Noise Investigation of a Cross Flow Fan with Aperture or Comb Shaped Axial Configurative Tongue Design

• Main Authors: Sen-Yao Fan, 范森堯
• Other Authors: 蔡國隆
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/rmk3r8

碩士 === 國立臺北科技大學 === 車輛工程系所 === 95 === Using acoustical analysis techniques investigate cross flow fan arising from the operation strident sound issues. This research change axial configurative tongue design with aperture or comb shaped ; and adopt laboratory tests to verify its feasibility. The results be proved these different changes can decrease cross-flow fan BPF peak, in particular reduce 8 dB (A) noise effects at specific rpm. Generally, the cross flow fan operating noise totally about 55 dB(A), but in the midnight when prominent frequency noise has become extremely annoying. This research attempted to different axial configurative tongue designed to improve penetrating single frequency noise of cross-flow fan. And further analyze acoustical parameters to fine the best tongue with impeller RSA（Rotor-Skewed Angle）mixed . Through CFD (Computational Fluid Dynamics) analysis software Fluent 6.2 forecast its feasibility and effectiveness. The acoustic analysis results of axial configurative tongue design with aperture or comb shaped can reduce the BPF peak effects. Therefore we can not only receive better sound quality on the experiments, but also get a similar effect in fluent 6.2 simulations.