旋转通道条件下示踪粒子粒径控制的研究

Study on Particle Size Control of Tracer Particles under Rotating Channel Conditions

本文论述了使用PIV测量技术时示踪粒子的选取原则,并依托旋转通道实验台,以Laskin喷嘴为基础设计制造示踪粒子发生系统,将粒子与实验气流掺混通入旋转通道,利用激光粒度仪对示踪粒子粒径分布进行测量分析。通过实验数据表明该实验条件下对PIV图像产生主要影响的示踪粒子粒径范围在0.5~1μm,喷嘴前压强与示踪粒子浓度呈正比例关系,实验掺混气流雷诺数与示踪粒子数目成反比,喷嘴孔径在不同条件下对示踪粒子浓度影响不同。

This paper discussed the selection principle of tracer particles when using PIV measurement technology.We designed and manufactured tracer particle generation system based on the rotating channel test bench and Laskin nozzle.After mixing particles and experimental airflow into the rotating channel,we measured and analyzed the particle size distribution of tracer particles with laser particle analyzer.According to the experimental data,the particle size range of the tracer particle that has the main influence on the PIV image under this experimental condition is 0.5~1μm.The pressure in front of the nozzle is directly proportional to the concentration of the tracer particle.The Reynolds number of the mixed flow in the experiment is inversely proportional to the concentration of the tracer particle.The influence of nozzle aperture on the concentration of the tracer particle is different under different conditions.