一种微型轴流风扇扭叶片设计方法及其气动特性的数值研究

A New Design Approach for Twisted Blades of Micro Axial Fans and Numerical Investigation on Its Aerodynamic Performance

本文利用"径向平衡"原理,建立了轴流叶轮出口通流速度沿叶高的分布方程,并基于此提出了一种新的扭叶片设计方法。将该方法运用于某微型风扇的设计,并采用CFD技术,数值研究了不同扭曲形式下该型风扇的气动特点。通过与用传统方法设计的扭叶片及原始直叶片的气动性能的对比发现,按本文提出的方法所设计的扭叶片不仅能扩大微型风扇小流量稳定工况范围,而且其风压明显增加,有助于提高微型风扇的气动性能。

By the principle of ＇ Radial Equilibrium＇, an equation was derived to describe the radial distribution of throughflow velocity, by which a design approach was newly proposed for twisted blades of micro axial fans. This approach was tentatively applied to the design for a micro axial fan of certain kind and the aerodynamic performance was numerically investigated for different shapes of twisted blades. Compared to the corresponding straight blade and the twisted blade designed by the traditional approach, this new twisted blade not only enlarge the stable operating range but also improve the flow pressure, which contributes to the improvement of the blade＇s aerodynamic performance.