风管计算局部阻力系数

1、风管计算局部阻力系数风管计算局部阻力系数B.3.2局部阻力系数管件”进风口的局部阻力系数/II安装在境上的风管1 *即I/O00,0020.VI0.05o.i0.?1.0伉500-57山饋16800.盟Utt,Q0.020-310.520砧0.660.720-72Q. 05OLSOO.SO乩50.5QOp 500*5C当风世为矩形时*。为流速当直径当这种管件的入口处装有两格时.应进行修正。边璽较薄时,即c5/Z).O5时 $0 = 1 + 乱边壁较厚时，即0. 05H.瓷a = d品式中管件的局部阻力系数，见上表；乳購格的局艇力系数.见管件G-乩八2不安在端增上的椎形渐缩喇叭口当断面处有网格时

2、按式（8.32）进行修正。A-3安装在端壇上的锥形渐缩喇叭口D010203040601001401800.0250.500.470.450.43D.410.400.420.450.500050.500.450.410.36D.330.300.350.420.500-0750.500.420.350.30260.230.300.400.500.100.500.390.320.25X220.180.270.380.500.150.500.370.270.200.160.150.2S0.370.50 |0.600.500.270.180.13XII0.120.230.360.50当断面处有网格时，应

3、按式（8.3-2）修正。 八4罩形进风口C0.)0.20.30.4O.S0.60.70.80.902.5L81.5L41.31.21.21.1l.lIS1.30.770.600.480.410.300-290 280.25I/D若断面处有网格时应按式（8.3-2）进行修正。 *5带成不带凸边的渐缩型罩子。/$对于矩形罩子.0系指大角。 管件8 岀风口的局部阻力系数B-1直管出风口= 1.0当出口断面处有网格时，应按式（8.32） 进行修正。B-2锥形出风口，圆风管577儿/ *。on141620：40.240.20.36ILS1U.JMl.u ；1.060220.25U.320.49U糾).9

4、8l.u10019九23U.M0.500.910.72 :Q3-2梓X无(6017.10.2U1).270.J90.91l.oLl当断帀处有网格时.应按式（83 2）修正亠3-3矩形平面扩散出风口当断面处有网格时应按式（氏3 2）修止二B 1矩形锥形扩散出风口 （慕堪或不靠墙）87j. /y如10 11203013川.2V.440.58u. 70n.86L4(J.310.J80.610.76o.wl.i6U.290. 17U620.71J-W :l.lU260.450.60U.73D.89 :- i当断面处有网格时.应按式（832）修正B 5逋过90弯头排至人气的出风口78当出口处有网格时.应

5、按式（乩32）进行修正。B6不接风管.风机岀口为不对称的扩敵出风口B- 6A 10WA1.52.02.53.0j3.54.Ui10).510.340.250-216.180.1715z0.360.270.240.220. 20 200.550.380.31i). 270.250.2J :250.590430.370.350.530-J3 300.630.500.460.440.130.42 i严0.560.530.5210.510. -Hl 1当断面处有网格时.应枝式（8.3-2）修正。B 7不接风管.风机出口为锥形扩散B7如v 1AjAu自由推出j A 1.52.0 I 2.5303.5 1

6、 4.U 100.540.420.370.3,0.32 h：n150.670.580.530.510.5(1 051 i-L1200.750.67(L650.641 U.61 0.65 :j25O.WU.7I0.720.70(J. 700.720.850.780.760.75Ou 5 ： 0.76 :当断面处有网格时.应按式（8.3-2）修正。B 8排气罩当断面处有网格时，应按式（&3-2）修正o 管件C弯头的局部阻力系数C-190圆形弯头上喪为9CT弯头时的局部阻力系数.当弯头不是90时.则要乘上修正系数“ 其值579见表8. 3-10C-23.4. 5节90圆弯头1节数1r/D0.50.7

7、5U01.52u13 0.460.330.240.1940?70.24111 30.980.540.420.H0.331C-3矩形风管不带导叶的弧形弯头0.250.50.7SLO1-52.03.04.05.06.08.0 i0.51.5l41.3门1.01.0Elin1.211.20.7S0.570.520Z80.44ONO0.390.390.400.420-430.44 |1.00.270.250- 230.210.190.180.180.10.200.270.21 j1.50.220.200.1920 0.51.101.261.191.4l.W1.06l.(M1 1.6 : 1.0 10.

8、752-l.M1.561.46L381. isl i.i) 氐为雷诺数Re20 x 104时的局部阻力系数.当Re 一个导流叶片580（D一idoA）二 RCR或中 R头的内半绘，m,心一导流叶片的弯曲半径，m； CR曲的比值，见下表、坯见表8. 3-lo出bribCRa/b0.250.51.0b52.03.04.0S.O6.07.08.00.050.550.2180.520.400.430.490.550.660.750.840.931.01.10.100.600.3020.360.270.250.280.300.350.390.420.460.490.520.150.660.3610.28

9、0.210.18UW0.200.220.250.260.280.300.320.200.700.4080.220.160.140.140.150.260.170.180.190.200.210.250.750.4470.180.130.110.110.110.120.130.140.140.150.150.300.800.4800.150.1!0.090.090.090.090.100.100.110.1!0.120.350.850.5090 130.090.080.070.070.080.080.080.080.090.090.400.900.5350.110.080.070.060.060

10、.060.06O.OT0-070.070-070.4S .0.950.5570.100.-070.060.06O.OS.0.050.050.050.050.060.060.501.000.5770.090.060.050.050.040.040.040.050.050.050.052号片片（2）两个导流叶片= C.乩二 R/CRRiRx/CR = RKCR2式中 Ri2号导淤叶片的弯曲半径，m, 其他符号说明同一个导流叶片。R/bMbCRa/b0.2SO.5l.D1.52.03.04.05.06.07.08.0U.050.550.3620.260.200.220 250.280.330.370

11、.410.450.480.51G100.6C0.4500.170.13O.U0.120.130. 549U.U7UU5lb 060.060.U60.070.U7u.g0.U8O.M2 :0.150.850.601v.v50.D40.040.04o.uOJH0.040.U40.04UU50al60.2U0.700.6390.03O.U3O.i30.030.030.U30.030.03V.03h U3oaa 0.250.75U.WiH0.030.020.020.020.020.1)20. U20.02U.02L020.02 i0,300.693U.Uluan *0.350.85U.7140.020

12、.02(Ml0.01ih)l0.010.010叫D.tHOIHm u.0.40.900 7310.02O.dl(01O.OIIMI0.010UI0.G10.010.01hvl .0.450.95 (K7I60.010.01V-Ol0.01n.oi0U|ihOlO.UIa. i)iu.u】01. (KU 0.76tiiD.010.010.010.1H0.)1U.0IUQ11o.m0.V10.U1- 4諭注r55B)152L30.33D290.260.23导叶轨心入32.U2. IS0詔0.310.270.24孚叶轨宪岀43.25% 260.21 U.1H1U】6牙叶轨突出管件D渐扩变徃管的局部阻

13、力系数D-1圆风管锥形扩散管582o =】80D2矩形現管金字塔型扩散管。-3矩形风管平面扩散管Q-31g0iReA i / Aq1620304560901201802n.id0.190.320.330.330.320.3110.3040.230.300.450.610.680.640.630.62 !0.5 * 10s60.27).330.4B0.660.770.740.730.72j100.29De 380.590.760.800.830.840.83 1160.31LS80.60Q.MO.M0.880.880.88 ；20.070.120.230.2*0.Z7Q.Z70.270.26)4

14、OUS0.180.360.550.590.590.570.57 j2 x6U190.28Q.U0-900.700.710.710.69 |1100.20.240U30-76OeSO0.81o.siU.81160.210.280.520.760.870.870.870.87 *20.050.070.120.270.270.270.270.27：40.170.240.380.510.560.580&0.57!6 x IO56Oel60.290.460.600.690.710.700.70；100-21(330.52O.fiO0.760.83O-MO.3l160.21(3$0.560.720.790

15、-850LOU.4ZOU90. 590.70U.80U.870-850.86 !九10Cy14203045609018020.090.120.200.340.370.380.3540.160.250.420.600.680.700.66 60.190.300.480.650.760830.80583D-4天圆地方按下述方法求出当量角&，然后由管件。-2的表中 査出&值。(1 )从圆形变舷矩形_tan(/2) = (1. 13- g ) /2/(2从矩形变到圆形tan(/2) =- 1.13o-6o)/2/风机出口接风管的平面对称扩散管do0(0)“1 “0ho2.02.53.03.54.010

16、0050.070.09ouo0U10.11 ；150.060.09oai0.130.130.14200.070.100H30.150.160.16250.080.130U60.190.210.23300.160.240.290.320.340.35350-240.340.390.440.480.50i0-6风机出口接风管的平面不对称扩散管P-60(0)01.52.02.530L-354.0100.00.090.100.10O.ll0.1115010oai0.120.130.14045200.120J40U50.160.170.18250. ISnu80.210.230.259.26300.19

17、u250.300.330.350.35350.210.310.58out0.430.44管件E渐缩变径管的局冊阻力系数E-1 圆形风管和矩形风管的渐缩管:151015-4050-609012015018020.050.050.060.120.180.240.2640.050.040.()70.170.270.350.41:! 60.050.040.070.180280360.420.050.050.080.190.290.370.43-2圆形风管和矩形风管的锥形渐缩管“ =584刎）-2UD01020304060100140100.0250.500.470.450.430U10.400.420

18、.450.500. 050.500450.410.360.330.300.350U20.500.0750.500.420.350.300260.230.300.400.500.100.500.390.320.250.220U80.270.380.500.150.500.370.270.200.160】50.250.370.500.600.500.270 180.13o.n0.120.230.380.5000.20.40.60.80.9UO1.00850.680.500.300.180管件F三通的局部阻力系数F-1圆形风管Y形合流三通支通itXM0.10.20.30.40.60.81.00.4-

19、0.56-0.44-0.35-0.28-0.150040.050.5-0.48-0.37-0.2-0.21-0.090.020110.6-0.38-0.27-0.19-01200.100.180.77.26-0-16-0.08-02l-0.020.050.120.230.320. 400.90.040.130.210.270.370.460.531.00.220.310.380.440.530.620.691.51.41.SL51.6155-0.21-0.050.05O.S-2.3-0.95-051-0.28-0.060.060.130.6-13050*0.Z2-0.090.050.120.1

20、70.7-0.63-0】8-0.030.040.120.160.180.8-0.180.010.07oao0.130.150.170.90.030.070.080.090.100.110.13UO-0.0100(MO0.020.040.05585P-2 圆风管锥形合流三通1.0187010.1仇93816r20用58Z1142626】60.500.40051-0.2).-0.33 .0.21230D0.44-0.10024039H0.46014160.29支通道V0.730. 430500.05002-0.38-0.41).80460.940.060.520.670.750.770.780.2

21、?-0.721.50.25-0.24-0.62 -0.691.80.35 -0.050.27-0.3-0.34-007421805U207.42“47(M4228181250424.24.75即2.12.32.5U51.6U?9.611123.74.14. S1.61.82.00.991.11.20.660.751011123.63.91.8192.10.760.830.曲0.56V.61I). 650. 440.479.501!11123.7372U2.U2.LU21.21.30.800.85iKW0.460.47九480.300.3(叽290.850.570.68D.39a586主通jK

22、5AiY)L/LiAi4|U.20.40.60.8hO1.21.41.61.82.00.30.25.3-C.012.0hi034-0.20-0.61-0.93-12-1.40.35.43.72.516LO0.530.16-0.14-0.38-0.580.40-21.9KI0.46-0.070.49-0.83-LI-1.31.5-1.70.32.01.40.810.420.08-0.20-0.43-0.62O.78-0.S20*42.0!.S1.00.680.390.160040.21-0.35-0.470.50.20.770.34-0.09-0.48-0.81-1.11.3-L5】7-1.80

23、.30.850-560.25-0.03-0.27-0.487刃-0.82-0.96-1.10.40.880.660.430.210.02-0 IS-0.30-0. 42-Or 54o.w I0.5U910.730.540.360.210.060.06-0.170.26o葯:0.B0.20.300-0.67-0.961.2-14-1.6-1.8 1.9 j0.30.370.21-0.02-0.240. 44-0.63-0.79-D.93-1J1.2 ；O.d0.400.310.16-ul-0.16-0.30-0 13-0.54064-0.7310.5(J.430.370.260.140.02-0

24、.09-o.?o-0.290.370.45110.60.4404l0.330.240.140.05-0.03-oai-0.180.250.80.2-006-0.27-0.57-O.M-1.11.4】61.7-2.00.30-o.o0.25-0.430.62-0.787.93-LI-1.2130.40.040.02-ouw-0.21-0.34-O 46-0.57-0.67-0.77-0.85 i10.50.060.080.020U60.16-0.25-U34-0.42-O.iO057 0.60.070.120.090.03-0.04-0.11-0. (R0.250.31 U 37 0-70.08

25、0.150.140.100.05-o.oi 0.07 -0.12-0.17O22 :i0.80. U9D.170.180.16U-ll0.070.02-0.02-0.07i) 190.350.54-0.7!-0.87-1.0-i.2-1.31.40.4-0.10-0.19-0.31-0 43-0.55-0.H6-0.77086-0.940.5-0.07-O.(M-0.09-oa?-D.26035-0.44-0520.590.66060.06o-0.02-0-07-0.14-0.21-0.280.34040U；6 .0.8-D.040060-070050.020.03-0.07-0.12-0.1

26、60.20 :1.0-0.030.090.130.130.110.080O60.03-0.01003 F-3 矩形风管Y形合流三通支A道2 *石AtLy/L,6.10.20.3Ud0.50.60.70.80.9f3少fw0250.250.5000.50-1.22.23.75-88.40.330.257.2-0.400.401.63.04.86H0.50.67D.50.5-0.501.0-0.20-0.600-0.200.250.100.阴0.300.700-60l.o2u 12.01.00.5-2.2-i.5-0.95-0.5000.400-801.31.9ho1J)-0.60-0.338 1

27、2.01.0-2.1-iu-0.90-0.50U2000.200.25 _0.30 1587S 1 Jt, in山/儿Ayl AyMi0.10.20.30.4O.S0.60.70.80.90.760.250.300.300.20-0.1004S-0.92-1.5-2.0-2.61.00.50.170.160.100-0.08018-0.27-0.37-0.460.75050.270.350.3Z0.250.12-0.03-0.23-0.42-0.580.S0.51.21.10.9C0.650.550-0.400.8C-1.3L01.00.180.240.270.260.230.180.100-

28、0.120751.00.7S0.36OJW0.350.270.180.05-0.080220.51.0o.ao0.870.800.6O.SS0.400.250.08 0.10F-4 矩形风管45“接入的合流T形三通41)10.51.010.311支通il 5iLi/Lioa0.20.31 OU0.50.60.70.80.91.06O72-0.52-0.230.340.761.14l.32.012.903.63主 A A inL/.00.10.20.30.40.50.60.70.80.9hO00.160.270.380.46一 0.530.570.590.600.S90.55F-5F-5圖风管Y

29、形分流三通 支通道占、(18 = 30L9/Li0.10.20.30.40.50.60.7-0.8O.S0.80.750.550.400.280.210.160.150.160.190.70.720.510.360.260.)80.1S0.160.200.260.60.690.460.310.210.170.160.200.280.390.50.650.410.260.190.180.220.120.470.67OU0.590.330.210.200.270.400.620.921.303O.SS0.280.240.380. 761.32.0020. 400.260.581.32.50.10.

30、 281&S88(2)心 45*1/410U0.20.30.40.5(!.60.70.80.9480.780.620.490. 400.340.310.320.350.400.70.770.590.470.380.340.320350.410.500.60.740.560.440.370.350.3(0.430.540.690.50.710-520U10.380.400.450.590.781.00.40.660.470.400.430.540.690.951.3L70,30.660U80.520.731.21.82.7_ -0.20.560.561.01.80.10.602A(3) = 60AJAL/L0.10.20.30.40.50.60.70.90.90.80.830610.620.680.760.94121.SO.i0.760.650.650.740.89U11.41.82.30.30800.750.89110.20.30.40.500.70.80.90.80.950.920.920.930.940.96kl1.2