流体力学 沿程阻力实验报告.doc

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1、沿程阻力实验报告姓名：学号：学院：班级：一、实验任务及要求1）寻求摩擦阻力系数λ与雷诺数Re的函数关系，即λ=f(Re);2）了解实验设备与仪器。二、设备简图三、实验原理1）实验段两端到实际流体伯努力方程：因为：水平等截面管路，有：z1=z2,V1=V2实际流体伯努力方程简化为：则沿程阻力损失实际上就是两截面的压力差：2）摩擦阻力系数：3）速度：4）雷诺数：四、实验步骤1）分别用两种方法测量压力差1.用丁字尺测量两水银柱面高度差Δh.2.用压差变送器测量.2）用两种方法测量流量Q1.用三角堰测量流量Q.2.用涡轮流量计测量流量Q.3）用水银温度计测量水温。4）查表得到水的运动粘性系数。五、

2、数据处理实验记录表格及处理数据如下：表一测针零点读数h0=118.95mm,水温t=22.5℃水银比压计读数差Δh测针读数h堰上水头H流量运动粘滞系数mmmmmm测针计算(m3/s)电子测量(m3/s)电子测量(m3/h)ν(10^6)=μ/ρ(m2/s)228208.7789.820.0033908230.00331944411.950.947200206.2287.270.003157490.00308611111.110.947120196.9177.960.002388380.0023472228.450.94780189.8770.920.0018899150.001869444

3、6.730.94750183.2264.270.0014816140.0014666675.280.94730177.4258.470.0011728630.0011611114.180.94720171.9152.960.0009185420.0009138893.290.94710164.4845.530.0006325610.0006055562.180.947表二水头损失hf流速V阻力系数λ雷诺数Lg100λLgRemm测针计算（m/s）电子测量（m/s)测针计算电子测量测针计算电子测量测针计算电子测量测针计算电子测量2872.86.1478526336.0184377840.01

4、57913930.016477821172036.0029168414.57370.198420.21695.2356195.2263825205.7248010575.5953844170.015975030.016722554160197.7064156576.22710.2034420.2233035.2046565.19472615124.330338554.2557154210.016752130.017344771121176.3163119088.12950.224070.2391695.0834185.07586810083.4265777243.3894632880.01

5、78361570.01822890695886.2826794847.705520.2513010.2607614.9817564.9770276302.6862937542.6591925940.0181382540.0185098575170.8389474412.464360.2585950.2674034.8760494.8716463782.1265020162.1051941370.0173668930.01772023359506.1282258909.867620.2397220.2484694.7745624.7701882521.6653963411.656959022

6、0.0188767520.01906948446602.959946366.857530.2759270.2803394.6684144.6662081261.1468878481.0979242150.0199017190.02171639632093.4825630723.328090.2988910.3367884.5064174.487468表三经验公式计算λ阻力系数λLg100λ来自测针计算Re来自电子测量Re来自测针计算Re来自电子测量Re0.0193690290.0194117010.2871078540.2880635960.0195145150.0195626920.29

7、03577550.2914286170.0201554860.0201993290.3043932670.3053369480.0207868270.0208184010.3177882080.3184473630.0215411840.0215748640.3332695620.3339480730.022364750.02240250.3495640440.3502964780.0233350210.02335639