强动载下加载压力与间隙尺寸对间隙射流形成的影响

打开文本图片集

中图分类号：0383 国标学科代码：13035 文献标志码：A

Effects of loading pressure and gap dimension on the formation of gap jet under strong dynamic loading

KANG Huaipu， DENG Qiuyang， REN Guowu， SUN Zhanfeng， CHEN Yongtao， TANG Tiegang （Institute of Fluid Physics，China Academy of Engineering Physics，Mianyang 62199，Sichuan，China）

Abstract： Tolerances in machining and assmbly often result ingaps within engineering structures. Under strong dynamic loading，gap jetsmayform withinthese gaps，thereby posing athreattothereliabilityandsafetyofthestructure.However，the formationmechanismofgapjetsdiersfromthatof traditionalhig-speedmetaljetsanditsformationprocestillrequires systematic study. Hypervelocity impact loading experiments on tungsten samples with gaps were conducted using a two-stage light gas gun，andthe formationand evolution ofthe gap jet were recorded usingahigh-speed framingcamera.Anumerical model for predicting the formation of gap jets was established using ANsYS Autodyn，and theapplicabilityof the numerical simulation method was validatedbycomparing the numericalresults with the jetmorphologyand head velocity historydata obtained from arepresentative experiment.Theefects offlyer velocity，gap width，and gap half-angle on the formationof the gapjet were investigated byadjusting these parametersin the numerical model，andthevariations in thegap jet head velocity andmass withrespect tothese factorswereobtained.The limitationsofthe steady-state jet modelwereanalyzed，and an empiricalmodel wasdeveloped to predict the jetheadvelocityand massbasedonthefindings from numericalsimulations.The results showthat the numerical model based on the Eulerian methodcan accuratelypredict the formation ofthe gap jetunder strong dynamic loading.Loading pressure is foundtobethemain factorcontrolingthe jet headvelocityandmass;as the loading pressure increases，both the jet head velocityand massincreaseaccordingly.The gap width and half-angle have litle effect onthe jet head velocity，but themass increases linearly with the gapwidthand half-angle.Duetosignificant erors in estimatingthegapclosingvelocitythesteadyjetmodelfailstoaccuratelypredicttheformationofthegapjet.Incontrast，the developed empirical model shows good agreement with the numerical results.

Keywords：hypervelocity collision; high-speed jet; loading pressure; gap width; gap half-angle

在国防和军事应用领域，强动载下产生的高速金属射流一直是研究的重点。（剩余14209字）