摘要
明槽的浆体输送在过去的设计计算中，或者使用清水公式，或者使用经验公式，计算精度偏低。本文从颗粒悬浮输移的机理出发，把输送的非均匀颗粒分成粗细两种，并认为细颗粒和水充分混合形成浆体，增加了水流的粘性，抑制了水流的紊动，减少了水流的能耗；粗颗粒要保持悬浮或者输移需要消耗水流的能量。推导了计算明槽浆体输送水力坡降及临界淤积流速的公式，并通过实测资料进行了验证，取得了满意的效果。本文公式给工业明槽设计提出了新的水力计算方法。
The transportation of slurry in open-channel is usually calculated by using either equations for clear water or empirical formulas, with an unsatisfactory accuracy.In this paper, an equation for hydraulic slope of slurry flow in open—channel and a formula for the critical non-settling velocity are developed according to the consideration that the transported non-uniform solid particles are divided into two parts-coarser grains and fine grains. The fine grains and water are sufficiently mixed into slurry, which affecting the viscosity, turbulent and energy lost of water flow; the coarser grains are suspended in transporting,which consuming the energy of water flow. These equations are verified with experimental data. The new hydraulic calculating method is proposed for open-channel designing.
出处
《有色金属》
CSCD
1997年第2期20-25,共6页
Nonferrous Metals
关键词
明槽
浆体输送
水力坡降
临界淤积流速
open—channel
transportation of slurry
hydraulic slope
criticalnon—settling velocity
