摘要本文运用ANSYS Workbench软件对上悬式离心机进料管中的悬浮液进行流场模拟,分析出原进料管设计方面的缺陷。结果发现悬浮液在原进料管中的流动会出现涡流和二次环流等能量耗损的情况,并且悬浮液中的固体颗粒在转鼓壁面处过于集中,即使在离心力场的作用下也会使最终的滤饼厚度不均,影响离心机的生产能力和产生振动等安全隐患。因此本文针对原型号进料管的缺陷在不改变原空间位置和整体尺寸的技术上,进行新的结构设计,并且运用FLUENT流体分析软件进行流场模拟,通过CFD软件进行分析对比,结果发现,所设计的三种新型进料管的能量耗损要明显小于原型号进料管,最重要的是悬浮液中的固体颗粒在转鼓内壁处分布较广,使得最终滤饼厚度相对均匀,这样一方面保护了离心机的生产安全,另一方面提高了离心机的生产能力。但是对这三种设计方案在进行选择时会因为经济上的差异出现优劣之分,因此在进行甄选时,要根据实际生产状况和生产预算来进行选择。84918
毕业论文关键词:离心机;进料管;流体分析软件;悬浮液;流场
Abstract In this paper, the Workbench ANSYS software is used to simulate the flow field of the suspended fluid in the feed pipe of the upper suspension type centrifuge, and to analyze the defects in the design of the original feed pipe。 The suspension will appear two times circulation vortex and energy loss in the original feed pipe flow situation, and solid particles in the drum wall is too concentrated。 Even under the action of centrifugal force field, the final filter cake thickness is uneven, which will affect the production capacity of the centrifuge and produce vibration and so on。 So, in this paper, a new structure design is carried out to fix the defect of the old feed pipe, which does not change the original space position and the overall size。 FLUENT fluid analysis software is used to simulate the flow field, and the CFD software is used for analysis and comparison。The results show that three kinds of new feed pipe energy dissipation is significantly less than the prototype feed pipe。 The most important is the solid particles in suspension are widely distributed on the inner wall of the drum, the cake thickness is relatively uniform, on the one hand, protecting the safety of the centrifuge, on the other hand, improving the production capacity of centrifuge。 But the three design options in the selection will be the pros and cons of the points, so in the selection, according to the actual production situation and production budget to choose。
Keywords: centrifuge; feed pipe; fluid analysis software; suspension; flow field
目录
第一章 绪论 1
1。1课题研究的目的与意义 1
1。3本文研究的目的和内容 3
第二章 离心机进料管的流体力学分析 5
2。1工程流体力学简介 5
2。1。1流体的压缩性和膨胀性 5
2。1。2 流体的粘性 6
2。1。3拉格朗日法和欧拉法 7
2。2流体的运动微分方程 9
2。2。1连续性方程 9
2。2。2能量方程 9
2。2。3动量方程 10
2。3进料管内流动的能量损失 10
2。3。1沿程损失