曳力系数是表征气固相互作用的基础性参数之一.常规的曳力系数测量主要采用重力沉降法,只适用于重颗粒、且表面光滑密实的情况,并不适用于像生物质这类非球形、轻质颗粒的曳力系数的测量.本文介绍一种非球形、轻质颗粒曳力系数的高速摄像测量方法,基于颗粒视频、图像的处理方法,分析在测量区域内颗粒的受力大小和迎风截面的变化.应用该方法测量两种典型球形、圆盘状颗粒的曳力系数,实验结果表明球形颗粒的测量结果与标准曳力曲线预测的结果变化趋势一致;对于圆盘状颗粒,其测量结果与非球形颗粒曳力系数的Hoizer经验公式计算值相比,存在20％的平均误差.
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