Analysis of Tip Clearance Vortices in a Rotating Axial Fan by Large-Eddy Simulation

摘要

In this paper the flow in a low-speed axial fan at a Reynolds number of 9.36×105 based on the outer casing diameter is investigated by large-eddy simulation(LES)using a cut-cell method based Cartesian flow solver for compressible and viscous flows.The computation includes one of five blades using a periodic boundary condition in azimuthal direction.The paper focuses on the capability of the Cartesian flow solver to efficiently and accurately predict the flow field in axial fans.Simulations with two diffierent grid resolutions and volume flow rates have been performed.Instantaneous and mean flow field results for the fan focusing on the phenomena near the tip-gap region including the tip-gap vortex will be discussed.