河海大学研究生考试水力学2006真题答案

河海大学2006年攻读硕士学位研究生入学考试试题解析2．×AT．√【点评】要区别几组概念：①恒定流与非恒定流：运动要素是否随时间变化来区分。RR大于2320的为紊流。②层流和紊流：下界雷诺数小于2320的为层流，下界雷诺数ee③均匀流与非均匀流：流速的大小和方向是否沿流线变化来区分。uuuuu对紊流来说，其中为脉动流速，为时均流速。如果时均值不随时间变化，称为（时均）恒定流。．×Rde．√．×．×．×h、hhcoco2t(hh)dco2t．×v2Ezpv22g2ggSEzp；Sg．×lt0t至cll至t从tcc．×p、、vMpLLT2MLvTLT3．√hnic．√p[0,)；absp,pppp；rabsaaappp,p；avaabs．×zgpc；2．）0①<，0②<<+，001③>+，010．）v2Ezp；2ggEzp；g．）v．）．）v2pv2pz1zh；22111222ggg2gwvvp1p22zzzz1与h；112222g2gw12g2pp12g．）12mv2vv2221；Fr2ghmgh1．）①当HH，mm；ddHH，mmddHH，mmdd．）l．）(0.7~0.8)l。jvkJhhwlwlk．）FrFrpm．）R2320）e．）TT与TsrsTTsrTTsr2．．，紊vd10.0110000R2320R0.01104ee30/m30/m，．22pp689830KN/m2p；rabsappp30/m2p。vaabsr．．0.74mq2Qbh及q；3gcQ12q2m/sh4q2，0.74m；233b6g9.8c由hhc．，．堰e/H0.65e/H0.65e/H0.75e/H0.75e/H3/40.75．5，hh2co21.05，hco2m/s．72m5qkh10307.8910m/s，；mn772n191n1m—mmn—hn．cH(vc)30gcvv0．0.4mL5m；PghAR；xxcxφRhHxc2h2.31.2743.574mx101.274m4cgHAARL0.452mxBP0.8109.813.57425.6110N()34xPgv0.810009.819.4327.40210N()4z3VR(Hx)LRL241340.45529.432m3PzPx【定哪部分液体作用，一定要找出该部分液面的自由液面。．200v2hh00002N2g12v2g(hh)12212211vpv1h21g2h20032v212g2ghh2hhg2M222312p13vhhv2g(hh)212g211313AvhhH2而1Av21hhhh211313即AHAhh11213A2hhA1H13Q2Ddd312．23pv1gpv220022122ggg1412v1Dvd2242v2d24821v2D299而vA1Q1ppv1gv21g229.6422v4.95m/s,v5.57m/s22gg12pKPa2Q12pAcos60R2vcos60QvQvQvpA112222x21211RpA2pAcos60QvQv1.2410N()62x112221Q02psin60R2vsin6022y2R3pAQvsin601.7510N6y222arctanR54.68yxRRRR2.1410N226xy．uu2x22x20）yxxyuyxux2x4y2yx2xy2yuxxyx2x4y2y(,)()xyxyxyyfx22222xy2yf(x)2xy2yxf(x)0f(x)c(,)222xyxyxyyc21u1u）W）q(2)[2y(4)]0yx2zxy(3123121)(5125121)2222962(25102)20m/s2故q20m2/s。．m1.25QQCARiiCAR22ARx1Ab2mhb)hmR0.5222xb2(mh)h4.22221111CR0.2535.7866n0.025i0.0008vCR