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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。
Drag coefficient is one of the basic parameters to characterize the gas-solid interaction. Conventional drag coefficient measurement mainly adopts the gravity sedimentation method, which is only applied to heavy particles and the surface is smooth and dense, and is not suitable for measuring the drag coefficient of non-spherical and light particles such as biomass. This paper introduces a high-speed camera measurement method of non-spherical and lightweight particles drag coefficient, based on the particle video and image processing methods to analyze the change of particle force and windward cross section in the measurement area.Through this method, Typical spherical and disc-shaped particles drag coefficient, the experimental results show that the spherical particles measured results and the standard drag curve predicted changes in the trend; disc-shaped particles, the measured results and non-spherical particle drag coefficient Hoizer Compared with the empirical formula, there is an average error of 20%.