Pressure fluctuations measurement and analysis in hydraulic jumps using a microcomputer
作者:
StephenKwok‐Woon Tou,
期刊:
Journal of the Chinese Institute of Engineers
(Taylor Available online 1989)
卷期:
Volume 12,
issue 3
页码: 393-402
ISSN:0253-3839
年代: 1989
DOI:10.1080/02533839.1989.9677173
出版商: Taylor & Francis Group
关键词: hydraulic jumps;pressure fluctuations;spectral analysis
数据来源: Taylor
摘要:
This paper presents a microcomputer based data acquisition system and an analysis of pressure fluctuations in the range of weak hydraulic jumps. Statistical analysis of data shows that the distribution of pressure fluctuations follows the Gaussian probability density function. The maximum pressure fluctuation amplitude is found to be in the range of 2.5 to 3.5 times the standard deviation. The spectral analysis of data indicates that large eddies in the low frequency range of 0 to 20 Hz are predominant over the small eddies in the high frequencies. This result is also predicted by the empirical correlation coefficient. Based on cross correlation analysis, the relationship between areal pressure fluctuations and point pressure fluctuations is developed and can be used to prevent over‐designing the strength of the stilling basins. It shows that the areal pressure fluctuations decrease as the jump longitudinal dimension increases.
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