Resistance Characteristic Analysis And Optimal Design Of Cluster Device In Cluster Pipe Network

The cluster pipe network plays more and more important role in the wind powersystem in tobacco industry. However, cluster pipe network designing is severely lackof theory and experiment data. So the resistance characteristic and optimal design areinvestigated in this paper, and the results obtained by experiment and CFD simulationbenefit the application and development of central process wind technology forcigarette industry.The experimental system is built with5branches based on the factory, thepressure loss is measured when shutting down different branch at7levels gas velocity,and the drag coefficients of gathering device are calculated. The results show that,increasing of pneumatic conveying velocity, the pressure drop of cluster deviceincrease while its drag coefficient decreasing. Furthermore, the more branches closing,the curves of pressure loss and drag coefficient of cluster device are much gentle.The cluster device used in the experimental system is modeled to simulate thehead loss and drag coefficient, the results coincide with experimental results. Theflow behavior indicates that the causes of eddy are the goals of optimization design.Orthogonal design is used to optimize the structure of cluster device, and it confirmsthat the order of4factors effect on the cluster device pressure drop is external wallspacing of branches(b), convergent section length(L2), edge length(a) and straightlength(L1). The optimal combination values of the four parameters are gained, andthey are a=60mm, b=20mm, L1=200mm, L2=800mm.The flow field characteristic of gathering device designed with best parameters isvalidated by numerical simulation, the results show that the flow field in the newcluster device is more stable than before, and the pressure loss declines fifty Pascal.