2018年华南理工大学807水力学考研真题.pdf

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1、8072018115 2 301a N b Pac N/kg d m /s22a b 1c d3a bc d4abcd5a bc d6 d1=320mm d2=160mm v1=1.5m/s v2a 3m/s b 4m/s2c 6m/s d 9m/s7 77a p1p2; b p1= p2; c p1 p2; d8 8 1 2l2 = 3l18a Q1= Q2; b Q1=1.5 Q2; c Q1= 3Q2; d Q1= 1.73Q29a bc d103a bc d11a bc d12a bc d13a Reb Ks/dc ReKs/d d Rel14 14 3m PyD14a 1.25m b

2、 1.5mc 2m d 2.5m15 za bc d15 2 30416 0.005Pa.s 850kg/m3_m2/s 17 17 U A Bhp=10cm Pa-Pb= kpa1718 b=3.0m m=0.25d=0.4mgm21920212223 23 h =60mm m/s52324 15cm 20cm 0.15m/s1.31 10-6m2/s25 d =2cm H =2mL/s26272829305 6 3031 31 ic6i ici ic3132 d = 180mm = 10mm v = 2m/s, 1.0 106Pa1435m/s 2.1109N/m2101010Pa33 b =3m m =2 h =1.2m i =0.0002 n=0.022534 q Hg q35 35354 15 6036 36 h1= 60cm h2=100cm7h = 25cm R = 0.5m AB3637 37 b =2m h1=4mh2=0.5m Q=8m3/s3738 38 A d =25mm l =10mB A P1=2at H1=1m H2=5m=0.025v=4.0b=0.3A B83839 39100m h0= 2m H = 4m k =0.001cm/s R=200m1 Q2 100m C39