西安交通大学流体力学边界层测定实验报告

1、实验数据处理及计算：T=25Pa=96.6Kpa=1.13Kg/m3=1.58×10-5m2 /s距前缘X=150mm坐标初值Y0：0.45mm雷诺数232594.9（微压计）边界层厚度5.95mm(微压计)264968.4（差压传感器）6.00mm（差压传感器）边界层距离微压计静压/mmH2O微压计读数/mmH2O边界层内流速m/s速度比u/v差压传感器静压/Pa差压传感器读数/Pa边界层内流速m/s速度比层流理论值u/V紊流理论值u/V0.45-36.30-20.8516.360.67-364.64-210.9418.640.670.110.690.95-36.30-17.251

2、8.170.74-364.64-176.4020.630.740.240.771.45-36.30-15.0019.210.78-364.64-150.3522.010.790.360.821.95-36.30-12.1520.460.84-364.64-125.4623.250.830.470.852.45-36.30-10.2021.260.87-364.64-102.6924.330.870.580.882.95-36.30-7.8022.220.91-364.64-83.4825.210.900.680.913.45-36.30-6.4522.740.93-364.64-64.8126

3、.030.930.770.933.95-36.30-4.3523.530.96-364.64-47.8926.760.960.850.944.45-36.30-3.6023.800.97-364.64-37.3427.180.970.910.964.95-36.30-2.5524.180.99-364.64-28.5627.560.980.960.975.45-36.30-2.2524.180.99-364.64-23.5527.760.990.990.995.95-36.30-1.6524.501.00-364.64-20.0027.911.001.001.006.45-36.30-1.62

4、24.511.00-364.64-18.5627.971.001.001.00150mm 截面数据250mm 截面数据距前缘X=250mm坐标初值Y0：0.45mm雷诺数387658.2（微压计）边界层厚度6.95mm(微压计)390031.6（差压传感器）6.95mm（差压传感器）边界层距离微压计静压/mmH2O微压计读数/mmH2O边界层内流速m/s速度比u/v差压传感器静压/Pa差压传感器读数/Pa边界层内流速m/s速度比层流理论值u/V紊流理论值u/V0.45-36.30-21.0016.280.66-364.640-214.77016.290.6610.0970.

5、6760.95-36.30-18.4517.590.72-364.640-184.27017.870.7250.2040.7691.45-36.30-15.9019.210.78-364.640-165.45018.780.7620.3580.7531.95-36.30-14.2519.550.80-364.640-146.38019.650.7970.4100.8342.45-36.30-12.6020.260.83-364.640-126.65020.520.8320.5070.8622.95-36.30-11.1020.900.85-364.640-106.92021.360.8670.

6、6000.8853.45-36.30-9.3021.630.88-364.640-93.88921.890.8880.6830.9053.95-36.30-7.9522.160.90-364.640-79.70622.460.9110.7610.9224.45-36.30-6.1522.860.93-364.640-66.98722.950.9310.8290.9384.95-36.30-5.2523.190.95-364.640-51.14723.560.9560.8880.9535.95-36.30-3.0024.020.98-364.640-33.36224.210.9860.9700.

7、9786.95-36.30-2.4024.240.99-364.640-23.85124.560.9961.0001.0007.45-36.30-1.6524.501.00-364.640-21.31524.651.0001.0001.000数据结果分析：1. 由雷诺数判断流态：Re微压计差压传感器150mm截面232594.9264968.4250mm截面387658.2390031.6临界雷诺数Re=3*1053*106流态判断：150mm截面为层流流动  250mm截面为层流向紊流过度区域2.根据边界层的速度分布判断流态：  由绘制的曲线分析，实测曲线均与紊流理论曲线

8、吻合较好。 判断结果为：150mm截面、250mm截面均为紊流流态3.根据边界层厚度判断流态：层流：=5*xV紊流：=0.37*V*x15*x150mm截面250mm截面微压计实测5.95mm压力传感器实测6.00mm微压计实测6.95mm压力传感器实测6.95mm层流1.551.462.012.00紊流4.694.577.057.05由以上数据判断结果为： 150mm截面流态为： 紊流 250mm截面流态为： 紊流实验总结与思考： 通过如上三种方法认为，通过实验，该平板模型在实验流场中，150mm截面处与250mm界面处均为紊流流态。原因可能是风洞中流速过快，以及1截面选择过于靠后，因而测不到或测得层流流态。建议下次试验对100mm截面进行测试。思考题：1.流体的流动状态受到哪些因素的影响？答：Re=LV/,影响因素有特征长度L，,流速u,流体密度,流体粘度