The impulse turbine unit is normally used in high water-head power stations, whose diversion system is long and is likely to cause pressure fluctuation.
高水头电站一般采用冲击式水轮发电机组，引水系统长，容易产生水压波动。
If it were possible to develop a turbine that did not need such a water-head to operate, and that could sit in the riverbed, then a dam would be unnecessary.
如果有可能制造出一种涡轮无需水的落差来运转，并且可以放置在河床上，那么就不再需要大坝了。
Its shortcomings include harsh restriction for suspended solid in influent, low phosphorus removal efficiency, high water-head loss and the height of lifting sewage.
但同时也存在对进水悬浮物要求较高，磷去除率低，水头损失大，污水提升高度大等问题。
The water closed over his head.
水没过他的头顶。
I bashed him on the head and dumped him in the water.
我猛揍他的头，然后把他扔到了水里。
Mr. Rylance makes an astonishing entry, flinging himself into a handstand on a tank of water and dunking his whole head in.
里朗斯先生做了一个夺人眼球的动作，他把自己倒立在一个水箱中，整个头部全部浸入。
We are keeping our head above water, but our cash flow position is not too good.
我们虽然还未陷入困境，但资金流转状况不太好。
Teri and Kim head for the water tower alone with Jack and Rick not far behind.
泰瑞和金姆独自向水塔方向行进，杰克和里克就在不远处。
He ran back with a bottle of water and sprinkled the water on his daughter's head.
他拿着一瓶水跑回来，把水洒在了女儿的头上。
It lifted its head to drink the water in my son's cup.
它抬起头来喝我儿子杯子里的水。
The weight of the ball causes the dragon's head to move down and the dragon's tail pulls the water bowl back up.
球的重量使龙头向下移动，龙尾将水碗拉起来。
The utility model relates to a forge and press combined type central water-cooled oxygen lance spray head assembly.
本实用新型涉及一种锻压组合式中央水冷氧喷枪喷头总成。
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。
The turbine for the Three Gorges Project is one of the mixed-flow turbines with great changes of operation water head.
三峡电站水轮机是运行水头变幅最大的混流式水轮机之一，其外形尺寸和重量亦是当前混流式水轮机之最。
Protection design for lower reaches of the Yellow River was once a difficult question due to high water head, various combinations of discharging structures, and complex flow pattern.
小浪底工程由于水头高、泄水建筑物组合多，水流流态十分复杂，下游防护设计是一难题。
The hydraulic turbine unit frequently operates under the low water head, exists the questions of unstable operation and cavitation in Mania hydropower station.
满拉水电站水比机组经常处在低负荷下运行，存在着局部空蚀破坏和运行不稳定两大问题。
The effect of practice showed that the seepage prevention wall is beneficial to reducing the seepage water head, decreasing the seepage line inside dike and escape gradient.
实际应用显示钢板桩的实施有利于减小渗流水头、降低堤身浸润线和出逸比降。
It is also part of the watertight envelope, and subject to the local water head.
它也是水密外壳的组成部分，并承受局部水压力。
A mathematical model whose variable is water head can simulate the effects of water head and properties of subsurface irrigation pipe on irrigation.
以压力水头为因变量的数学模型可以模拟供水压力和灌水器特性对灌溉效果的影响。
Finally, some other characteristics of the variable water head standard device for large flow rate have been dealt with and theoretically investigated.
本文对使用的方法进行了初步探讨，并讨论了变水头大流量标准装置的一些其它特性。
According to hydraulic principle, the change of efficient water head, discharge coefficient and discharge of orifice along porous pipes have been discussed and checked by experiments in this paper.
运用水力学原理，对多孔配水管孔口出流量公式的孔口作用水头、孔口流量系数及沿程孔口出流量的变化问题进行了理论分析和试验验证。
Calculation formula of velocity distribution, boundary layer thickness, friction force and loss of water head are given out, in accordance with the result from theory analysis of similitude solution.
对于速度边界层提出了相似性解的解析结果，给出了速度分布、边界层厚度、摩擦阻力和水头损失的解析计算表达式。
Higher water head closure has become a trend with the development of river way closure.
从河道截流的发展趋势来看，高水头截流已成为一种趋势。
However, it is very unpopular for this kind of bifurcation to be laid above the ground surface, especially in the case of large diameter and high water head.
但布置在地面上的明式月牙肋钢岔管尚不多见，特别是当钢岔管承受的水头和直径较大时。
Actually, in the tube engineering, the proportion of the loss of local water head in the loss of pipeline water head is big.
在实际管道工程中，阀门阀道的局部水头损失占管路水头损失的比例是相当大的。
The uncertainty of the parameters may induce uncertainty calculation of water head and velocity of flow, and influence the reliability of the results of groundwater resources appraising.
参数的不确定性将导致计算的水头、流速的不确定性，并影响到地下水资源评价结果的可靠性。
A check valve (3) can prevent the natural chemical absorption water head of the water head when the manual pump or the mechanical pump stops to work.
止回阀(3)起当手压或机械泵停止工作时能阻止水位差的自然吸药。
The type of flow would affect the calculation of water head losses.
管内流态的变化会影响水头损失的计算。
The process and result of the experiment shows in the scheme the assumption of water head diversion by 50% and water-saving rate by 50% is feasible and practical.
试验过程及结果表明，该方案削减船闸工作水头约50%，船舶一次过闸省水率约50%的设想是可行的，合乎实际的。
He jump into the water head over heels.
他头向下地跳进水里。
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