Abstract:For the sake of high efficiency and low resistance of processing oily sewage, two guide vane structures of axial-flow liquid-liquid cyclones are designed by using different methods. The software of Fluent is used to simulation the flow field inside the axial-flow liquid-liquid cyclones, to focus on the analysis of the velocity distribution, the pressure drop and the shear stress distribution. The results show the cyclone with aerodynamic method designed guide vane had following characteristics, comparing to the cyclone with geometrical method designed guide vane: the peak of tangential velocity and axial upstream velocity are both larger, and the guide vane can control the fluid well and no fluid separation appearing on the surface of the guide vane; the radial pressure gradient of the static pressure is larger, and total pressure drop is lower, that is the energy consumption is low; the turbulence intensity is lower, but the peak of shear stress is slightly larger. So the aerodynamic method designed guide vane can accelerate and control the fluid well, so the centrifugal force is larger, meanwhile the anisotropism of turbulent flow is weaker which can reduce the possibility of the droplet breakage and improve the efficiency of separation. Above all, the aerodynamic method designed guide vane has a very good prospect.