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| Simulation and test of flow process in air filter |
| LI Jia1, LIU Zhen-tao1, LIU Zhong-min2, TAN Yong-nan1, YU Xiao-li1 |
1. Power Machinery and Vehicular Engineering Institute, Zhejiang University, Hangzhou, 310027, China;
2. Hangzhou Dianzi University Hangzhou, 317200, China |
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Abstract In order to study the influence rule and coupling among material, geometric dimension and pleated number of filter, the mathematic model of internal flow distribution of air filter was established and calculated on the basis of CFD principle as well as related experiment confirmation. It was proved that the model mentioned above was reasonable comparing the experimental data and simulation result. The angle between adjacent filter was considered as a dimensionless parameter of filter element to examine the effect of different element structures on performance parameters such as pressure lose, filtration efficiency and life. The simulation result showed that the flow resistance increased rapidly as the angle decreased less than three degree and declined slightly as the angle increased larger than five degree for radical air filter. And the filtration efficiency went down with the steady reduction of the effective filter area when the angle was less than three degree, whilst the life was shortened with the increase need for the dust capacity when the angle was lager than four degree. It cames to a conclusion that the adjacent angle presented the structure of the filter element should be between three degree to four degree when designing a radical air filter on the base of the test and simulation results.
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Published: 20 March 2012
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空气滤清器流动过程仿真与试验分析
为探明滤纸的材质、尺寸和摺数等各因素对空气滤清器性能的影响规律,以及各因素相互间的耦合作用机制.应用计算流体力学方法对空气滤清器内部流场进行仿真计算,并对仿真模型进行试验验证,试验结果和仿真结果相吻合.采用滤纸夹角作为滤芯结构无量纲参数,评价滤芯结构变化对空气流动、滤清效率及滤清寿命等性能参数的影响.研究结果表明对于星型摺状空气滤清器,流动阻力在滤纸夹角小于3°时增长迅速,滤纸夹角大于5°后无明显变化,滤纸有效过滤面积在滤纸夹角小于3°后急剧减小导致过滤精度降低,滤纸容灰量在滤纸夹角大于4°后迅速增加导致滤清寿命缩短.以仿真与试验结果为基础,提出空气滤芯结构设计参数推荐范围,滤纸夹角应介于3～4°.
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