AERODYNAMIC AND AEROACOUSTIC STUDY OF COLLATERAL AXIAL FLOW FAN SYSTEM INSIDE
OUTDOOR UNITOF AIR-CONDITIONER

OUYANG Hua¹  TIAN Jie¹  WU Yadong¹  ZHENG Zhiming²  SUMIO Shiochi²

(1. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200030;
2. DAIKIN Air-conditioning and Environmental Laboratory, Osaka 591-8511, Japan)

Abstract: Both aerodynamic and aeroacoustic performance of collateral axial flow fan system inside outdoor unit of air-conditioner is investigated by particle imaging velocimetry measurement and CFD simulation. The discrete noise frequency is not equal to the upside blade passing frequency, nor the downside rotor, but equal to the integral times of BPF differences between upside and downside rotors. No obvious flow field interaction has been found between upside and downside rotor. Vortex shedding noise prediction model is proved to be effective, with predicted total sound pressure level error less than 3 dBA.

Key words: Aerodynamic noise Air-conditioner Axial flow fan Particle imaging velocimetry

CLC No: TH432.1

上海交通大学—日本大金空调株式会社合作研究资助项目. Received 20061020, received in revised form 20070525