风管管件局部阻力系数表
1015202530451.250.010.020.030.040.050.061.500.020.030.050.080.110.131.750.030.050.070.110.150.202.000.040.060.100.150.210.272.250.050.080.130.190.270.342.500.060.100.150.230.320.40A 1/A 00.00.10.20.30.40.50.60.70.80.9 1.0ξ0.500.470.420.380.340.300.250.200.150.090.00A 0/A 10.00.10.20.30.40.50.60.70.80.9 1.0ξ
1.000.81
0.640.490.360.250.16
0.09
0.04
0.01
0.00
0.220.270.310.360.400.310.390.450.510.570.430.530.610.700.770.560.690.800.91 1.010.10.20.30.40.50.8 1.3 1.4 1.4 1.4-1.40.9 1.3 1.4 1.4-9.50.20.9 1.2 1.3-21.2
-2.5
0.3 1.0
1.2
0.300.200.300.400.1-0.1-0.8-2.60.10.20.01-0.60.20.30.30.20.20.30.40.410203040901201500.14
0.07
0.04
0.05
0.11
0.20
0.30
序号名称110.00A 1/A 0\α
减缩管
ξ00.1图形
15.003局部阻力系数ξ
A 1/A 0α
2
突然收缩与突
然扩大
20.0025.0030.00L 2/L 0圆形渐扩管
1.251.501.750.6
2.00A 2/A 1L 2/L 0
ξ10.10.20.40.6
圆形
5伞形罩A 2/A 1侧孔吸风
4α
0.20.4
0.250.130.100.120.190.270.37
0.250.400.500.500.500.500.130.200.250.290.330.350.100.160.200.230.260.280.080.130.170.200.230.250.080.110.150.170.190.210.050.090.120.150.150.170.03
0.06
0.07
0.09
0.10
0.11
0.250.500.80 1.00 1.25 1.50 1.75 2.00 2.50 3.00 3.501.80
1.50
1.17
1.000.80
0.70
0.57
0.48
0.40
0.37
0.33
1.50
2.00 2.50
3.00 3.50
4.000.080.090.100.100.110.110.100.110.120.130.110.150.120.140.150.160.170.180.150.180.210.230.250.260.180.250.300.330.350.350.21
0.310.38
0.410.43
0.44
ξA ξB ξA ξB ξA ξB ξA ξB ξA ξB 0.800.350.750.300.650.300.600.350.550.400.550.250.450.200.400.180.400.250.400.300.350.200.300.160.220.150.220.220.250.300.300.150.200.150.200.130.200.200.250.300.150.120.130.080.130.120.150.150.200.250.100.100.100.050.100.100.13
0.10
0.15
0.25
0.60
0.80 1.00 1.20 1.40 1.600000001.000.400.200.100.050.000.60
0.80 1.00 1.20 1.40 1.600.40
0.35
0.20
0.10
0.00
0.00
矩形1.502.001201501800.75r/d\α3060906
ξ=ξ'A (ξ'-圆、方弯管的ξ值，见上表）
a/b A 3.006.00
圆（方） 弯
管
1.001.257
α
通风机出口变
径管
8
25.0030.0035.00A 0/A 1
10.0015.0020.00矩形弯管
90
120
0.050.10Vd\ξ\α
3045609
V 2/V 1
100.200.300.601.00干管ξ1
支管ξ2
压出四通
吸入四通喇叭形 吸
气口
11V 2/V 1
干管ξ
1
-1.80-0.700.000.100.250.35
0.200.400.600.80 1.00 1.20 1.40 1.60 1.80 2.000.200.40 2.10 3.70 5.20 6.607.809.0011.0011.0012.000.30-0.210.54 1.20 1.80 2.30 2.70 3.10 3.70 3.70 4.000.40-0.330.210.620.96 1.20 1.50 1.70 2.00 2.00 2.100.50-0.380.050.370.600.790.93 1.10 1.20 1.20 1.300.60-0.41-0.020.230.420.550.660.730.800.850.880.80-0.44-0.100.110.240.330.390.430.460.470.481.00
-0.46
-0.140.05
0.16
0.23
0.27
0.29
0.30
0.30
0.29
0.40.60.81.020.040.060.090.0120.020.040.060.090.0120.0
A 2/A 3L 2/L 1
干管ξ1
支管ξ
2
吸气三通
129.61风管入口（装设孔板）
13
3.081.170.48A1/A2
风管入口（装设矩形排风罩）
15
0.20θ
风管入口（装设圆形排
风罩）
0.020.030.050.110.10
14
θ
0.130.080.120.190.27
18
矩形断面直角弯头（一片大型叶片）
0.56
0.35
矩形断面直角弯头（小型机翼型叶片）
16
矩形断面直角弯头（小型叶
片）
17