摘要：基于模型试验结果，研究了突扩式跌坎消力池底板脉动压强特性，分析了突扩式跌坎消力池及非突扩跌坎消力池底板脉动压强的幅值特性、相关特性和频谱特性。分析结果表明：突扩式和非突扩跌坎消力池底板脉动压强最大值均出现在池首位置，且呈沿程衰减趋势；突扩式跌坎消力池能显著降低底板的脉动压强水平，突扩比1.3时最大值降低了63%，突扩比1.6时最大值降低了42%；突扩式和非突扩跌坎消力池底板脉动压强概率密度基本符合正态分布；在冲击区，突扩式跌坎消力池底板脉动压强空间积分尺度较非突扩式有显著降低，即其消力池内涡旋保持性有所降低；与非突扩式相比，突扩式跌坎消力池底板冲击区脉动压强优势频率向高频移动。

Abstract: Based on the results of the model test, the fluctuating pressure characteristics of the bottom of stilling basin with drop sill and sudden expansion are studied, and the amplitude characteristics and correlations of the fluctuating pressure of the bottom of the sudden expansion stilling pool and the non-sudden expansion stilling pool are analyzed. Characteristics and spectral characteristics. The analysis results show that the maximum value of the fluctuating pressure of the bottom of the sudden expansion and non-sudden expansion stilling pools appears at the head of the pool, and shows a trend of attenuation along the way; the sudden expansion of the stilling pool can significantly reduce the fluctuating pressure of the bottom When the sudden expansion ratio is 1.3, the maximum value is reduced by 63%, and when the sudden expansion ratio is 1.6, the maximum value is reduced by 42%; the probability density of the fluctuating pressure on the bottom of the sudden expansion and non-sudden expansion stilling pool is basically in line with the normal distribution; In the impact area, the spatial integral scale of the fluctuating pressure of the bottom plate of the sudden expansion stilling pool is significantly lower than that of the non-sudden expansion, that is, the vortex retention in the stilling pool is reduced; compared with the non-sudden expansion, the sudden expansion The dominant frequency of the fluctuating pressure in the impact area of the bottom plate of the stilling pool moves to high frequency.

国家自然科学基金(51409155)