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,,,
z1
z2
(1) u1 P1
(2) u2 P2
W
P1
P2 2
u12
2 u22 g z1 g z2 + + + W = + + + 1F2
Bernoulli
ha = Za + Pa / g - hfa hk = Zk + Pk / g + hfk
hfa, hfk : (Fanning)
h = hk ha = (Zk- Za) + (Pk Pa) / g + (hfk hfa)
h = W !!!!
(NPSH) -
NPSH = ( Pa Pu ) / g + Za hfa = ha Pu /g
: NPSH > 0 ha > Pu / g
Pu = Pa NPSH = Za - hfa
NPSH
Za
Pa hfa F = = 2 f
(- Pf) g u2 l g d
h
I = G W g
(h)
()0 :
n = I / I0
,
-
(jet injectors)