, . , (3.22) .
|
Yf , (3.22), , , ,
Y b , - , .
b .
Kf a . ,
Kf a = 1,0. eb ³ 1
ea - ; n . ea = 1,5 8-; Kf a = 0,92; b - , .
(zS > 200) mn. (3.25)
|
/z , . y bm = b/n. , [s f ] / YF .
, , , .
(3.4) (3.5) (. 3.4) :
|
|
. 3.5.
R = Re 0,5 b (3.27)
Re R , ; , , (. 3.2), , , ; 2 , . ; h , .
(3.4) (3.6). b = 35o (. 3.5). , , ZH = 1,59. Z e , , . . Z e = 0,8.
|
|
|
, , :
, :
|
Kd = 99: Kd = 86.
de2 12289-76 ( ): 50; (56); 63; (71); 80; (90); 100; (112); 125; (140); 160; (180); 200; (225): 250; 280; 315; 355; 400; 450; 500; 560; 630; 710; 800; 900; 1000; 1120; 1250; 1400; 1600.
.
de2 2%.
12289-76: 1; (1,12); 1,25; (1,40); 1,60: (1,80); 2,00; (2,24); 2,50; (2,80); 3,15; (3,55); 4,00; (4,50); 5,00; (5.60): 6,30.
.
3%.
12289-76 y bRe = 0,285.
b £ 350 1,2 1,35: > 350 1,25 1,45 (. . 3.1).
.
.
|
z 1 18¸32.
z 2 = z 1 u. z 1 z 2
,
d2 = arctg . -
me .
. 3.11. -
|
F , , ; Ft ,
YF (. . 42), -
J F 0,85 -
,