Chiu and seman ( 1971 ) studied the head loss of flows transporting sediment in circular and square pipes with spiraling motion 邱和思门（ 1971 ）研究了在圆管和方形管中输沙时具有螺旋运动的水流的水头损失问题。
These phenomenon jeopardize the condition of the project seriously , and it is the main factor that influences the loss of local water head 这些现象严重危害管道的工况,并且是影响阀道局部水头损失的主要因素。
Observing wash degree , bulging ratio and distributing of filtrating material . measure turbidity of filtrate and reduction of hydraulic pressure 观察反冲洗膨胀率、冲洗强度及滤层分布情况。测定滤后水浊度及水头损失。
This paper has also created two equations of hydraulic pressure loss and clarify by analyzing experiment fruits of iron ceramics filter 通过对实验结果的统计分析，文章还建立了适合涂铁陶粒滤料滤池的初始水头损失方程及过滤澄清方程。
Loss of head is minimized by the balanced disc and its " aerofoil " design . streamlined body without pockets contributes to straight - through flow 通过平衡阀瓣及其“翼型”结构，将水头损失(或位差损失)降到最小程度。流线型阀体，不再需要凹穴来帮助流体直线流通。
The article builds up computer module of hydraulic computation : computation module of point measuring method , of area method , of the loss in head of part and of result show 建立了水力计算计算机模块：逐点法计算模块、面积法计算模块、局部水头损失计算模块和结果显示模块。
Ulteriorly , considering the local head loss in inlet opening and pipes junction plays more important role in the calculative results of water hammer pressure calculation of the short pipeline system 考虑进口及多管道连接处的局部水头损失对短管道系统水击压强的计算结果影响较大。
By sampling in different filter layer and analyse of water head damage in all sampling point , i draw a condusion about filter function of porcelain sand filter is superior to the general filters 通过滤层分层取样，对各取样点的水头损失的分析，得出瓷砂滤料较一般滤料过滤性能优越的结论。
The flow regime , sediment deposition and the loss of head of two head tanks of the sewage pumping station with different dimensions are studied by using a hydraulic model test method 摘要采用水力模拟的方法对两个不同结构尺寸的污水泵站高位井的水流流态、泥沙淤积及水头损失等进行了模型试验。
Compared with conventionally rapid filter , upflow filtration is a more sensible filter method , which is characterized by large capacity for storage of solids , small head loss and long filter run 上向流过滤是一种理想的过滤方式。与传统快滤池相比具有滤层截污量大，水头损失小，过滤周期长等特点。
