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1、smRP41lv22mPvlsRsRPFFPsmRR4122vsRPF442DDDDDPm1lv22DRm22v)Re51.271D.3K(2lg1KReRevDmBtmRRmRtBmRtB0.82527320273t0.9101.3BtBtB0.010.100mmRR mkmRRkk0.25KvvmRtBmRtBmR4DRs)(baabPFRs 2ba、ssRR 42Dabab()2vabDDabvDL2424LvD 2242mLLDRD()vabL Lvab 22142)()(abLbaabRm mmRR3351.265La bDabv625.05.0360027003600FLvDbaa
2、b233.025.05.025.05.02vvDmRtmRtmRLD533baba384.025.05.025.05.0533LDmRmRtmR22jvPjP图图6.3 圆形风管弯头圆形风管弯头图图6.5 矩形风管弯头矩形风管弯头图图6.4 导流叶片导流叶片图图6.6 几种矩形弯几种矩形弯头的局部阻力系数头的局部阻力系数图图6.7 渐扩管内的空气流动渐扩管内的空气流动图图6.8 风机进出口的管道连接风机进出口的管道连接1v2v3v图图6.9 三通支管和干管的连接三通支管和干管的连接图图6.10 风管进口风管进口mjPPP P表表6.2 工业管道中常用的空气流速(工业管道中常用的空气流速(m/s
3、)表表 6.3 空调系统中的空气流速(空调系统中的空气流速(m/s)0.225PDDP()DDPPLKLLffpPKPfLLfPPLKLKpKpKffLL 2.1ffPPvvLvDvmRBmRmPlRmvmR43.0210090032LL51.0280200232)(FF038.022.0421)(F031.02.0422)(F062.028.0423)(F1F2F3FjP22v292.12LlDvmRtmRmPjPP流量管段长度管径流速比摩阻比摩阻修正系数实际比摩阻局部阻力系数沿程损失局部损失管段总损失%9.67%1002.1091.352.109%100161PPP%151552.1091
4、.35200225.0225.0)()(PPDDDDvmRmRBmR1F2F3F1F2F3F03.0P%1.02.1091.1092.109161PPP%15%4.243.1757.1323.17521721PPPP)(%157D%157D%9.73.2478.2273.2473218321)()(PPPPPPP%1551)(jmPPPLfKLL1.15 379436fpPK PfLfP图图6.16 止回阀止回阀330068002420600025001880142810001072300025001050110430009003201720355068002500104043001003203756803500350024353201003000106530001040500550190