水滴撞击特性的动态图像测量方法

用石膏脱模的方法制作圆柱实验件.实验采集圆柱试件表面不同位置染色过程的动态视频数据;依据圆柱驻点处色度值时序信号的增长曲线,将实验划分为欠饱和区、平衡区和过饱和区3个阶段;将平衡区RGB色度空间的色度值c与水滴撞击特性的局部水收集系数建立关联.结果表明:平衡区的比色分布符合局部水收集系数相对驻点处β/β_m分布;不同位置c值增长曲线具有相似性,缩比时间尺度1/t_b分布符合数值仿真欧拉法β/β_m分布的定义;实验结果与数值仿真结果对比误差率小于10%.

Dynamic image processing method of droplets impingement characteristics measurement

Test cylinders were made up by gypsum. Dying process videos at different locations on test cylinders were collected. A complete test was divided into three ages: sub-dyed, balanced and over-dyed according to the color increase on stagnation point. The relationship between RGB colourity and the local water droplet collecting parameter was build. Results show that the normalized color distribution agrees well with the opposition between local water droplet collecting parameter and stagnation point water collecting parameter. Color increase characteristic among different locations on cylinder are similarity. The rate of time reduction at different location can be deduced to the definition of β/β_m in Euler-simulation method, error between test and simulation result was less than 10%.