局部水头损失

文中采用VOF方法与标准k-ε紊流模型相耦合，对保水堰的流场进行了数值模拟，计算出了保水堰的局部水头损失系数。

By coupling VOF method and standard k - ε turbulence model , the flow field of water-keeping weir is simulated and the local head loss coefficient of water-keeping weir is obtained ;

倒虹吸有压弯管的局部水头损失系数计算方法比较

Comparison with calculating the coefficient of local head loss models for inverted siphons

铝塑复合（PAP）管局部水头损失的试验研究

On Local Water-Head Loss in PAP Pipeline

建筑内部管道局部水头损失计算新方法

New method for computing the minor head loss in plumbing systems

丁、潜坝局部水头损失的试验研究

Studies on local head losses of spur and submerged dikes

微灌用网式过滤器局部水头损失的试验研究

The Experimental Study on Local Head Loss of Screen Filter in Micro Irrigation

局部水头损失及流量随运行时间呈先缓慢后急剧变化的变化规律。

The local head loss and the flow rate of filters change slowly then rapidly with running time increasing .

在水平进水管保持恒定的情况下，在一定的范围内，随着竖直管管径的增大，局部水头损失增大。

When the level feed is constant , the local head loss will increase with the increment of vertical pipe diameter .

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。

These phenomenon jeopardize the condition of the project seriously , and it is the main factor that influences the loss of local water head .

“三通”结构形式的不同会造成不同的局部水头损失，对灌溉运行费用影响很大，所以对三通结构进行优化，减小灌溉水头和局部水头损失有相当大的意义。

The different structure of the three-way pipe lead to the different local loss of head , it cause a great influence on operating costs of irrigation .

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。

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 .

渡槽渐变段水力学试验的基本目的，是测定渐变段的局部水头损失系数。

The main purpose of the experimental study on the water fow in the transition region of an aqueduct is to find out the local coefficient of head loss in the region .

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。

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 .

具体水力学方法包括：断面流量模数法、宽顶堰淹没出流法、局部水头损失法和恒定渐变流法。

The specific methods include the method of cross section modulus of dischange , method of submerged broad crest weir outflow , method of local head loss and method of gradually varied steady flow .

同时，也利用本程序计算分析了局部水头损失系数对糙率的敏感度，提出局部水头损失对糙率也有很大的影响。

At the same time the sensitivity of bed roughness was calculated due to the coefficient of local head loss with this program and it was found that the coefficient of local head loss has great influence on bed roughness .

这不仅不便于统一确定局部水头损失系数，也不便进行考虑局部水头损失后的明渠恒定非均匀流水面曲线变化规律的定性分析。

This fact is not convenient for defining coefficient of the loss of local water head in unison , neither convenient for considering qualitative analysis of the variation regularity of hydraulic grade line of open channel constant nonuniform flow after the loss of local water head .

对贯通裂隙和非贯通裂隙网络进行渗流分析，据此评价了裂隙几何参数在裂隙网络等效成连续介质时的影响，同时研究了非线性渗流和局部水头损失对渗流场的影响效应。

The seepage in transfixion and non-transfixion fracture network is analyzed . Based on the analysis , the effect of fracture geometry parameter for fracture network equaling to continuum medium is valued . The effect of nonlinear seepage and local water head loss for seepage field is researched .

通过数学分析证明，在不计局部水头损失时，目前常用的几种简化刚性数学模型的最大气压计算结果相等，并与管道内初始充水段长度无关。

The mathematical analysis shows that , with disregarding local head losses and by means of different simplified rigid models , the calculated results of the maximum pressure in a pressurized pipe system containing trapped air mass are equal to and independent of the initial length of the water-column .

将自控阀的局部水头损失引入管网水力计算当中，计算自控阀在每个管段不同开启度条件下对管网压力变化的影响程度，提出管网影响度的概念。

Firstly , the local headloss of the auto-control valve was introduced to the pipe network 's hydraulic calculation . Then , the valve was supposed to be set on each pipe with different opening degree , following which the influencing degree on network was calculated under each situation .

提出了干扰修正系数C，可用于估算局部阻力干扰的水头损失。

It raises the point of interference revision factor C which may be used in the evaluation of head loss for local resistance interference .

对于有局部阻碍的明渠恒定非均匀流，考虑局部水头损失后的水面曲线变化的研究目前比较少，局部水头损失的表达式也不统一。

For open channel constant nonuniform flow which has local holdback , the research considering the change of hydraulic grade line after the loss of local water head is less at present , and the expression of the loss of local water head is not unified either .