水轮机的有效水头(外文翻译)

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原文档由会员 xiaowei 发布

水轮机的有效水头(外文翻译)

包含中文翻译和英文原文,内容详细完整,建议下载参考!

中文: 4000字
英文: 14300字符



1、毛水头是指的是厂房之前的上游高水位和尾水管出口的尾水位之差。
2、静态头可以解释为毛水头减去所有发生蜗壳之前的损失。如果尾水管只可衡量不准确,或根本不能测量,出口横断面和实际测量断面的损失,应当加到被扣除的总和里。
3、由于比能实际上不能准确被定义为静水头,或者净水头,还应当确定,以保证转轮效率。有效水头定义为两个比能源的差值,即蜗壳进口处的比能和尾水管出口的比能之差。利用图1我们可以写出净水头的公式 ......



EFFECTIVE HEAD OF WATER TURBINE

1. The gross head is the difference between headwater elevation immediately before the station and tail-water elevation immediately after the exit from the draft tube.

Fig.1 Net or effective head

2. The static head can be derived from the gross head by subtracting all the losses occurring in the passage before the scroll case. If the elevation of water immediately below the draft tube can be gauged only inaccurately, or not at all, the losses between the exit section and the site of actual gauging shall be added to the amount of losses to be subtracted.
3. Since the energy head actually available for the turbine cannot precisely be defined by the static head either, the net head, or effective head, shall also be determined in order to check the guaranteed wheel efficiency. The effective head is defined as the difference between two energy heads, viz., between the energy head at the entrance to the scroll case and the one at the exit of the draft tube. Using notations of Fig.1 we can write for the net head ......

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