| CAVITATION CONTROL BY AERATION AND ITS COMPRESSIBLE CHARACTERISTICS |
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| 作者姓名： | DONG Zhi-yong SU Pei-lan |
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| 作者单位： | DONG Zhi-yong School of Civil Engineering and Architecture，Zhejiang University of Technology，Hangzhou 310032，China SU Pei-lan School of Forestry，Shanxi Agricultural University，Taigu 030801，China |
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| 摘 要： | 1. INTRODUCTION So far a lot of high dams that are greater than 100 m in height have been constructed in China. And many super high dams over 200 m in height, such as those at the Ertan and Longtan Hydropower Stations, were completed or are under construc…
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| 关 键 词： | 气穴控制 压缩波 振动波 最小空气浓度 声速 压缩比 |
| 收稿时间： | 2006-02-16 |
CAVITATION CONTROL BY AERATION AND ITS COMPRESSIBLE CHARACTERISTICS |
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| DONG Zhi-yong SU Pei-lan.CAVITATION CONTROL BY AERATION AND ITS COMPRESSIBLE CHARACTERISTICS[J].Journal of Hydrodynamics,2006,18(4):499-504. |
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| Authors: | DONG Zhi-yong SU Pei-lan |
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| Affiliation: | 1. DIATI, Politecnico di Torino, Italy;2. Mathematical Biology and Physiology, Department of Electronics and Telecommunications, Politecnico di Torino, Italy;3. Vall d’Hebron Institute of Research (VHIR), Universitat Autònoma de Barcelona, Barcelona, Spain;2. Department of Neurology, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan;3. Global Center for Medical Engineering and Informatics (MEI Center), Osaka University, Suita, Osaka 565-0871, Japan |
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| Abstract: | This paper presents an experimental investigation and a theoretical analysis of cavitation control by aeration and its compressible characteristics at the flow velocity V=20m/s-50m/s. Pressure waveforms with and without aeration in cavitation region were measured. The variation of compression ratio with air concentration was described, and the relation between the least air concentration to prevent cavitation erosion and flow velocity proposed based on our experimental study. The experimental results show that aeration remarkably increases the pressure in cavitation region, and the corresponding pressure wave exhibits a compression wave/shock wave. The pressure increase in cavitation region of high-velocity flow with aeration is due to the fact that the compression waves/shock wave after the flow is aerated. The compression ratio increases with air concentration rising. The relation between flow velocity and least air concentration to prevent cavitation erosion follows a semi-cubical parabola. Also, the speed of sound and Mach number of high-velocity aerated flow were analyzed. |
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| Keywords: | cavitation control by aeration compression wave/shock wave least air concentration speed of sound compression ratio |
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