| 噪声谱的无量纲特性 |
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| 引用本文： | 戚定满,鲁传敬,何友声.噪声谱的无量纲特性[J].上海交通大学学报,1999,33(10). |
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| 作者姓名： | 戚定满 鲁传敬 何友声 |
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| 作者单位： | 上海交通大学工程力学系，上海 200030 |
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| 摘 要： | 应用半球形轴对称头体做了一系列空化噪声实验，得到半球形头体在不同空化数及不同压力下的空化噪声谱．结果表明：头体的空化噪声总声级随空化数而变化，但噪声谱形具有明显的相似形．针对这种相似性，应用无量纲分析方法对噪声谱进行处理，提出了一个噪声声级与空化数的假设，将不同工况下的噪声谱归结到一条曲线上去．该曲线可以作为头体空化噪声谱的特征谱，该特征谱对头体在实际情况下的噪声谱测量具有一定的指导意义
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| 关 键 词： | 无量纲分析 噪声谱 轴对称头体 |
Non-Dimensional Analysis of Noise Spectra |
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| QI Ding man,LU Chuan jing,HE You sheng Dept. of Eng. Mechanics,Shanghai Jiaotong Univ.,Shanghai ,China.Non-Dimensional Analysis of Noise Spectra[J].Journal of Shanghai Jiaotong University,1999,33(10). |
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| Authors: | QI Ding man LU Chuan jing HE You sheng Dept of Eng Mechanics Shanghai Jiaotong Univ Shanghai China |
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| Institution: | QI Ding man,LU Chuan jing,HE You sheng Dept. of Eng. Mechanics,Shanghai Jiaotong Univ.,Shanghai 200030,China |
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| Abstract: | Cavitation noise of some kinds of hemisphere headforms was studied. Measurements of the different flow pattern's noise spectra of hemisphere headforms show that the total noise changes with the cavitation number, but there are many similarities among these shapes of the noise spectra. According to the similar form of the experimental noise spectra of axis symmetric headform, a relation between the total noise level and cavitation number was assumed and the noise spectra obtained in different experimental cases were merged into a characteristic one by means of dimensional method, which may be useful for the prediction of noise level in practice. |
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| Keywords: | non dimensional analysis noise spectra hemisphere headforms |
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