层流炉反应管内炭粉颗粒运动的PIV试验

摘要

In order to study the movements of char powders in laminar entrained flow reactor, a transparent experimental apparatus was designed for Particle Image Velocimetry(PIV) measurement of flow field.The velocities of char powders whose mesh size was between 100 to 120 were investigated by PIV at the different flow rates of 1.0-2.5 m3/h.The results indicated that the axial velocity of char powers in the pipe center was very small near the outlet, subsequently rapidly reached the maximum and then decreased.The axial velocity at the center of pipe reached a maximum in the region within 1.8-123.8 mm.The axial velocity distribution was a parabola-like curve along the radius.The relationship between Re and the dimensionless residential time of char powders was obtained finally.%为了研究炭粉颗粒在层流炉反应管内的运动规律,按照1:1比例设计制造了一套透明玻璃试验装置用于PIV流场测量.分别在4种不同的主气流量下,对粒径为100～120目的炭粉颗粒在反应管内的速度场进行了PIV无接触测量.结果表明,在反应管中心处,开始时,炭粉颗粒的轴向速度在下料口附近很小,然后迅速增加到最大值,而后以此速度运动一段距离后,速度开始减小.在约1.8～123.8 mm段,炭粉颗粒的轴向速度在管道中心处为最大.轴向速度沿径向成类似抛物线状分布;通过对测量数据的分析计算,获得了管内气流雷诺数与炭粉颗粒停留时间(无量纲处理后)的关联式.