螺旋分离器水流动特性的CFD模拟与PIV试验

设计了一种新的螺旋分离器，采用CFD数值模拟技术对螺旋分离器的入口管段、螺旋分离段及出口管段内流体流动速度场及压力损失分布特性进行了分析，结合PIV流场测试试验对分离器的入口管段和出口管段内流体流动速度场进行了测量和对比分析。介绍了螺旋分离器油水分离的工作原理、结构参数及PIV实验流程。结果表明：该螺旋分离器螺旋导流效果明显，在螺旋分离段及出口管段内具有持续时间长、离心分离强的螺旋流分离流场；流体流过螺旋分离段后，在出口管段内可形成稳定的螺旋流场；通过对比分离器内入口管段及出口管段PIV试验速度测量值与数值模拟值，结果吻合良好，验证了模拟结果的可靠性；通过分离器的压力损耗分析，指出了螺旋分离器的主要压力损耗位置，设计工况下的分离器最大压力损耗不超过90 kPa。

CFD simulation and PIV test of water flow characteristics in helix separator

Aiming at a newly designed helix separator, the CFD numerical simulation technique was used to analyze the fluid flow velocity field and pressure loss distribution characteristics in the inlet pipe section, helical separation section and outlet pipe section of helix separator. In combination with PIV field test, the measurement and comparative analysis were performed on the fluid flow velocity field in the inlet and outlet pipe sections of separator. This paper also introduced the oil-water separation operating principle, structure parameter and PIV experimental procedure of helix separator. The results show that the newly designed helix separator has an obvious effect on helix diversion; it possesses the helical-flow separation flow field with long duration and strong centrifugal separation in the helical separation section and outlet pipe section. After the fluids flow through the helical separation section, a stable helical flow field can be formed in the outlet pipe section. Through the comparison of PIV test velocity measurement value and numerical simulation value between the inlet and outlet pipe sections of separator, it was found that they had a good consistence, thus verifying the reliability of simulation results. By analyzing the pressure loss of separator, the main pressure loss position of helix separator was determined. The results show that under the design working condition, the maximum pressure loss of separator is unable to exceed 90 kPa.