Resumen de Axial flow fan performance improvement via leading-edge reshaping
Shuiqing Zhou, Zheyu Li, Yuebing Li, Weiya Jin, Mingjue Zhou
Performance improvement in axial flow fans is a popular research topic that is typically explored by changing the blade shape and tip clearance of the leading edge or trailing edge. In this study, the Bézier curve method was used to reshape the impeller of a typical axial flow fan in effort to improve the vortex structure and minimize noise. Numerical simulations were run to analyze the differences in performance between the original and modified impeller. The performance of impeller B, which was designed with a convexity-preserving structure at the trailing edge, markedly improved with small secondary loss. As expected, the Bézier curve method as-applied to impeller B facilitated a type-line parametric design in the meridional plane. A noise test was also conducted in a semi-anechoic chamber with 1/3 octave sound pressure in the far field. The noise-reduction effect with convexity-preserving structure at trailing edge was determined by comparing the sound pressure levels at various frequency bands.
