风量长度流速直径宽度高度方当量直径圆l(m)φabv(m/s)225902001500630887.320.003639200500320390.240.0022590200500.000.0022590200000.000.000.50.7511.52340.270.250.230.210.190.180.180.1923468101421.771.641.561.461.381.31.15Re扩散角度1620304560901200.140.190.320.330.330.320.310.23-0.310.30-0.380.45-0.60.61-0.840.68-0.880.64-0.880.63-0.880.070.120.230.270.270.270.270.15-0.210.18-0.280.36-0.520.55-0.760.59-0.870.59-0.870.57-0.870.050.070.120.270.270.270.270.17-0.210.24-0.340.38-0.560.51-0.720.56-0.790.58-0.850.58-0.87大小管面积比扩散角度16203045609020.180.220.250.290.310.3240.350.430.50.560.610.6360.420.470.580.680.720.760.420.490.590.70.80.87大小管面积比扩散角度14203045609020.090.120.20.340.370.3840.160.250.420.60.680.7系统编号管段编号风管尺寸(mm)L(m3/h)de局部阻力系数ζ曲率半径为1（r＝b）的矩形风管90度弯头ζ（Re≥20×104）(45度弯头修正系数为0.6a/b＝0.25Re＜20×104时ζ。的修正系数Re＝1×104圆风管扩散管ζ(上行：大小管面积比为2；下行：大小管面积比为4－0.5×1052×105≥6×105矩形风管4面扩散管ζ≥10矩形风管2面扩散管ζ60.190.30.480.650.760.83圆形风管和矩形风管的渐缩管大小管面积比扩散角度1015—4050—609012015020.050.050.060.120.180.2440.050.040.070.170.270.3560.050.040.070.180.280.36100.050.050.080.190.290.37使用说明：四、局部阻力系数根据上表和管件数量填入近似值一、若计算方风管，将圆风管的直径填为0；若计算圆风管，将方风管宽度、高度填为0。二、计算摩擦阻力系数λ时使用单变量求解法，具体方法如下：1、在菜单栏的“工具”中选择“单变量求解”，屏幕上会出现一个对话框。2、将对话框中的“目标单元格”定为表格右端“λ计算”下所对应风管的表格。3、将对话框中的“目标值”定为0。4、将对话框中的“可变单元格”定为相应风管阻力系数λ。5、点“确定”按钮，摩擦阻力系数λ即可算出。三、计算混凝土风道时，替换表格右端的“λ计算”中的公式风道阻力计算表流速雷诺数阻力系数比摩阻沿程阻力方圆方圆方圆方圆v(m/s)ReReλλ6.640.003.91E+050.020.0160.000.460.006.320.001.64E+050.020.020.001.140.000.000.000.00E+000.020.020.000.000.000.000.000.00E+000.020.020.000.000.00局部阻力名称ζ568进风口0.50.20.270.27出风口10.370.2310.2...
