研究通过改进叶片尖端几何形状，实现工业风扇被动噪音控制的有效设计。实验与数值分析验证了新型尖端设计对气动性能的影响，特别是减小了湍流泄漏流对声学特性的影响。尖端涡旋流结构的分析揭示了其在整体声学排放中的作用。研究发现，尖端设计变化显著影响了叶片泄漏流的多涡旋行为，同时对转子效率有积极影响，通过控制泄漏流控制噪音。
摘要：
The application of improved blade tip geometries is studied with the aim of identifying an effective design concept for industrial fan passive noise control. The concept developed optimizes a datum blade by means of profiled endplates at the tip, reducing fan noise by changing the tip leakage flow behaviour. Experimental and computational investigations have been carried out on a family of axial fans, in fully ducted configuration, to establish the aerodynamic merits of the proposed blade tip design concept. The flow mechanisms in the fan tip region are correlated to specific blade design features that promote a reduction of the fan aero-acoustic signature in both tonal and broadband noise components. The tip vortical flow structures are characterized, and their role in creation of overall stage acoustic emissions clarified. The reported research identifies modification of tip geometry as markedly affecting the multiple vortex behaviour of blade tip leakage flow by altering the near-wall fluid flow paths on both blade surfaces. Blade tip endplates were also demonstrated to influence the rotor loss behaviour in the blade tip region. Improvement of rotor efficiency was correlated to the control of tip leakage flows.
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