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1、流量计校核、实验操作1. 熟悉实验装置，了解各阀门的位置及作用。2. 对装置中有关管道、导压管、压差计进行排气，使倒U形压差计处于工作状态。3. 对应每一个阀门开度，用容积法测量流量，同时记下压差计的读数，按由小到大的顺序 在小流量时测量8-9个点，大流量时测量5-6个点。为保证标定精度，最好再从大 流量到小流量重复一次，然后取其平均值。4. 测量流量时应保证每次测量中，计量桶液位差不小于100mm或测量时间不少于40s。、数据处理1数据记录计量水箱规格：长 400mm；宽300mm管径 d (mm): 25孔板取喉径d (mm): 15.347查出实验温度下水的物性：密度 p = 996.2
2、542 kg/m3粘度 卩=0.000958 PaS2.数据处理 du P d P 4V 4V PRe2 =d2V UcAc 二C0A0 2：p/贝UC。： bU0坪p/P孔板流量计试验数据处理左/cm右/cmA R/m时间t/s水箱 高度 h/cm体积V/m3流量_,3-1Qv/m s流速V/m s-1空流系数C0雷诺数Remin57.057.0Qv=h.S/tv= 4qvn d2V=C.2gRRe=dv p/ maix33.145.3133.746.30.126406.7 ().0081932.05E-041.10780.704916916.60238.247.10.089416.1 ()
3、.0074541.82E-040.98330.744515014.92340.648.80.082415.7 ().0070221.71E-040.92640.730714146.29442.548.90.064405.2 ().0064061.60E-040.86620.773413228.02543.849.40.056414.9 ().0060371.47E-040.79640.760112160.84645.650.30.047414.5 ().0055441.35E-040.73130.762011168.12747.951.30.034413.9 ().0048051.17E-04
4、0.63380.77649679.04849.452.20.028413.5 ().0043121.05E-040.56880.76788686.32951.653.30.017412.9 ().0035738.71E-050.47130.81657197.23150.952.80.019403.0 ().0036969.24E-050.49980.81897631.55248.751.60.029413.7 ().0045581.11E-040.60130.79769182.68347.150.80.037404.0 ().0049281.23E-040.66630.782510175.40
5、444.749.90.052414.70.005791.41E-040.76380.756611664.48542.548.80.063415.2 ().0064061.56E-040.84510.760512905.39640.848.00.072415.6 ().0068991.68E-040.91010.766113898.11737.647.10.095416.3 ().0077621.89E-041.02390.750315635.37835.346.20.109416.9 ().0085012.07E-041.12140.767217124.45933.445.60.122406.
6、7 ().0082542.06E-041.11610.721817043.80IgQv孔板流量计R-Qv双对数坐标图L111111-0.600-4.100-4.050-4.000-3.950-3.900-3.850-3.800-3.750-3.700-3.650-2.000文丘里流量计实验数据处理左/cm右/cmA R/m时间t/s水箱咼 度h/cm体积V/m3流量_,3-1Qv/m s流速V/m s-1空流系数C(雷诺数Remin66.366.3Qv=h.S/tv= 4qv n d2V=C(. j2gRRe=dv pmax19.057.8129.662.70.3314017.70 ().02
7、185.45E-044.4721.75655449.87234.164.10.34116.36 ().02024.92E-044.0321.66350001.92340.366.10.2584014.80 ().01824.56E-043.7391.66346364.86444.466.30.2194013.40 ().01654.13E-043.3851.63441979.00548.466.90.1853610.90 ().01343.73E-043.0601.60737941.22652.567.10.1464011.80 ().01453.63E-042.9811.76236966.5
8、8756.566.40.099419.26 ().01142.78E-042.2821.63928301.82860.565.70.052407.00 ().00862.16E-041.7681.75221929.33163.365.30.02404.95 ().00611.52E-041.2511.99715507.17259.465.70.063417.95 ().00982.39E-041.9601.76324298.00356.466.20.098409.48 ().01172.92E-042.3951.72829698.57451.966.40.1454011.02 ().01363
9、.39E-042.7841.65134523.03545.365.40.2014013.80 ().01704.25E-043.4861.75743232.10640.765.20.2454013.68 ().01694.21E-043.4561.57742856.17737.065.00.284015.75 ().01944.85E-043.9791.69949340.98832.165.20.3314116.40 ().02024.93E-044.0421.58750124.17927.163.90.3684017.30 ().02135.33E-044.3711.62754196.76文丘里流量计C0-Re单对数坐标图4.504.604.704.804.104.204.304.402.500C 2.0001.5001.0000.5000.000IgRe3结果分析Co由孔板锐口的形状、测压口位置、孔径与管径之比和雷诺数Re所决定。根据上图得当Re数增大到一定值后，Co不再随着Re而变，成为一个和孔径与管径之比有关的常数。经典资料，WORD文档，可编辑修改，欢迎下载交流。 经典资料，WORD文档，可编辑修改，欢迎下载交流。