间断叶片惯性除雾器流场与分离效率

Flow and Separation Performances of Discontinuous-Blade Demister

为提升船用惯性除雾器对10μm级雾滴的滤除性能,设计一种新型的间断叶片结构,采用数值模拟方法分析既有和新型除雾器内的气液两相流场。结果表明:除雾器内的速度场和雾滴浓度场具有相似性,曲折流道引起的角涡和分离涡不利于微小雾滴的触壁。间断叶片连通了相邻流道,通过涡流抑制和流场的重新组织,可大幅提高壁面对微小雾滴的拦截效率。对于10μm雾滴,间断叶片的综合性能相比既有结构可提高30%~50%。此外,间断叶片的对流传热性能也有所提高。研究结果对船用惯性除雾器的结构设计和性能优化具有一定的指导意义。

In order to improve the filtering performance of marine inertial demister for Class 10μm droplets,a new type of discontinuous blade structure is designed to analyze the two phase flow field within the existing and proposed demisters.The results show that,the field of flow velocity is quite similar with that of droplets concentration.The corner vortexes and the separation vortexes produced by the zigzag channel prevent the small droplets from being captured by the wall.Once the adjacent channels are connected by the discontinuous blades,separation efficiency of small droplets can be improved remarkably through vortex suppression and flow reorganization.The comprehensive performances of the new type demisters are 30%~50%higher than the existing one for 10μm droplets.Besides,the convective heat transfer capability can be improved using discontinuous blades.The research results have certain guiding significance for the structure design and performance optimization of marine inertial demister.