盐析两相流场中PDPA测量方法

研究了在盐析液固两相流动中,盐析晶体颗粒流体动力学特性及其与流体非平衡性试验.在分析盐析两相流特点,总结两相流场测试方法的基础上,认为相位多普勒粒子分析仪(PDPA)是最合适、有效的盐析两相流测量仪器.结合管流及叶轮机械中的应用实例探索PDPA在盐析两相流测量中的方法,提出测量中需解决的关键问题:非球形颗粒测量、液固两相运动区分、测量窗口、旋转叶轮测量的周向定位、两相三维速度测量等,并给出了解决措施.给出部分测量结果,并进行了测量误差分析.为盐析流动机理的研究提供了一种有效、准确的试验手段.

PDPA measurement method on salt-out two-phase flow

Hydrodynamic features of salt-out crystal particles are studied in salt-out liquid-solid two-phase flow and the non-equilibrium between liquid and solid phase.According to the salt-out flow characteristics it is found that Phase Doppler Particle Anemometer(PDPA) is the most effective instrument used for the flow measurements among current flow measurement methods.Flow in pipeline and turbomachine are tested by PDPA as examples.Measurement methods are introduced,including nonspherical particle measurement,window effections,discrimination between two phases,circumferential orientation in rotated impeller,and 3D velocity measurement.Error analysis is also taken.It provides an effective measurement means to reveal the mechanism in salt-out flow.