河南密县精煤粉水力特性研究

对轻质模型沙密县煤粉的水力特性进行了试验研究。研究结果表明，煤粉模型沙粗细颗粒的起动特性规律是一致的，其起动流速Ｖ０及扬动流速Ｖｆ均与水深Ｈ呈指数函数关系，即Ｖ０（Ｖｆ）＝ａＨ＾ｂ；单宽输沙率ｑｓ与流速Ｖ呈四次方关系，即ｑｓ＝ＫＶ＾４；试验还对煤粉模型沙的糙率进行了探讨，发现糙率随流速的增大而减小，并逐渐趋近一常数值。

THE MOVEING LOW OF COAL POWDER IN FLOW

Through experiment, the moving low of coal powder in flow can be studied. Both pick up velocity V 0 and lift up velocity V f are related the flow depth H , It can be expressed as V 0 (or V f )=a H b , the sediment flux per unit q s and flow velocity V can be expressed as q s= K V 4 . When V increasing, the roughness n b is decreasing and down to a constant.