, HB ≤ 350 , d 2 [14]:
Kd , : Kd = 99 , Kd = 86 [14];
K β , , (. 6.3) Kb × U / (2 Kb); Kb b Re; Kb = 0,20,3;
; ψ bRe = 0,285 ( 12.28976).
K β = 1,2 (. 6.3):
1228976 d 2 = 225 . 1228976 bw = 34 . : bw ≤ 0,3 Re, bw ≤ 10 me.
[14], z 1 = 1832. z 1 = 19, z 2 = u × z 1 = 3,15 × 19 = 59,85; z 2 = 60.
u = z 2 / z 1 = 60 / 19 = 3,158.
Δ u = (u u) / u 100 % = (3,158 3,15) / 3,15 100 % = 0,25 %,
.
me = de 2 / z 2 = 225 / 60 = 3,75 .
de 1 = d 2 / u = 225 / 3,158 = 71,25 .
[14]:
tgδ2 = u = 3,158; δ2 = arctg 3,158 = 72,429 = 7225'45'';
δ1 = 90 δ2; δ1 = 90 7225'45'' = 17,57= 1734'15''.
R = Re 0,5 × b = 118,014 0,5 × 34 = 101,014 .
:
m = m e R / Re = 3,75 101,014 / 118,014 = 3,21 .
:
d 1 = d 1 b sinδ1 = m z 1 = 3,21 19 = 60,99 ;
d 2 = m z 2 = 3,21 60 = 192,6 .
β m = 0, ;
x 2 = x 1 = 0,412.
x τ1 = 0,03 + 0,008 (u 2,5) = 0,03 + 0,008 (3,158 2,5) = 0,035;
x τ2 = x τ1 = 0,035.
h a e 1 = (1 + x 1) me = (1 + 0,412) 3,75 = 5,295 ;
h a e 2 = (1 + x 2) me = (1 0,412) 3,75 = 2,205 .
h fe 1 = h a e 2 + 0,2 me = 2,205 + 0,2 3,75 = 2,955 ;
|
|
h fe 2 = h a e 1 + 0,2 me = 5,295 + 0,2 3,75 = 6,045 .
he 1 = h a e 1 + h fe 1 = 5,295 + 2,955 = 8,25 ;
he 2 = h a e 2 + h fe 2 = 2,205 + 6,045 = 8,25 .
Se 1 = (0,5π + 2 x 1tgα + x τ1) me =
= (0,5π + 20,412tg20 + 0,035) 3,75 = 7,14 ;
Se 2 = π me Se 1 = π3,75 7,14 = 4,64 .
θ f 1 = arctg(hfe 1 / Re) = arctg(2,955 / 118,014) = 1,4344 = 126'4'';
θ f 2 = arctg(hfe 2 / Re) = arctg(6,045 / 118,014) = 2,9323= 255'56''.
θ a 1 = θ f 2 = 255'56''; θ a 2 = θ f 1 = 126'4''.
δ 1 = δ1 + θ a 1 = 1734'15'' + 255'56'' = 2030'11'';
δ 2 = δ2 + θ a 2 = 7225'45'' + 126'4'' = 7351'49''.
δ f 1 = δ1 θ f 1 = 1734'15'' 126'4'' = 168'11'';
δ f 2 = δ2 θ f 2 = 7225΄45'' 255'56'' = 6929'49''.
dae 1 = d 1 + 2 ha e 1 cos δ1 = 71,25 + 2 5,295 cos 1734'15'' = 81,346 ;
dae 2 = d 2 + 2 h a e 2 cos δ2 = 225 + 2 2,205 cos 7225'45'' = 226,33 .
:
ψ bRe = bw / Re = 34 / 118,014 = 0,288 < 0,3;
ψ bd = bw / d 1 = 34 / 60,99 = 0,557.
.
.
υ = π d 1 n 1 / 60 = 3,14 60,99 103 949 / 60 = 3,03 /.
8- (. 5.6).
:
:
Ft 1 = Ft 2 = 2 2 / dwm 2 = 2 113230 / 192,825 = 1174,43 ;
dwm 2 = 0,857 d 2 = 0,857 225 = 192,825 ;
, :
Fr 1 = F 2 = Ft tg α cos δ1 =
= 1174,43 tg 20 cos 1734'15'' = 407,565 ;
, :
F 1 = Fr 2 = Ft tg α sin δ1 =
= 1174,43 tg 20 sin 1734'15'' = 129,053 ,
dwm ;
α ;
δ .
(. 6.2).
. 6.2.
.