非粘性均匀沙群体沉降运动沉速公式的研究

从相对运动的观点出发,将非粘性均匀泥沙群体沉降运动概化为上升水流在悬浮颗粒层内的运动,通过量纲分析和动平衡状态受力分析,建立了泥沙群体沉降运动中阻力系数和雷诺数的表达式,并分别建立了层流区和紊流区均匀沙群体沉速的理论公式,其结构形式与目前常用的经验公式较为一致。应用实测资料对公式进行验证的结果表明,应用该理论公式的计算值与实测值吻合程度较好。同时通过分析讨论,提出了非均匀沙群体沉降速度问题的解决途径。

Study on theoretic formula of sedimentation velocity in the sediment group settlement zone

Based on the view of relative movement,the population settlement was considered a movement of current moving up in the suspend grain layer. The expression of Reynolds number and drag coefficient are set up by analysing dimension and stress of dynamic equilibrium state. The theoretic formula on uniform sediment popular settlement movement disciplinarian in the laminar zone and turbulent zone are proposed, it is verified by using measured data,and showed that the calculated value by the theoretic formula and measured value agree fairly well. Then solutions to the uneven rate of sediment group settlement are put forward.