提高气固分离与排气一体机能头的数值模拟研究

发布时间：2018-03-31 07:38

本文选题：气固分离　切入点：离心叶轮　出处：《华中科技大学》2015年硕士论文

【摘要】：气固分离与排气一体机(以下简称一体机),创新性地将离心风机置于传统旋风分离器内部,对超细颗粒具有较强的分离能力,然而前人研究表明,一体机分离筒体部分压力损失太大,离心风机提供的能头不足以满足气体在一体机中运输,所以需要对装置进行改进,提升装置能头,改善一体机内部流场。本文即从增加一体机能头的角度进行探索性研究,通过改变一体机的单一做功部件(离心风机),在一体机中加入不同类型的叶轮机械,通过数值模拟研究不同做功部件对一体机能头的影响,并对比不同模型的内部流场情况和分离性能,为提高一体机的能头和分离效率做贡献。主要内容和结论如下:(1)选择轴流风机和离心扭曲叶轮作为提高一体机能头的方向。用CF-turbo对离心扭曲叶轮建模,采用MATLAB和SolidWorks对轴流风机进行建模。选择适合一体机的做功元件并确定对比模型:原始模型(A)与加入离心扭曲叶轮后的模型(B);原始模型(A)与加轴流风机后的模型(C);加轴流风机后的模型(C)和同时加入轴流和扭曲叶轮的模型(D)。(2)通过模拟发现,轴流风机能有效改善一体机流场,但是并没有增加离心叶轮的能头,表示轴流风机和离心风机匹配并不成功,后期还应继续探索。(3)离心扭曲叶轮能够很好的提高一体机的能头,模拟算例中离心叶轮全压提高了18.7%,但是分离筒压力损失也相应增加了,提高一体机能头的同时应该同时考虑减小压力损失。(4)采用随机轨道模型(DPM)对模型机内颗粒相进行模拟,结果显示一体机对超细颗粒具有较强的分离能力。
[Abstract]:The gas-solid separation and exhaust integrated machine (hereinafter referred to as "integrated machine") innovatively placed the centrifugal fan inside the traditional cyclone separator, which has a strong ability to separate ultrafine particles. However, previous studies have shown that, The pressure loss of the separation cylinder part of the integrated machine is too large, the energy head provided by the centrifugal fan is not enough to satisfy the gas transportation in the integrated machine, so it is necessary to improve the device and raise the energy head of the device. Improving the internal flow field of an integrated machine. In this paper, an exploratory study is carried out from the angle of increasing the energy head of an integrated machine, and by changing the single work component of the integrated machine (centrifugal fan or fan, different types of impeller machinery are added to the integrated machine, Through numerical simulation, the influence of different work components on the energy head of an integrated machine is studied, and the internal flow field and separation performance of different models are compared. In order to improve the energy head and separation efficiency of an integrated machine, the main contents and conclusions are as follows: 1) the axial flow fan and centrifugal twisted impeller are selected as the direction to improve the energy head of the integrated machine. The centrifugal twisted impeller is modeled by CF-turbo. MATLAB and SolidWorks are used to model the axial flow fan. The work elements suitable for the integrated machine are selected and the comparative models are determined: the original model (A) and the model after the centrifugal twisted impeller is added, the original model (A) and the model after adding the axial flow fan (A) and the model after the addition of the axial flow fan are selected. The model after adding axial flow fan (C) and the model with axial flow and twisted impeller are found by simulation. The axial flow fan can effectively improve the flow field of the integrated engine, but it does not increase the energy head of the centrifugal impeller, indicating that the matching between the axial flow fan and the centrifugal fan is not successful, and should continue to explore at the later stage) that the centrifugal twisted impeller can improve the energy head of the integrated machine very well. In the simulation example, the full pressure of centrifugal impeller is increased by 18.7%, but the pressure loss of the separation cylinder is also increased accordingly. While increasing the energy head of an integrated machine, the pressure loss should be reduced at the same time. (4) the particle phase in the model is simulated by using the random track model (DPM). The results show that the one-body machine has strong separation ability for ultrafine particles.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X701.2

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