Research on the performance improvement of the low pressure axial flow fan

Based on the conventional qusi-3D design system,the CFD/CAD design method and the leading edge skewed-swept technique are studied on the axial flow fan used in the air-conditioner system.The performance of model fan and the new designed fan are measured experimentally and analyzed numerically by solving three-dimensional Reynolds-averaged Navier-Stokes equations with the Spalart-Allmaras turbulent model.The numerical results show good agreement with the experimental data,which indicates the feasibility of the design method and the validity of the numerical simulation.The results have disclosed that the secondary vortices flow region in the blade passage could be diminished when large forward skewed-swept angle is applied.The main flow region is enlarged and the separated flow at leading edge is almost eliminated.The fan noise could reduce by 0.5～1.3dB(A) without any negative influence on the aerodynamic performance of the fan.