西安交通大學(xué)流體力學(xué)邊界層測(cè)定實(shí)驗(yàn)報(bào)告

1、實(shí)驗(yàn)數(shù)據(jù)處理及計(jì)算:T二25CPa=96.6Kpap=1.13Kg/m3V=1.58X10-5m2/s150mm截面數(shù)據(jù)距前緣X=150mm坐標(biāo)初值YO：0.45mm雷諾數(shù)232594.9（微壓計(jì)）邊界層厚度595mm（微壓計(jì)）264968.4（差壓傳感器）6.00mm（差壓傳感器）邊界層距離微壓計(jì)靜壓/mmH2O微壓計(jì)讀數(shù)/mmH2O邊界層內(nèi)流速m/s速度比u/v差壓傳感器靜壓/Pa差壓傳感器讀數(shù)/Pa邊界層內(nèi)流速m/s速度比層流理論值u/V紊流理論值u/V0.45-36.30-20.8516.360.67-364.64-210.9418.640.670.110.690.95-36.30-1

2、7.2518.170.74-364.64-176.4020.630.740.240.771.45-36.30-15.0019.210.78-364.64-150.3522.010.790.360.821.95-36.30-12.1520.460.84-364.64-125.4623.250.830.470.852.45-36.30-10.2021.260.87-364.64-102.6924.330.870.580.882.95-36.30-7.8022.220.91-364.64-83.4825.210.900.680.913.45-36.30-6.4522.740.93-364.64-64

3、.8126.030.930.770.933.95-36.3043523.530.96-364.64-47.8926.760.960.850.944.45-36.30-3.6023.800.97-364.64-37.3427.180.970.910.964.95-36.3025524.180.99-364.64-28.5627.560.980.960.975.45-36.3022524.180.99-364.64-23.5527.760.990.990.995.95-36.30-1.6524.501.00-364.64-20.0027.911.001.001.006.45-36.30-1.622

4、4.511.00-364.64-18.5627.971.001.001.007.006.005.004.003.002.001.000.000.200.400.600.801.001.20輕區(qū)呃除刃一1:一：一：廠_1LOOOOOOOOOOOOOOOO76543210微壓計(jì)測(cè)度比與邊界層距離關(guān)系差壓傳感器測(cè)得速度比與邊界層距離關(guān)系250mm截面數(shù)據(jù)距前緣X=250mm坐標(biāo)初值Y0：0.45mm雷諾數(shù)387658.2（微壓計(jì)）邊界層厚度695mm（微壓計(jì)）390031.6（差壓傳感器）6.95mm（差壓傳感器）邊界微壓計(jì)微壓計(jì)邊界速差壓傳差壓傳邊界速度層流紊流層距靜壓讀數(shù)層內(nèi)度感器靜感器讀層內(nèi)比

5、理論理論離/mmH2O/mmH2O流速比壓/Pa數(shù)/Pa流速值值m/su/vm/su/Vu/V0.45-36.30-21.0016.280.66-364.640-214.77016.290.6610.0970.6760.95-36.30-18.4517.590.72-364.640-184.27017.870.7250.2040.7691.45-36.30-15.9019.210.78-364.640-165.4501&780.7620.3580.7531.95-36.30-14.2519.550.80-364.640-146.38019.650.7970.4100.8342.45-36.30

6、-12.6020.260.83-364.640-126.65020.520.8320.5070.8622.95-36.30-11.1020.900.85-364.640-106.92021.360.8670.6000.8853.45-36.30-93021.630.88-364.640-93.88921.890.8880.6830.9053.95-36.30-7.9522.160.90-364.640-79.70622.460.9110.7610.9224.45-36.30-6.1522.860.93-364.640-66.98722.950.9310.8290.9384.95-36.30-5

7、.2523.190.95-364.640-51.14723.560.9560.8880.9535.95-3630-3.0024.020.98-364.640-33.36224.210.9860.9700.9786.95-3630-2.4024.240.99-364.640-23.85124.560.9961.0001.0007.45-3630-1.6524.501.00-364.640-2131524.651.0001.0001.000-0微壓計(jì)測(cè)速度比與邊界層距離關(guān)系7.00I微FQI4測(cè)曲線；-層流理論曲線:Jrf|衣流理論曲線A產(chǎn)H：/：“9r6.005.004.003.002.001.

8、000.000.0000.2000.4000.6000.8001.0001.2000層流理論曲線左壓傳感器測(cè)得曲線o紊流理論曲線差壓傳感器測(cè)速度比與邊界層距離關(guān)系55:J/AAT8.007.006.005.004.003.002.001.000.000.0000.2000.4000.6000.8001.000數(shù)據(jù)結(jié)果分析：由雷諾數(shù)判斷流態(tài):Re微壓計(jì)差壓傳感器150mm截面232594.9264968.4250mm截面387658.2390031.6臨界雷諾數(shù)Re=3*105-3*106流態(tài)判斷：150ium截面為層流流動(dòng)250mm截面為層流向紊流過(guò)度區(qū)域根據(jù)邊界層的速度分布判斷流態(tài)：由繪制的

9、曲線分析，實(shí)測(cè)曲線均與紊流理論曲線吻合較好。判斷結(jié)果為：150mm截面、250iran截面均為紊流流態(tài)根據(jù)邊界層厚度判斷流態(tài)：層流:5=5*腭紊流：6=0.37f粒6150mm截面250mm截面微壓計(jì)實(shí)測(cè)5.95mm壓力傳感器實(shí)測(cè)6.00mm微壓計(jì)實(shí)測(cè)6.95mm壓力傳感器實(shí)測(cè)6.95mm層流1.551.462.012.00素流4.694.577.057.05由以上數(shù)據(jù)判斷結(jié)呆為：150mm截面流態(tài)為：紊流250mm截面流態(tài)為：紊流實(shí)驗(yàn)總結(jié)與思考：通過(guò)如上三種方法認(rèn)為，通過(guò)實(shí)驗(yàn)，該平板模型在實(shí)驗(yàn)流場(chǎng)屮,150mm截面處與250mm界面處均為紊流流態(tài)。原因可能是風(fēng)洞屮流速過(guò)快,以及1截面選擇過(guò)于靠后，因而測(cè)不到或測(cè)得層流流態(tài)。建議下次試驗(yàn)對(duì)100mm截面進(jìn)行測(cè)試。思考題：流體的流動(dòng)狀態(tài)受到哪些因素的影響？答：Re=LVp/M，影響因素有特征長(zhǎng)度L