Effects of Outer Edge Bending on the Aerodynamic and Noise Characters of Axial Fan for Air Conditioners

Outer edge bending is already used on the axial fan blades of air conditioners, reducing leakage flow loss at blade tip and suppressing vortex development, thereby improving aerodynamic acoustic performance. However, there are few studies multi-parameter design optimization this complicated structure, most only focus overall sound pressure level rather than quality when evaluating noise. This study investigated effects outer structure performance conditioners’ fans by experiments numerical methods. Based orthogonal method, three parameters, circumferential starting angle, radial relative position, degree were analyzed, best efficiency scheme was selected. A comparative analysis preferred original schemes shows that towards suction surface successfully inhibits development tip, achieving enhancement noise reduction. The experimental results show with a 10° 90% 8% can effectively reduce fan’s broadband within 200~1000 Hz 0.54~2.68 dB (A) different operating conditions. Additionally, reasonably designed reduced loudness roughness in rated conditions, studied correspondingly improved.