简介：Comparedtootherunderwatervehicles,supercavitatingvehiclescanattainahighspeedbecausetheyeliminatedragbycreatingalargecavity,thusestablishingtheso-called"supercavitatingcondition."Suchacavityisdifficulttodevelopundernormalconditions,hence,ventilationisusedtoattainthesupercavitatingconditionintheinitialphaseofflight.Inthispaper,wefocusonthehydrodynamiccharacteristicsofaventilatedsupercavitatingvehicle.First,dynamicmodelingofthesupercavitatingvehicleisperformedtocalculatethehydrodynamicforce/momentactingonthevehicleforagivensizeofcavity.Wethendefinetherelationshipbetweentheventilationrateandthecavitationnumberbasedonanairentrainmentmodeloftheventilatedcavity.Numericalsimulationswereperformedtoanalyzethephysicalfeasibilityandcharacteristicsofthemodeling.Theresultsshowthatthecavitylength/radiusincreaseswiththeventilationrate,provingthatventilationcanbeusedtoattainthesupercavitatingcondition.

简介：Inthispaper,perturbationmethodandFourier-cosine-expansionmethodareusedtosolvea3-DnonlinearproblemofasupercavitatingflowinaninclinedfieldofgravityatlargeFroudenumbers.Byexpandingthevelocitypotentialintoapowerseriesofasmallparameter,theoriginal3-Dnonlinearproblemisreducedtoanumberof2-Dones.Thesolutionsofthefirstthreeordersarederivedindetailandexpressedintermsofthecompleteellipticintegralsofthefirstandsecondkinds.Thentheboundaryintegralequationmethodisappliedtogetthenumericalsolutionsforeachorder.Computationalresultsareprovidedforsupercavitatingflowspastconesundervariousflowconditions.

简介：A3-DnonlinearproblemofsupercavitatingflowpastanaxisymmetricbodyatasmallangleofattackisinvestigatedbymeansoftheperturbationmethodandFourier-cosine-expansionmethod.Thefirstthreeorderperturbationequationsarederivedindetailandsolvednumericallyusingtheboundaryintegralequationmethodanditerativetechniques.Computationalresultsofthehydrodynamiccharacteristicsandcavityshapesofeachorderarepresentedfornonaxisymmetricsupercavitatingflowpastconeswithvariousapex-anglesatdiffer-entcavitationnumbers.Thenumericalresultsarefoundingoodagreementwithexperimentaldata.

简介：为了在supercavitating上处理可压缩的液体的效果，溢出射弹的亚声的磁盘cavitator，一个有限的卷方法基于理想的可压缩的潜在的理论被提出。由使用连续性方程和Tait状态方程以及Riabouchinsky闭合模型，一个反的问题答案为supercavitating流动被介绍。根据supercavity的表面上的刺不进的条件，为supercavity形状的一个新反复的方法被设计在supercavity形状上处理压缩的可能性的效果，压力拖系数和密度地。由这个方法，低成穴数字能被计算。计算结果与试验性的数据和实验公式同意很好。以亚声的条件，液体压缩的可能性将使supercavity成为长度和半径增加。supercavity扩展，但是留下球状体。supercavity的第一1/3部分上的效果不是明显的。成穴数字或马赫数字增加的射弹增加的drag系数。与马赫数字增加，压缩的可能性是越来越重要的。根据supercavitating流动的精确计算被担心，压缩的可能性必须被考虑。