• CN:11-2187/TH
  • ISSN:0577-6686

›› 2009, Vol. 45 ›› Issue (5): 256-263.

• 论文 • 上一篇    下一篇

基于样条函数的弯叶片生成技术及其在微型风扇中的应用

王企鲲; 陈康民   

  1. 上海理工大学动力工程学院
  • 发布日期:2009-05-15

Bowed Blade Generation Technique Based on Spline Function and Its Application to Micro Axial Fans

WANG Qikun;CHEN Kangmin   

  1. College of Power Engineering, University of Shanghai for Science and Technology
  • Published:2009-05-15

摘要: 引入弯度与端壁弯角两个参数,提出一种基于样条函数思想的弯叶片生成方法,并导出弯叶片积迭线的解析表达式。这种弯叶片生成方法能按所选取不同的边界条件与弯度分别形成W型、中心拐点型、C型、自然样条型等多种形式的弯叶片。将这种弯叶片设计方法运用于微型轴流风扇叶片设计,并通过计算流体动力学技术对上述各种弯叶片的气动特性进行数值研究。研究结果表明:W型弯叶片在各工况点均易恶化流动,不利于叶片气动性能的提高;C型弯叶片,特别是作为其特殊形式的自然样条型弯叶片尽管能有效抑制小流量工况流动分离,对扩大稳定工况范围能起到明显作用,但在大、中流量工况下的气动性能则不如相应的直叶片;中心拐点型弯叶片能在扩大稳定工况范围的基础上,同时保证叶轮在大、中流量工况有较好的气动性能,是一种具有实用价值的叶片弯曲形式。

关键词: 气动特性, 弯叶片, 微型轴流风扇, 样条函数, 局部滑移, 临界载荷, 螺栓, 数值计算, 松动

Abstract: A new type of bowed blade based on spline function is proposed and its analytic expression of the stacking line is simultaneously derived by introducing two parameters, i.e., bowness and bowed angle. By this new bowed blade technique, four types of bowed blade, i.e. W type, middle inflexion type, C type and natural spline type can be generated according to different boundary conditions and bownesses. Its application is attempted to micro axial fans with detail numerical investigations on its aerodynamic performance. Results indicate that the bowed blade of W type may deteriorate the flow inside the impeller and go against the improvement of the impeller performance; bowed blade of C type, especially as its particular form natural spline type may effectively restrain the flow separation in the vicinity of the blade top and enlarge the stable operating range for the impeller under small flow rate conditions but its aerodynamic performance is not as good as the corresponding straight blade under large-medium flow rate conditions; bowed blade of middle inflexion type may not only enlarge the stable operating range under small flow rate conditions but also keep its aerodynamic performance almost as good as the corresponding straight blade under large-medium flow rate conditions. So bowed blade of middle inflexion has great practical value.

Key words: Aerodynamic performance, Bowed blade, Micro axial fan, Spline function, critical load , numerical calculation , Bolt , localized slip, loosening

中图分类号: