简介:Aseriesofprojectileandwater-tunnelexperimentswereconductedtoinvestigatetheshapecharactersofnaturalandventilatedsupercavitation.Itwasfoundthattheshapeanddimensionsofboththenaturalsupercavitationandtheventilatedsupercavitationaresimilarthroughthecomparisonofthemwhenthecavitationnumberissmallandequal,andthecontourofboththenaturalsupercavitationandtheventilatedsupercavitationcanbecalculatedeffectivelywiththeSavchenkoformula.Thegravityeffectcaninducetheasymmetryofventilatedsupercavitation,andtheasymmetryismoreapparentastheFroudenumberissmaller.Theempiricalformulaforcalculatingtheaxialdeformationofventilatedsupercavitationwascorrectedandexpandedbasedonexperimentdata.Theevolutionrulesofboththenaturalsupercavitationandtheventilatedsupercavitationweredescribed,andthevortexfrequencyofnaturalcavitationwasobtained.Inaddition,thehystereticaspectwasobservedbetweenthedevelopmentandthefallprocessofventilatedcavitation.