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["mosh

2018-04-27View Original

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éPSH est ce qu'il reste de pression après la cavitation pour éviter
Reply #22018-04-27
e que le pompe ne cavit
Reply #32018-05-07
e.
Reply #42018-05-08
2Le dernier post a été modifié par 泡沫_ZPTK 于 2 2 2
Reply #52018-05-10
4-
Reply #62018-05-15
K
Reply #72018-05-17
个人认为气蚀余量其实就是机泵运转时泵前系统把介质送到泵入口且保证介质不汽化所需要的最小液面高度(液面为常压情形)……
Reply #82018-05-23
首先要分清楚有效其实余量(NPSH)a,临界汽蚀余量(NPSH)c,必须汽蚀余量(NPSH)r的概念。然后要知道泵输送液体实际上就是大气把液体压上来的,我们知道大气压强1atm=10.33米水柱。所谓的泵进口压力就是大气压强-吸程高度的液体压强。比如:(NPSH)r=2m,考虑到液体的饱和蒸汽压问题,管路压头损失问题,那么该泵的安装高度甚至都不能超过8米。超过8米就会发生汽蚀了。

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