Active control of noise generated from axial-flow turbomachinery

轴流式涡轮机械噪声的主动控制

• 批准号: 02650125
• 负责人: MATSUUCHI Kazuo
• 金额: $ 1.02万
• 依托单位: Institute of Engineering Mechanics, University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650125/
• 关键词: Turbomachinery; Rotor-stator interaction; Active control; Mode coupling; 騒音

Our experiments are divided into two parts. One is concerned with the fundamental features of pressure fluctuations in the stage which is important in handling the noise. The other is the active control of the noise by adding sound pressure with loud speakers.The main results of the former experiment are summarized as follows :1. The magnitude of the pressure fluctuation, the intensity of the cross-spectrum and the sound pressure level vary similarly for the change of flow rates. This means that the fluctuation is closely related to the generated noise.2. The pressures on a rotor blade fluctuate in phase and have almost the same magnitude over a blade. Such a remarkable feature cannot be explained by the existing theories.3. As a reason for this, it is assumed that compressibility plays a part due to high unsteadiness.The latter experiment was done to know the usefulness of active control and also to obtain the fundamental data. The result shows that our approach to the active control is much effective. The main results are as follows :1. The reduction of overall noise was obtained by about 11 dB and that corresponding to the blade passing frequency by about 23 dB.2. The phase and the amplitude of sound pressure added by loud speakers coincide with those predicted by the theory.

我们的实验分为两部分。一是涉及级中压力波动的基本特征，这对于处理噪声很重要。另一种是通过扬声器增加声压来主动控制噪声。前一实验的主要结果总结如下： 1．压力波动的幅度、互谱的强度和声压级随着流量的变化而变化类似。这意味着波动与产生的噪声密切相关。2．转子叶片上的压力同相波动，并且叶片上的压力几乎相同。这一显着特征是现有理论无法解释的。3．其原因是，由于高度不稳定，压缩性起了一定的作用。后一个实验是为了了解主动控制的有用性并获得基础数据。结果表明我们的主动控制方法非常有效。主要结果如下： 1．总体噪声降低约11 dB，与叶片通过频率对应的噪声降低约23 dB.2。扬声器所施加的声压的相位和幅度与理论预测的一致。

项目成果

松内 一雄,安達 勤: "圧力変動のモ-ド変換による軸流送風機騒音の低減" 日本機械学会 流体工学部門講演会講演論文集. 910ー50. 260-262 (1991)

Kazuo Matsuchi、Tsutomu Adachi：“通过压力波动的模式转换来降低轴流式鼓风机噪音”，日本机械工程师学会流体工程分会论文集，910-50 (1991)。