基于测量系统的 3D PTV (追踪 Velocimetry 的粒子) ,有四条不同直径的粒子的 3D 运动特征被调查。在特定的流动条件下面,粒子的 3D 运动上的粒子直径的影响被学习,并且骚乱特征被不同统计方法分析。当直径增加了,结果证明粗糙的粒子的骚乱紧张减少了。在近的墙区域,纵、垂直的变化速度的概率密度分布两个都从正常分发背离了;当时在外部区域,垂直变化速度的概率密度分发近似同意了正常分发。
Based on the 3D PTV (Particle Tracking Velocimetry) measuring system, the 3D movement characteristics of particles with four different diameters were investigated. Under specific flow conditions, the impact of particle diameters on 3D motion of particles was studied, and the turbulence characteristics were analyzed by different statistical methods. The results showed that the turbulence intensity of coarse particle decreased as the diameter increased. In near wall region, the probability density distributions of longitudinal and vertical fluctuation velocities both deviated from the normal distribution; while in the outer region, the probability density distribution of vertical fluctuation velocity approximately agreed with the normal distribution.