关键词: 旋风分离器, 数值模拟, 分离效率, 入口蜗壳, 芯管

Abstract: Taking two cyclone separators XLPB-5.0 and XCX-5.0 as the prototype, numerical simulations on their flow field and separation efficiency were conducted by computational fluid dynamics(CFD). The influence of inlet volute form and central tube structure on separation efficiency was discussed. Results showed that the flow field in the cyclone separator presented anisotropic distribution characteristics. Tangential velocity was the primary factors influencing the separation efficiency, while the existence of the radial velocity would cause the phenomenon of short circuit flow field and make the axial velocity distribution asymmetrical, hence, reduced the separation efficiency. The combined action of axial and radial velocity promotes particles to make spiral movement inside the cyclone separator. The separation efficiency of XLPB-5.0 and XCX-5.0 were 92.55% and 94.96%, respectively. This was consistent with the experimental results. Separation efficiency of XCX-5.0 was higher than that of XLPB-5.0 under different core pipe parameters. Compared with the spiral once-through entry(XLPB-5.0), the influence of spiral inlet volute(XCX-5.0)on upper flow field of cyclone separator are complex. Besides, for the two cyclone separators, the separation efficiency decreases with the increase of core tube diameter, but separation efficiency turns to increase first then decrease with the increase of depth of the core tube.

Key words: cyclone separator, numerical simulation, separation efficiency, inlet volute, central tube