水头

在模型试验的基础上，应用k-ε紊流数值模型，采用VOF方法，对低水头大流量厂坝联合泄洪消能流场进行了二维数值模拟。

On the basis of model test , a 2D numerical simulation on the flow field of discharge from surface-bottom outlet on low waterhead and big flux was made by adopting k - ε turbulence model and VOF method .

低水头水电站技术供水系统的改造

Reform of the Low Waterhead Power Station Technology Supply Water System

解出边界上的全部H和以后，可算出内部的水头和流量。

Then the head H and discharge in the interior of the region can be compared .

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

U形渠道是灌区广泛推广的灌溉渠道，其具有占地面积少、水头损失小等特点。但U形渠道流速分布规律及其流量测量仍处于研究阶段。

U channel is extensively used in irrigated region , but velocity of flow distributing rule and flux measurement for U channel is being on research stage still .

本文针对转桨式水轮机在开发低水头水力资源中的应用，提出了一种基于PCC的步进式水轮机双调整调速器。

A PCC based stepping motor driven dual control governor for Kaplan turbine is presented in this paper .

在此基础上，定义了降比r和压比G，根据r的大小，讨论了均匀坡毛管压力水头的分布；

This paper also defines the reducing ratio to be r and the pressure ratio to be G , and according to the value of discusses the distribution of lateral pressure head on the uniform slope .

安装Kaplan水轮机的低水头水电站，轴向水推力是一个重要的设计和安全运行指标。

The axial thrust is an important indicator for design and safety consideration in hydroelectric power stations using Kaplan turbines .

三峡水电站ALSTOM机组低水头运行稳定性分析

Research on the low-head operation stability of left-bank ALSTOM generator units of Three Gorges Hydropower Plant

射流器助吸装置使用方便，资助水头一般为2～4m，能明显改善离心泵吸水性能；

It is convenience to use Jet device increase water head by 2-4 meters high , improving the absorption performance clearly ;

比较了砂滤和纤维球过滤对浊度、COD、SS和油的去除情况，及其在水头损失、过滤周期和产水量等方面的异同。

The sand filtration is compared with fibre-ball filtration on the removal rate of turbidity , COD and SS , and on the head losses , filtration period and filtrate .

地面沉降与地下水头下降之间普遍呈现显著线性相关关系的事实反过来表明，储水层的垂向释水压密变形规律基本符合Jacob假定；

The actually ubiquitous linear correlations between land subsidence and aquifer drawdown conversely indicate that vertical compaction of water-bearing formations agrees with the vertical elastic deformation assumption .

此装置只要0.1m以上的自然水头就可过滤。

This device could work as long as natural water head is more than 0.1M .

长期以来，我国水电站水轮机进水阀选择蝴蝶阀或球阀通常以200m水头为界。

For a long time , the head limit of choosing butterfly valves or spherical valves for inlet valve of turbine is 200 m as usual .

本文应用Garrett－Jones媒介能量理论，在浙江省苍南县水头乡用溴氰菊酯喷洒蚊帐，对中华按蚊传疟作用的影响进行了定量调查。

This report used the vector capacity theory of Garrett-Jones to study the effect of controlling malaria transmission by An , Sinensis after spraying mosquito-nets with Deltamethrin .

基于GEO-SLOPE分析高水头作用下水库对隧道的渗流影响

The Analysis of Effects of Reservoir under the High Water Head upon Tunnel Seepage Flow Based on GEO-SLOPE

同时，基于SVM算法建立了各个水源供水量和水源供水水头、用水量之间的定量关系，较好的解决了供水系统优化调度研究中宏观建模的问题。

Furthermore , relationships between pump station flow and pump station head , total system water demand based on SVM were established , which solved the problem of macroscopical modeling for the second part of optimization and operation of water supply system .

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 ;

额定水头的效率峰值对应的工况点N[η（max）]具有可选定性，是效率峰值移动的基准点，它反映了转轮具有较高能量指标和较好的稳定性的共同要求。

The rated head efficiency peak operation point N [ η( max ) ] is taken as the reference point for peak efficiency movement , it reflects the high energy performance and a good stability of a runner , the point is selectable .

在120m承压水头下采用液压伸缩式水封，刷新了潜孔弧形闸门使用该种水封的国内记录。

The hydraulic expansion seal has been adopted under the artesian head of 120 m , which breaks the domestic record of such seal used in submerged radial gate .

对于半成岩或成岩含水层以及水头下降小于10m的粘性储水层和松散砂性含水层，渗透系数为常数，水流方程呈线性。

For loose sandy aquifers and shallow water-bearing clay deposits with their drawdown less than 10m , or for rock or semi-rock aquifers , hydraulic conductivity can be treated as a constant and the flow equation is linear .

在水头H＝32m转轮出口相对流速W＝17m／s条件下，原转轮在浑水期运行45天后，转轮上下迷宫环密封全部磨平，效率下降到65%〔1〕。

The operation head is 32m , and the relative velocity of runner outlet is 17m / s. Under above case , the conventional labyrinth sealing structure was rubbed down in 45 days , efficiency is a drop of 65 percent .

峡江水电站是低水头（额定水头为8.57m）水电站。

Xiajiang hydraulic power station is a low water head station . The rated head is 8.57m .

近些年来随着我国水能资源的开发，我国设计和修建了一批坝高在300m级别的水利枢纽工程，其共同的典型特点是：高水头、大流量、窄河谷。

With the hydropower resources development in recent years , a batch of high dams is under design or construction in China , their common characteristics are : with high water head , with large discharge and narrow valley .

本文讨论了应用在变水头流量标准装置中的Z-80计算机系统，详述了其硬件设计和软件设计。

In this paper the authors treat of the application of Z-80 computer system in the variable head flowrate standard device , and give a minute description of the design of hardware and software .

作为简化，本文主要考虑了定水头情况下出力和流量为线性和非线性关系下如何协调日电量市场和AGC市场的用水以达到收益最大。

As the result of simplification , there is the main consideration about the conformity under the relation of linear and nonlinear , which is the load and flux of fix head , thus gain the most profits by accord with energy market and AGC market .

泄洪隧洞工作水头达120m，采用双孔合一的闸门布置形式，高水头大流量的泄洪消能问题十分突出；

The maximum operation head of spillway tunnels is 120m , two orifices of water gate combine to be a hole in the spillway tunnels , the problem of discharge and energy dissipation is very complex ;

本文用有限元法及实验方法研究了溢流槽在小水头（小于30mm）情况下溢流的流体运动规律。

This article presents several new ideas about the behavior of water flow over an overflow channel ( weir ) under small head ( less than 30 mm ), based on both finite element method and experiments .

该研究假设土壤水力动力特性可用Brooks-Corey模型来描述，结合Darcy定理和质量守恒推导了基于两组负水头下入渗数据来估计Brooks-Corey模型参数的方法。

Taking an assumption that soil hydraulic properties could be described by Brooks-Corey model , the Brooks-Corey model parameters based on soil water infiltration data under two different negative water pressures by combining the Darcy theorem with mass conservation were discussed .

利用本文推导的曲线方程，设计总水头一定，即可得到相应的曲线型实用堰渥奇（Ogee）剖面上游复合圆弧段的曲线方程。

By using the deductive curve equation in the paper , as the designed amount of gross water is definite , correspondingly the curve equation in the upstream complex-arc segment of practical curve-shaped dyke on its Ogee section could be gotten .