3D numerical simulation was carried out to a two-stage variable vane axial flow fan using Fluent software,so as to study the effects of the first-stage guide vane structure on aerodynamic performance of the fan,such as long-short composite guide vane or single long guide vane,etc.,and to compare the fan performance when the short vane is placed at different axial and circumferential positions and has different lengths.Results show that both the single-stage diffusion performance and the overall aerodynamic performance of the long-short composite guide vane are superior to those of the single long guide vane.When the short vane is located at inlet of the first-stage guide vane in the intermediate pitch between two adjacent long vanes,both the full pressure and efficiency of fan shall reach the optimum,especially the efficiency will be significantly higher than at other places.In addition,the length of short guide vane also has significant effects on the fan performance.Increasing or decreasing the length of short guide vane will cause deterioration of the fan performance and result in notable irreversible loss,when the length of the short guide vane is 320 mm.
two-stage variable vaneaxial flow fanlong-short composite guide vaneentropy production rate
NETL
NSTL
万方数据
维普
