c =0.54D
0.4
30(m 3
/s )时:
εm(2g)1/2H 03/2
εm(2g)1/2H 0
3/2
j =1.9h c "
-
取
q =Q max
25(m 3
k =L d +0
d
=4.3D 0
=q 2
/
=h c "-
c "=1.66D
Q min