Experimental study on characteristics of fluctuating pressure in of special-shaped plunge pool slabs with changing gap width
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Abstract:
In hydraulic engineering, the plunge pool is the key to the safety of protecting structure. It affects whether the dam can operate safely or not under impact of high-speed water flow. Based on a plunge pool hydraulic model test and its results, this paper discussed the characteristics of fluctuating pressure acting on the under-surface of the slab with different gap widths. The analysis results showed that in the stable hydraulic jump area, the fluctuating pressure intensity coefficient of slab with keyway increased with the increase of the gap width between slot plates. The probability density distribution was in accordance with the normal distribution. When the gap width increased, the maximum fluctuating uplift force decreased. At the same point, the greater the gap width was, the greater the average eddy scale and spatial integral scale were. With the decrease of the gap width, the pressure fluctuation energy of slab was concentrated more on low frequency section.
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