以滤袋褶形结构的高宽比ɑ为优化对象，建立不同褶数下的褶式滤袋结构的三维几何模型，采用多孔介质及标准k??双方程湍流模型对褶数N=8, 12, 16, 20, 24、袋长L=2.5, 3.0, 3.5 m的褶式滤袋进行气相流场的数值模拟。结果表明，相同进口风速下，褶数N=12 (ɑ=1.12)的褶式滤袋的过滤阻力最小，过滤阻力随进口风速的增长率明显小于其它4种褶数，袋室内的流场分布更均匀，对不同处理风量的工况适应性较好。不同袋长的褶式滤袋除尘器的过滤阻力均随进口风速增加呈二次曲线式增长，处理风量较小时，褶式滤袋越长系统压损越小，但褶式滤袋过短或过长时因系统压损较大均不适宜在高风量下运行，其中L=3.0 m的滤袋其垂直方向的压差梯度较小，袋室内的压力及速度分布更均匀，有利于保护滤袋，降低运行能耗。

In order to achieve optimization of the structure of pleated filter bag, the three-dimensional geometric models of pleated filter bag were correspondingly established under different pleat numbers based on ɑ, which was the ratio of pleat height to pleat width. Then the gas flow field characteristics of pleated filter bags were simulated with porous medium and standard k?? model under some circumstances that when the pleat number N=8, 12, 16, 20, 24 and bag length L=2.5, 3.0, 3.5 m. The results showed that under the same inlet velocity, the filtration resistance of pleated filter bag with the number of pleats N=12 (ɑ=1.12) was smallest, and the growth rate of the filtration resistance was significantly no larger than the other four number of pleats, the distribution of the flow field inside the bag house was more uniform, so the pleated filter bag with N=12 was better adaptable to different treatment air volumes. The filtration resistance of pleated baghouse precipitator with different bag lengths increased with the increase of inlet velocity in the form of a quadratic curve. When the air volume was small, the longer the pleated filter bag was, the smaller the pressure drop of system was, but the pleated filter bag was too short or too long to fit the operation condition of high air volume due to the large pressure drop of the system. The pressure gradient in vertical of the filter bag with L=3.0 m was relative less, both the pressure and velocity distribution in the bag house were relatively more homogeneous, which was beneficial to protect the filter bag and energy-saving.