ξ=0.4+0.262×2+0.1179×2+0.03=1.3798局部压力损失:∆Pj,9-10=ξV9-102ρ2=1.3798×9.0482×1.22≈67.770Pa管段9-10的阻力∆P9-10=∆Pm,9-10+∆Pj,9-10=39.546+67.770=107.316Pa9)管段10-11摩擦阻力∆Pm,10-11=∆pm,10-11l10-11=0.8589×6.413≈5.508Pa局部阻力2个90°弯头r/W=1HW=6001200≈0.5查附录1查得ξ=0.25变径F0F1=1.75×用插值法查附录1求得ξ=0.0042ξ=0.25×2+0.0042=0.5042局部压力损失:∆Pj,10-11=ξV10-112ρ2=0.5042×8.7962×1.22≈23.407Pa管段10-11的阻力∆P10-11=∆Pm,10-11+∆Pj,10-11=5.508+23.407=28.916Pa10)管段11-12摩擦阻力∆Pm,11-12=∆pm,11-12l11-12=1.1633×1.905≈2.216Pa局部阻力T形分流三通LSLC=00≈0.91查附录1用插值法算得ξ=0.0135图4.5矩形风管T形分流三通ξ=0.0135局部压力损失:∆Pj,11-12=ξV11-122ρ2=0.0135×9.0482×1.22≈0.663Pa管段11-12的阻力∆P11-12=∆Pm,11-12+∆Pj,11-12=2.216+0.663=2.879Pa11)管段12-13摩擦阻力∆Pm,12-13=∆pm,12-13l12-13=0.9839×9.737≈9.580Pa局部阻力T形分流三通LSLC=00≈0.91查附录1用插值法算得ξ=0.013590°弯头r/W=1HW=4001750≈0.23查附录1取ξ=0.27ξ=0.27+0.0135=0.2835
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