风管管件局部阻力系数表

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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

1.00

0.810.640.490.360.250.16

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

4

α

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

1.00

0.80

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

0.31

0.38

0.41

0.43

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

0.600.80 1.00 1.20 1.40 1.600000001.000.400.200.100.050.000.600.80 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

1.001.257

α0

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

3045

60

9

V 2/V 1

10

0.200.300.601.00干管ξ1支管ξ2压出四通

吸入四通

喇叭形 吸

气口

11

V 2/V 1

干管ξ1

-1.80

-0.70

0.00

0.10

0.25

0.35

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

0.230.27

0.290.300.300.29

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ξ2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

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