弯头类型半径 R/b
宽高比 a/b 高宽比a/b角度待选参数ξ0 缓弯头0.8R/b>2 Ka/b 190参考值
0.48110.48
转弯半径R/b
0.60.70.80.9123ξ0 缓弯头
10.680.480.360.280.20.15ξ0 焊接弯头
10.870.80.740.70.340.23角度0306090120150180Ka
00.450.751 1.9 2.63烟道高宽比a/b
0.40.60.8123481.22 1.14 1.0710.860.850.911.55 1.35 1.15
10.450.40.430.6
风管局部阻力计算 ξ =ξ0*Ka*Ka/b
应用参数列表R/b<2 Ka/b R/b>2 Ka/b
局部阻力