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pumping system
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  pumping system
The repetition period will be 2 hours, and sampling will be by a winch-operated submersible pumping system which will continuously scan the radon-deficient layer.
      
An efficient pumping system made from association of cryo and turbo molecular pumps allows a background hydrogen pressure of ? 10-5 Torr during the growth.
      
The energy balance of the pumping system with the line is analyzed from the viewpoint of optimizing the pumping efficiency of metal-vapor lasers.
      
Results on this new fiber optic interface system are compared with those obtained previously with the traditional pumping system.
      
A traditional dissolution pumping system was recently replaced with a fiber optic interface between the spectrometer and the samples.
      
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In the investigations of hydraulic transients behavior of pumping system, part cularly in pumped storage plants, to start reversible unit under both conditions of reverse flow reverse rot■tion and reve■se flow zero rotation, is a problem deserved to be studied and has its economical offect.Pumping system having parallel centrifugal pumps (without check valve) is used as an example herein, it is assumed that pump 1 operating at normal condition and pump 2 is taken into consideration of the following...

In the investigations of hydraulic transients behavior of pumping system, part cularly in pumped storage plants, to start reversible unit under both conditions of reverse flow reverse rot■tion and reve■se flow zero rotation, is a problem deserved to be studied and has its economical offect.Pumping system having parallel centrifugal pumps (without check valve) is used as an example herein, it is assumed that pump 1 operating at normal condition and pump 2 is taken into consideration of the following three specified cases:1. Power failure caused by error of operation;2. Starting-up at runaway speed condition;3. Starting-up at braking condition by ratchat.According to the computer program proposed by the author, the instantanecus variations of dimensionless parameters of pump 1 and pump 2 are analysed.Meanwhile, for the purpose of further analysing the time of valve closure which influarc(?)s the starting behavior of pumps, the results for the case when pu■ p 2 starting-up before the opening of valve 2 are also shown in this paper.

在抽水系统水力过渡特性的研究中,尤其在抽水蓄能电站中,可逆机组在倒转、倒沉及零转、倒流时启动,是一个值得研究和具有经济价值的问题。本文以并联离心泵抽水系统为例(没有逆止阀),假定泵1正常运行,而泵2考虑: 1、由于误操作等事故而引起的电力中断; 2、在倒流倒转即飞逸情况下启动; 3、在倒流零转即棘轮制动情况下启动。据此编制了电算程序,分析了泵1及泵2转数比、转矩比、水头比及流量比等无因次参数的瞬态变化规律。同时,为了进一步分析开阀时间对水泵启动特性的影响,文中也给出泵在阀开启前而启动的过渡特性结果。

In this paper, by means of dimensionless analysis, the similarity requirements for modeling waterhammer in the pumping systems are developed from the basic equations of waterhammer, and the relationship of similarity for various boundary conditions is set up. Considering the features of cooling water system in the large steam electric power station, the application of the similarity theory to the experimental model studies of power failure to the pumps is studied. Based on the results of model experimeats,...

In this paper, by means of dimensionless analysis, the similarity requirements for modeling waterhammer in the pumping systems are developed from the basic equations of waterhammer, and the relationship of similarity for various boundary conditions is set up. Considering the features of cooling water system in the large steam electric power station, the application of the similarity theory to the experimental model studies of power failure to the pumps is studied. Based on the results of model experimeats, the effects of the closure precedure of the valve at the discharge side of the pumps on the waterhammer caused by power failure to the pumps are analysed, and conclusions valuable to the project design are obtained.

本文从水锤基本方程出发,用无量纲分析导出泵系统水锤模型相似准则,并推导出各类边界条件的相似关系。然后结合大型火力发电机组循环冷却水系统的特点,研究了相似理论在事故停泵模型试验研究中的应用,并根据模型试验的结果,分析了水泵出口阀的关闭程序对事故停泵水锤的影响,得出了对工程设计有价值的结论。

The mathematical models of boundary conditions for complex pumping system areset up with the use of basic theory of waterhammer and the characteristics method. The hydraulic transients in a pumping system applying surge shafts and controllable valves. as waterhammer protection measures are analyzed and the economic cross-sectional areas of theshafts proposed. A great deal of computation shows that the effective layout of surge shaftsand suitable determination of the program of valve closure can avoid...

The mathematical models of boundary conditions for complex pumping system areset up with the use of basic theory of waterhammer and the characteristics method. The hydraulic transients in a pumping system applying surge shafts and controllable valves. as waterhammer protection measures are analyzed and the economic cross-sectional areas of theshafts proposed. A great deal of computation shows that the effective layout of surge shaftsand suitable determination of the program of valve closure can avoid water calumn seperationand confine the waterhammer pressure in a limited range.

以山西省引黄入晋抽水系统为研究时象.建立了复杂抽水系统水力过渡过程计算的边界条件数学模型,并对以调压井和可控间作为防护手段的抽水系统事故停泵水力过渡过程进行了计算,提出了调压井稳定要求的经济断面.大量计算表明,有效地设置调压井并合理地确定可控阀的关阀程序,可避免抽水系统中水柱分离的产生,同时将压力管道中水锤压力的升高限制在允许的范围内.

 
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