方形分离器内部两相流场的PDA实验研究注意:本论文已在《中国电机工程学报》2001,21(2):42-45发表 摘 要: 应用三维颗粒动态分析仪(3D-PDA)对方形下排气分离器内的气固两相流场进行了测试,得到了几种工况条件下的流场矢量分布。研究发现分离器方腔内的流场偏离其几何中心,并呈中间为强旋流动和边壁附近为弱旋的准自由涡区的特点,且在边角处存在局部小旋涡。不等温流场比等温流场要均匀一些,但旋流强度减弱,分离效率降低。研究结果对于分析分离器的分离机理和结构优化有一定的指导意义。
An experimental study on the gas-solid two-phase flow in a square cyclone separator with downward gas exit by 3D-PDA SU Yaxin ZHOU Jinsong LUO Zhongyang CEN Kefa Abstract: Three dimensional Particle
Dynamic Analyzer (3D-PDA) was employed to measure the gas-solid two-phase
flow in a lab-scale square cyclone separator with downward gas exit under
4 cases of different inlet velocity and particle concentration. The particle
used in the test was glass beard of mean diameter 30~40mm. It's found
that the center of the flow field deviated from the geometric center of
the cyclone. The flow fields showed a feature of Rankine eddy, i.e. strongly
swirling region in the central part and pseudo-free eddy region of weak
swirling intensity near the cyclone wall. Local vortex existed at the
corners where the flow changed its direction sharply. When the cyclone
wall was heated and the suspension temperature was elevated, it's found
that the flow field became more uniform than that under room-temperature
condition. The local vortex at the corners were weakened and the swirling
intensity became poorer which led to a decreased total mean separation
efficiency from about 81% to 76.5%. The results of this paper provide
a further understand of the separation mechanism and guidance for the
optimization of the square cyclone separator structure. 1、浏览PDF格式全文需要使用软件--Abode Acrobat(由于软件较大并常见,我站不提供下载) 2、下载论文全文请点击鼠标右键“另存为”或使用网络蚂蚁下载(86KB) 本站收录的本文作者的其他论文: |
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