摘要
为了降低空调室外机叶轮的气动噪声和改善其振动性能,提出了一种空调室外机叶轮尾缘结构改型设计方案,以空调室外机三叶片叶轮为研究对象。在实验室进行了叶轮模态试验、动频试验、振动噪声耦合试验。结果表明:尾缘锯齿结构可以改良叶轮模态参数,其中前5阶固有频率提高了3.45%~20.35%,2~5阶阻尼比提高了2.97%~30.46%;并调整振动频率特性曲线走势,使频宽、共振转速分别降低了0.74 Hz、23.76 r/min,共振裕度提高了3.40%;同时使叶轮1阶、2阶振动频率分别降低了3.36%~5.56%,1.09%~1.74%,旋转基频和叶尖位置的声压级分别减小了4.99%~5.37%,3.90%~4.50%;随着离心力载荷的增大,叶轮的1阶、2阶振动频率增大,且旋转基频和叶尖位置的声压级也增大,说明空调室外机叶轮的振动噪声和声压级具有正相关关联。
In order to reduce the aerodynamic noise and improve the vibration performance of the impeller of the outdoor air conditioning unit,a modified design scheme for the trailing edge structure of the impeller of the outdoor air conditioning unit was proposed.The three-blade impeller of the outdoor air conditioning unit was used as the research object.Impeller modal tests,dynamic frequency tests,and vibration noise coupling tests were conducted in the laboratory.The research results show that the serrated structure of the trailing edge can improve the modal parameters of the impeller,with the first five natural frequencies increased by 3.45%~20.35%,and the second to fifth damping ratios increased by 2.97%~30.46%;And by adjusting the trend of the vibration frequency characteristic curve,the frequency bandwidth and resonance speed were reduced by 0.74 Hz and 23.76 r/min,respectively,and the resonance margin was increased by 3.40%;At the same time,the first and second order vibration frequencies of the impeller were reduced by 3.36%~5.56%,1.09%~1.74%,and the sound pressure levels at the rotating fundamental frequency and blade tip position were reduced by 4.99%~5.37%,3.90%~4.50%,respectively;As the centrifugal force load increases,the first and second order vibration frequencies of the impeller increase,and the sound pressure level at the rotating fundamental frequency and blade tip position also increases,indicating a positive correlation with the vibration noise of the outdoor air conditioning unit impeller.
作者
代元军
何振雄
李保华
吴柯
DAI Yuanjun;HE Zhenxiong;LI Baohua;WU Ke(College of Mechanical and Electrical Engineering,Xinjiang Agricultural University,Urumqi 830052,China;Mechanical College,Shanghai Dianji University,Shanghai 201306,China;School of Energy Engineering,Xinjiang Institute of Engineering,Urumqi 830091,China)
出处
《流体机械》
CSCD
北大核心
2023年第9期7-12,41,共7页
Fluid Machinery
基金
国家自然科学基金项目(51966018,51466015)
新疆高校科研计划自然科学重点项目(XJEDU2019I027)
新疆高校科研计划自然科学青年项目(XJEDU2021Y051)。
关键词
空调室外机
模态分析
固有频率
振动
噪声
air conditioning outdoor unit
modal analysis
natural frequency
vibration
noise
