The research on particle trajectory of solid-liquid two-phase flow and erosion predicting in screw centrifugal pump

[摘要] Use the Discrete Phase Model (DPM) based on Euler-Lagrange method, the internal flow field of screw centrifugal pump was simulated by computational fluid dynamics(CFD) code when transmission medium is solid-liquid two phase flow with large-size particles. The research of liquid phase is under the Euler coordinate system while the solid phase is under the Lagrange coordinate system. The energy change, trajectory characteristic of solid phase particle and its erosion damage rule of solid-phase particle in whole computational domain is analyzed with different density, partical size(d=0.05mm, d=0.2mm, d=2mm) and solid volume fraction(Cv=3%, Cv=5%, Cv=7%).The result shows that within a given diameter range, the low density fine particles trajectory are longer, more collision times with flow passage components, more energy loss and the erosion parts are relatively uniform, but particles which are large-size diameter and high density has a big collision angle with the surface of impeller and volute, even the area of impact and abrasion are quite focus, and easy to be transported. particles will impact with the head of impeller when it enter into impeller domain, the erosion mainly occurs on the work side of impeller.

[发布机构] School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China Key Laboratory of Fluid machinery and Systems, Gansu Province, Lanzhou 730050, China^1

[效力级别] 工业技术 [学科分类] 工业工程学

[关键词] Computational domains;Computational Fluid Dynamics codes;Euler-Lagrange method;Particle trajectories;Screw centrifugal pumps;Solid phase particles;Solid volume fraction;Solid-liquid two phase flows