结构体高速倾斜入水的尾拍载荷及姿态稳定性

打开文本图片集

中图分类号：0352 国标学科代码：13025 文献标志码：A

Abstract：To understand the multiple tail-slapping the trans-media vehicle going through during the high-speed water entry， which may causedamage to the main structure and itsaccessories.The study was conducted toinvestigate the load characteristicsofthemainbodyofthetrans-media vehicleanditsaccessories inthestages ofthe generation，developent，nd collapse ofcavitiesunder theconditionof inclined water-entering withanatack angle，basedontheVOF multiphase flow method.Theinfluenceof the waterentryinclinationangleonthe tail-slapping load，cavitycollpseloadandthe trajectory stabilityarerevealed.Theresultsshowthatthecavitycollpsestage is themostdangerous workingconditionduringthewater entry proces.As the water entry inclination angle increases，the axial and normal forces on the structure increase inthe cavitatiocolapsestage，whilethenormaloverloadcoefficientapproachesaconstant.Whentheinclinationangleintothe Water increased from 60∘ to 90∘ ， the pitch moment coefficient of the structure increased by 47.1% . A larger inclination angle canreduce theaxialand nomaloadsofthehorzontalruddersduringthecavitycollpsestage，andalsoimprove thetrajectory stabilityofthevehicle.However，itwillincreasetheaxialloadsoftheverticalruddersatthesame time.Whenthecavitywal impacts the tailof the trans-media vehicle during thecavitycolapse stage，thethree-directionalrotation of the bodyis

suppressed， causing itto be inabrief state of rest.

Keywords： High-speed water entry; tail-slapping; tail rudder; the cavity collapse; the trajectory stability

跨介质结构体的高速入水过程涉及湍流、相变、高速射流、多相流相互作用等复杂的物理现象，具有高度非定常、非线性的特点。（剩余18036字）