[". Se refifica la la fóDulaulaulaa de conula conla fófDD速的计算公式与与与D与与压压压压压压压压压压压差D与压差力D的关系，而是D与压压压D压压压D压压D压压D压压D压压D压D压压压D与压压压DD压压压D压压D压D压压D压D压D压D压D压D压D压DDDD DDDDDD单位是什么D这样计算的的的依据D可以分享D下谢谢D

2019-07-23View Original

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D. DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD

Reply #22019-07-23

跟压力没有直接关系，而是跟压差有关。水平直管流速可以直接用根号下2△P/ρ来求。

Reply #32019-07-23

有流量的话直接流量除以截面积就出来流速了，不知道的话要知道管道前后压差P，管长为L，管道比阻为S（可由管内径D及内壁糙率n查表得到），则流量 Q = ^(1/2)，粗算出流量

Reply #42019-07-25

这个公式太复杂，出题者理解不了。也不适合管路中有限流器件

Reply #52019-07-25

我靠，我怎么看着这个是根据动压算流速的？

Reply #62019-07-25

这个貌似比较靠谱，但是比较复杂，而且有误差

Reply #72019-07-25

谢谢，不过确认有点难理解

Reply #82021-02-22

单位是什么？这样计算的依据可以分享下吗，谢谢

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