不同长径比下圆柱套筒的破片初速轴向分布

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中图分类号：O381;TJ410 国标学科代码：1303520 文献标志码：A

Axial distribution of fragment initial velocities from cylindrical casing with different length-to-diameter ratios

BIWeixin，LIWeibing，LIJunbao，ZHUWei，LI Wenbin （MinisterialKeyboatoyjingUversitfiencendologyjing，a）

Abstract：Toaccuratelypredicttheinitialvelocitydistributionofcylindricalcasingundercentralpointdetonationatoneend with different length-diameter ratios （L/D） ， it studied the impact of L/D on the initial velocity of fragments and the applicability of existing empirical models for theinitial velocityoffragments foundedonthe numerical modelof experimental verification. On this basis， a correction term related to L/D ，which was often influenced by the axial rarefaction waves，was added to the fragment initialvelocityindex model.Byfitingthedataobtainedfromnumericalsimulations，thefunctionexpressionof the correction term was derived and thecalculation model for the initial velcity distribution ofcylindricalcasing with L/D⩾1 was obtained.Finally，theapplicabilityoftheestablishedfragmentinitialvelocitycalculationmodelwasvalidatedthrough experimentaldataandnumerical simulations.Theresearchresults indicate thattheinitial velocitydistributionoffragments under different L/D exhibits a trend where the initial velocities are lower at both ends and higher in the middle. Additionally， as the L/D raises，the initialvelocityofthe fragmentalsoincreases.When the L/D reaches5，the relative error between the maximum initial velocity of the fragments and the calculated result using the Gurney formula is only 1.99% .However， the existingmodels forcalculating initial velocitiesoffragment displaysignificanterrorswhen predictingsmaler L/D in cylindrical casing.The averageeror between the formula calculation resultsandtheexperimental andnumerical simulation results does not exceed 6% ，indicating that the proposed model is reliable for predicting the initial velocity distribution of fragmentsunder different L/D

Keywords：cylindrical casing; fragment initial velocity;length-to-diameter ratio; axialrarefaction wave

装满炸药的圆柱套筒是破片型武器最常用的结构。（剩余13069字）