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7/25/2019 Előre Hajló Lapátú Ventilátor Számítása
http://slidepdf.com/reader/full/elore-hajlo-lapatu-ventilator-szamitasa 1/1
Előre hajló lapátú ventillátor számítása
Lapát alak: Grúber: Ventill torok, 144. ábra
≔ D1 ⋅0.2 m ≔ D2 ⋅0.30 m ≔ ρ ⋅ ――9.80665
8 ―kg
m3
≔kszi 2.2≔b2 ⋅0.1 m ≔n ⋅2800 ―
1
min
≔φ 0.25
≔Qk ⋅0.6 ―m
3
s≔C a ⋅20
m
s
----------------------------------------------------------------------
≔u =⋅⋅ D2 π n 43.982 m
s
≔δp =⋅⋅ ρ
2u
2
kszi 2.608 kPa
≔ A =⋅ D2
2 π
40.071 m
2
≔Q =⋅⋅ A u φ 0.777 ―m
3
s
≔C 2r = ――Q
⋅⋅ D2 π b2
8.247 m
s≔b2k = ―――
Qk
⋅⋅ D2 π C 2r
0.077 m
≔φk = ―Qk
⋅ A u0.193
≔ pd =⋅ ρ
2C a
2
245.166 Pa
≔δp s =−δp pd ⋅2.363 103
Pa≔C 2u = ―
δp
⋅ ρ u48.381
m
s
≔ β 2 =atan⎛
⎝ ――
C 2r
−C 2u u
⎞
⎠61.928 deg ≔α2 =atan
⎛
⎝ ―
C 2r
C 2u
⎞
⎠9.673 deg
≔C 2 = ――C 2r
sin α2
49.078 m
s≔C 1m = ――
Qk
⋅⋅ D1 π b2k
12.37 m
s(b1k=b2k)
≔u2 =⋅⋅ D1 π n
600.489
m
s≔ β 1 =atan
⎛
⎝ ―
C 1m
u2
⎞
⎠87.738 deg
≔w1 = ――C 1m
sin β 112.38
m
s≔ p sp =−δp ⋅−C 2
2
C 1m
2 ρ
21.226 kPa