高壓水射流沖擊水泥混凝土數(shù)值模擬與分析.pdf

1、長沙交通學院碩士學位論文高壓水射流沖擊水泥混凝土數(shù)值模擬與分析姓名：毛昆立申請學位級別：碩士專業(yè)：機械設(shè)計及理論指導教師：李自光李萬莉20030501AbstractTurbulentimpingingjetflowiSwidelyappliedintheindustrialprocessessuchasmaterialcuttingsurfaceheatingbecauseofitshighlevelofimpactandlocalh

2、eattransferatthestagnationpointonthesurfaceimpingedThehydrokineticsmodelofthehigh—pressurewaterjetfromcircularnozzleverticallyimpingingontheconcreteisestabljshedandthemodeliSnumericallysimulatedandbyanalyzingtheresultthe

3、influenceofmaximalpressurefrompressure—generatingequipmentdimensionlessimpingingheightonthepressureofthestagnationandthenearregionontheconcreteisfoundTheresearchprovidesthetheoreticalbasesforthedevelopmentofthehigh—press

4、urewaterjetcuttingequipmentforconcreteroadsurface，andforthefurtherresearchonthebreak—uptheoryoftheconcreteroadsurfaceimpingedbythehigh—speedwaterjettooThecontentismainlyasfollows(I)Thestandard女一fmodeliSestablishedintheax

5、ialsymmetricalcoordinatesforthehighpressurewaterjetfromcircularnozzleimpingingtheconcreteandtheboundaryconditionsareconfirmedbyselectingtheimpingingregionasthecomputationalregion(2)Inthecomputationalregionthecontrolequat

6、ionsofthestandardk—fmodelarediscretizedbyfinitevolumeintegrationmethodwithstaggeredgrid；ThediscretizedpartialdifferentialequationsarecalculatednumericallybyprogrambasedonSIMPLER(SemiImplicitMethodforPressure—LinkedEquati

7、onsRevised)scheme(3)Underfourtypesofpumppressureincluding300MPa，250MPa，180MPaand120MPa，andfourtypesofdimensionlessimpingingheightincluding12，l6，20and25，theimpingingjetmodelsaresimulatedrespectively，andtheinfluenceofthepu