Reduction of Ceiling Fan Noise by Serrated Trailing Edge

摘要

Six ceiling fan blade models with different types of trailing edge serrations were created and were simulated using commercial software in the present studies in order to investigate the effectiveness of various trailing edge serrations in reducing fan blade trailing edge noise. They were original, flat tip, serrated, rectangular, half flat tip and half rectangular half flat tip fan blades. The simulation results showed that the half flat tip fan blade had the best acoustical performance where it could obtain an overall noise reduction of 13.9 dBA followed by rectangular fan blade with 10.9 dBA, flat tip fan blade with 9.2 dBA, half rectangular half flat tip fan blade with 5.0 dBA and serrated fan blade with 4.7 dBA. The effectiveness of TE serrations in reducing trailing edge noise was also proven through experimental testing in an anechoic chamber in the present studies.