7.1. , () :
n >4QC /d3,
QC - , 3/:
QC = KVj/60.
(v=pdn) ( 3 ).
3 -
D/d = 3 - 4; h/d =0,2; h/d = 0,4 - 1,0; l/d =0,25; b/d = 0,1; z = 8,4 | , , , ; v=2,5 - 10 / 10 *, |
: D/d = 3 d = 2400/4 = 600 (). d =630
n >4QC /d3 = (4. 0,152)/0,633 = 1,53
nc=2,08(c-1)
[n] 6 .
7.2. 2.
, : h=0,2d = 0,2.630 = 126 (), L=0,25d = 0,25.630 = 157,5 (), h=0,25d = 0,25.630 = 157,5 (), D=6d. .
do = 2-5 , [4].
do = 4
7.3. ( ):
,
v=25 / - ().
7.4. ( ) d. d. ( 7 ).
7 - ( 8732-78)
, | , |
73; 76; 83 | 3,5 - 18 |
= 11 () d. = 73 ()
7.5. :
,
r r - , /3.
7.6. :
7.7. . 20/ 25 4-7 . , . vo 40 /.
n1= =
D=6d. = 6. 0,073 =0,438
n= n0/ n1 = 513/55 = 9,33
n = 9,33< = = 10,6
7.8. ( ):
y= n,
=0,0094 n=0,62 <18; C=0,026 n=0,26 >18.
s - ( s = 0,07 /).
y= n = 0,026. 35,90,26=0,066
|
|
y , :
r-=r(1-y)+r y = 1000.(1-0,066)+1,29.0,066 = 934,1 (/3);
V-=V/(1-y) = 14/(1-0,066) =15 (3);
-=/(1-y) = 3,3/(1-0,066) = 3,53 ().
7.9. :
,
- ; =(H/D)0,5=(3,3/2,4)0,5 = 1,173;
i - , : i =1,1-1,2 - , , ; =1,25
N - , :
N=KN r n3d5,
N - , ( 1 ) - KN=f(Re).
Re - :
.
N = 4
, :
,
- , ( 5 )
5 -
0,23 | - 0,54 |
N - , ; :
N = 6020 d1,3 ,
d=0,117d - ,
d = 0,117. 0,63 = 0,074 ()
N = 6020.0,0741,3 = 202,9 ()
h - ... ; h =0,85-0,9.
7.10. 6 -.
N, | , -1 |
2,08 | |
7,5 | + |
. + -,