计及Re数影响的气动—声学性能实验及优化设计

AERODYNAMIC - AEROACOUSTIC EXPERIMENT AND DESIGN OPTIMIZATION OF REYNOLDS NUMBER EFFECT

实验和计算都发现高Ｒｅ数（自模化区）风机的宽频噪声占有大部分频域，而低Ｒｅ数（非 自模化区）下离散噪声占主导地位。优化设计结果表明对低Ｒｅ数的动叶必须进行修正，低Ｒｅ数 弯掠动叶与高Ｒｅ数相比，需要更大的弯角和掠角才能达到气动—声学性能的最佳值。

Experimental and computational results of aerodynamic-aeroacoustic perfor- mance in an axial-flow fan show that the broadband noise exists in most part frequency domain in self-stimulated domain (high Re). The interaction noise appears almost frequency spectrum in low Re condition. The design optimization is analyzed. In order to obtain the optimum value of aerodynamic-aeroacoustic property, a larger skew angle and a larger sweep angle are obtained in a small-scale fan of low Re.