| 基于非定常流场的离心压气机气动噪声分析 |
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| 引用本文： | 曹林,祁明旭,马朝臣.基于非定常流场的离心压气机气动噪声分析[J].铁道机车车辆,2011,31(Z1):330-334. |
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| 作者姓名： | 曹林 祁明旭 马朝臣 |
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| 作者单位： | 北京理工大学 机械与车辆学院,北京,100081 |
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| 基金项目： | 国家自然科学基金项目(No.51006011); 教育部博士点基金(新教师类,No.20101101120042) |
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| 摘 要： | 对150mm直径车用涡轮增压器离心压气机的流场进行非定常数值模拟,将流场的静压力脉动从时域转换到频域,根据声学原理,对该离心压气机近场声源区的频谱特征进行研究.结果表明,针对本算例,离心叶轮向外辐射的噪声信号在频域上体现出旋转噪声的特性,基频振幅达到了7 000 Pa数量级,而湍流噪声则十分微弱,对压气机的声辐射特性影响很小,基本可以忽略.进一步对湍流噪声的单独分析表明,湍流噪声基频为叶轮的整周通过频率,这是由下游流道的非对称几何结构蜗壳喉部决定的,并且其基频振幅达到了5 000 Pa量级.
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| 关 键 词： | 离心压气机 气动噪声 频域分析 非定常 |
Unsteady Flow-based Aeroacoustics Analysis in Centrifugal Compressor |
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| CAO Lin
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QI Ming-xu
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MA Chao-chen.Unsteady Flow-based Aeroacoustics Analysis in Centrifugal Compressor[J].Railway Locomotive & Car,2011,31(Z1):330-334. |
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| Authors: | CAO Lin QI Ming-xu MA Chao-chen |
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| Institution: | CAO Lin,QI Ming-xu,MA Chao-chen(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China) |
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| Abstract: | Unsteady flow simulation on a 150 mm turbocharger compressor and transformation of pressure pulsation from time domain to frequency domain is performed.Based on aeroacoustics theory and quantitative analysis in frequency domain,the spectrum characteristics related with rotating and turbulent acoustics are studied.Results show that for the investigated compressor,rotating acoustics plays the key role in compressor noise radiation,with amplitude reaching 7kPa in pressure pulsation on blade passing-by frequenc... |
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| Keywords: | centrifugal compressor aero-acoustics frequency analysis unsteady flow |
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