耐辐照型纤维过滤器过滤性能的数值模拟

Numerical simulation of the filtration performance of radiation-resistant fiber filters

针对褶型金属纤维过滤器的过滤性能开展数值模拟研究,本文采用多孔介质模型,模拟金属纤维滤料内部复杂的堆积结构。根据纤维滤料的结构参数编写流动阻力和过滤效率计算程序,将该程序与FLUENT软件结合构成了金属纤维滤料过滤性能的数值模拟方法,并用实验数据验证了所建立模拟方法的准确性。利用此方法进一步研究了在不同进口流速下,大褶宽比矩形褶过滤器的过滤性能。结果表明:亚微米颗粒在低流速下通过高效过滤器,布朗扩散和拦截占主导作用,惯性碰撞可忽略不计;流量沿褶通道分配均匀,沿程阻力及局部阻力可忽略不计,总阻力等于介质阻力;相同褶宽条件下,随着进口流速的增加,最易穿透粒径逐渐减小。

In this study,numerical simulation research was conducted on the filtration performance of pleated metal fiber filters.The porous media model was used to simulate the complex stacking structure inside the metal fiber fil-ter materials.The calculation program of flow resistance and filtration efficiency was compiled according to the structural parameters of fiber filter materials,and the numerical simulation of the filtration performance of metal fi-ber filter materials was formed by combining this program with the software FLUENT.The accuracy of the estab-lished simulation method was verified with experimental data.Using this method,the filtration performance of rec-tangular pleated filters with large pleat ratios was further studied under different inlet flow rates.The results indica-ted that submicron particles could pass through the high-efficiency filters at low flow rates,with Brownian diffusion and interception playing a dominant role and inertial collisions being negligible.The flow was evenly distributed along the pleated channel,on-way resistance and the local resistance can be ignored,and the total resistance was equal to the media resistance.With the same pleat width,the most penetrated particle size gradually decreased as the inlet flow rate increased.