浮帘群水流阻力特性试验研究

发布时间：2018-09-10 21:03

【摘要】：为探明含浮帘群水流的阻力特性和各阻力参数计算方法,对不同间距、不同高度浮帘群在不同恒定均匀明渠流中的阻力特性开展了92组水槽试验。通过拟合水面线获得水力坡降,探讨浮帘拖曳力系数、曼宁糙率和达西韦斯巴赫阻力系数的变化规律。研究结果表明:浮帘群布置存在临界间距,此时浮帘间的相互干扰作用几乎消失;浮帘群消能增阻作用明显,其拖曳力系数在不同水流条件下变化较小,取值介于1.60~2.05之间;曼宁糙率主要与浮帘相对高度及浮帘分布密度有关,并获得了曼宁糙率的修正计算方法;达西韦斯巴赫阻力系数可由浮帘相对高度、浮帘分布密度及浮帘雷诺数组成的拟合公式获得。
[Abstract]:In order to find out the resistance characteristics of flow with floating curtain group and the calculation method of resistance parameters 92 groups of flume tests were carried out on the resistance characteristics of floating curtain group with different spacing and height in different constant and uniform open channel flow. The hydraulic gradient was obtained by fitting the surface line, and the variation law of drag coefficient of floating curtain, Manning roughness and drag coefficient of Darcy Weisbach were discussed. The results show that the critical spacing exists in the arrangement of floating curtains, and the interaction between floating curtains almost disappears, and the energy dissipation and drag increase of floating curtains are obvious, and the drag force coefficient of floating curtains varies slightly under different water flow conditions, and the value is between 1.60 and 2.05. Manning roughness is mainly related to the relative height of floating curtain and the distribution density of floating curtain, and the modified calculation method of Manning roughness is obtained, and the drag coefficient of Darcy Weisbach can be calculated from the relative height of floating curtain. The fitting formula of the distribution density and Reynolds number of floating curtain is obtained.
【作者单位】：上海交通大学船舶海洋与建筑工程学院;
【基金】：国家自然科学基金(51179101)
【分类号】：TV147

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