evenly distributed,and the velocity direction was basically the same as the rotation direction,and the velocity in the secondary impeller was greater than that in the first stage impeller,and the flow velocity was lower than that of the back flow,and the velocity reversal occurs at the outlet of the impeller.According to the experimental data,the flow,head,efficiency and cavitation residue of BB2 type oil pump with four-level structure all conform to the national standards and reach the practical effect of more efficient energy saving.