已知风机风量12400m대/h,管道直径430mm,管道长86米,风速25m/s,求风机风压是多少?

2024-12-12 20:49:52
推荐回答(1个)
回答1:

1、计算风速(m/s):
V=12400/{(0.43/2)^2×3.14×3600}
=23.73
2、计算管道沿程摩擦阻力(Pa):
2.1、Re=(D*ν/0.0000151)
=(0.43*23.73/0.0000151)
=675754.9
2.2、λ=0.35/Re^0.25
=0.35/67574.9^0.25
=0.012
2.3、R=[(λ/D)*(ν^2*γ/2)]*86
=(0.012/0.43)*(23.73^2*1.2/2)×86
=790.73Pa
3、计算风机风压(Pa):
P≥790.7×1.2
≥948.8