[". 闭식试验台의 기화 여량 값이 개식试验台的小，. 개식试验台의 기화 여량 값이 3.1m이었으나, user

2018-09-18View Original

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继续翻译剩余的文本。

Reply #22018-09-18

闭式试验台测的汽蚀余量是准的。

Reply #32018-09-18

开式试验台不做汽蚀余量

Reply #42018-09-18

为什么开式的不准，差在哪里

Reply #52018-09-18

由于阀门开度减小，流过阀门的流速就越快，从而阀门处的压力降低，产生局部汽蚀。同时阀门开度减小，使液流的状态很差，在流动过程中容易产生气泡，这些气泡随着液流流进泵进口，使泵提前发生汽蚀。泵汽蚀大于5m的话这种现象会消失，开闭式的结果才基本一样。

Reply #62018-09-19

刚问过了，闭式台使用抽真空的方式做汽蚀余量试验，相比开式台的开关阀方式比较是精确得多，但是真空泵有时不太给力，真空度不够大，汽蚀余量太小时，做不了;P

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