Experimentalinvestigationsonbehaviors

ofprojectilehigh-speedwaterentry

ZHANG Wei; GUO Zi-tao; XIAO Xin-ke; WANG Cong

doi:10.11883/1001-1455(2011)06-0579-06

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ZHANG Wei, GUO Zi-tao, XIAO Xin-ke, WANG Cong. Experimentalinvestigationsonbehaviorsofprojectilehigh-speedwaterentry[J]. Explosion And Shock Waves, 2011, 31(6): 579-584. doi: 10.11883/1001-1455(2011)06-0579-06

Citation:

ZHANG Wei, GUO Zi-tao, XIAO Xin-ke, WANG Cong. Experimentalinvestigationsonbehaviors ofprojectilehigh-speedwaterentry[J]. Explosion And Shock Waves, 2011, 31(6): 579-584. doi: 10.11883/1001-1455(2011)06-0579-06

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Experimentalinvestigationsonbehaviors ofprojectilehigh-speedwaterentry

doi: 10.11883/1001-1455(2011)06-0579-06

1.
HypervelocityImpactResearchCenter,HarbinInstituteofTechnology,

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Corresponding author: ZHANG Wei
Publish Date: 2011-11-25

Abstract

Abstract

Water-entryexperimentswereconductedinthevelocityrange35~160m/sfortheprojectilesofthethreedifferentgeometriesincludingflatnose, truncated-ogivalnoseandogivalnose.A digitalhigh-speedcamerawasusedtorecordthedetailedprocessesofwaterentryandcavityexpansion andobtainthehydro-ballistictrajectoriesandcavityshapesintheearlystagesofwaterentryforthe projectilesofthethreedifferentgeometries.Andtheeffectsofthenoseshapesonthehydro-ballistic stabilitieswerecomparedamongtheprojectilesofthethreedifferentgeometries.Comparisonsindicatethattheflatnoseprojectilehasgoodhydro- ballisticstabilityinthewater,thetruncated-ogival noseprojectilewilldeflectinthelatestageofwaterentrywhichisresultedfromthedeflectingforce ontheprojectilenose,bycontrary,theogivalnoseprojectilewilldeflectintheearlystageofwater entrywhichhastheworststability.Byconsideringthecavitationnumberwasavelocity-dependent factor,amodifiedmathematicalmodelwasproposedtopredictthevelocityattenuationofcylindrical projectilesandacavitydimensionmodelwaspresentedbasedontheenergyconservation.Thecalculationsareingoodagreementwiththeexperimentalresults.
- fluidmechanics,
- hydro-ballisticstability,
- velocityattenuation,
- high-speedwaterentry,
- cavityshapes