浑水脉动压力试验研究

Experiment Study on the Fluctuating Pressure of Muddy Water

在对量测技术进行研究和改进的基础上，对不同流态区清水和浑水脉动压力进行了系统的对比观测。试验结果表明：高含沙浑水不再属牛顿体而变为宾汉体，浑水的紊流结构发生变化。浑水脉动压力均方根和强度系数随含沙量增加呈直线关系增大，以浑水水柱表示的脉动压力均方根和强度系数，浑水和清水没有区别。水流含沙后，浑水紊流结构的变化，并没有改变紊流结构中旋涡含能分布规律，紊动能仍然集中在大、中尺度旋涡中，所以，浑水和清水脉动压力功率谱看不出任何区别。

In a conceptual model,fluctuating pressure of clear water and muddy water is measured with improved measuring techniques.The results show that muddy water with hyperconcentration of sediment is no longer a Newtonian fluid but a Bingham fluid.The turbulent structure of muddy water hAs changed greatly. Root mean square of the fluctuating pressure and intensity coefficient of muddy water increase linearly with increasing of sediment concentration. There is no difference of the root mean square of the fluctuating pressure and intenSity coefficient of the clear and muddy water if they are expressed by the head of muddy water.The change of turbUlent structure doesn't influence energy distribution law of the turbulent eddied. Turbulent energy concentrated mainly on large and middle sized eddies. The power spectrum of clear water is just eddies.The power spectrum of clear water is just the same with that of muddy water.