旋成体高速入水可压缩性影响研究  

Effect of Fluid Compressibility on High-speed Water-entry of Revolutionary Body

作　　者：李国良[1] 尤天庆 孔德才 李静 周伟江[1] LI Guoliang;YOU Tianqing;KONG Decai;LI Jing;ZHOU Weijiang(The First Research Institute, China Academy of Aerospace Aerodynamics, Beijing 100074, China;Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China)

机构地区：[1]中国航天空气动力技术研究院一所,北京100074 [2]北京宇航系统工程研究所,北京100076

出　　处：《兵工学报》2020年第4期720-729,共10页Acta Armamentarii

基　　金：装备发展部共用技术基金项目(41406040402);国家自然科学基金项目(11772317)。

摘　　要：针对目前高速(≥100 m/s)跨水-气体界面多相流数值模拟中空化效应和水介质可压缩性影响等问题,建立一套高速入水数值模拟方法。以旋成体为计算模型,采用剪应力传递(SST)k-ω、标准(Standard)k-ε、重整化群(RNG)k-ε及可实现(Realizable)k-ε4种湍流模型进行数值模拟,得到速度衰减与入水深度随时间变化的结果及入水1 ms时的空泡形态,并与理论解比较。基于SST k-ω湍流模型与文献[15,17]实验开展对比研究,选取入水速度50 m/s、100 m/s、200 m/s、400 m/s、800 m/s进行计算。研究结果表明:采用SST k-ω湍流模型的数值模拟结果与理论解一致性最好,入水速度衰减、空泡发展与实验结果基本一致,证明该方法的有效性;在入水速度≤100 m/s时,液体可压缩性对入水冲击载荷基本没有影响;在入水速度≥200 m/s时,随着入水速度增加,液体可压缩性对入水冲击载荷影响越大,会弱化入水冲击载荷及延缓最大载荷出现的时间;在考虑液体可压缩性时,空泡形态有收缩现象;入水速度越大,入水过程速度衰减越快,加速度值在入水初期较大;在计算模型周围被超空泡包裹的航行阶段,随着入水深度增加,加速度逐渐减小,加速度的变化逐渐平缓。A set of simulation methods for high-speed(≥100 m/s)water-entry is developed for both cavitation and compressible effects in the numerical simulation of multi-phase flow at water-air interface.The revolutionary body is used as a computing model,and the turbulence models,including SST k-ω,Standard k-ε,RNG k-ε,and Realizable k-ε,are utilized for simulation.The change results of velocity damping and water-entry depth with time are obtained.The cavitation configuration at 1 ms is outlined.The simulated results are compared with the theoretical solutions,and the simulated results by SST k-ωagree with the theoretical solutions.The set of methods is used for the reference experiments in Refs.[15]and[17].Compared with experimental results,the set of methods is validated in terms of velocity damping and cavitation development.Some different water-entry velocities,including 50 m/s,100 m/s,200 m/s,400 m/s and 800 m/s,are regarded as initial condition to be computed.The compressibility of water has no effect on the water-entry impact basically when water-entry velocity is less than 100 m/s.Beyond that,the compressibility of water has much effect on the water-entry impact,which can lessen the impact and delay the time of peak value.In addition,the cavitation configuration has shrunk,especially in the water-air area.With the increase in water-entry velocity,the velocity damping becomes quicker.The acceleration is relatively higher in the beginning of water-entry.During the period of the model covered by supercavitation,the acceleration gradually declines and changes gently with the increase in water-entry depth.

关 键 词：旋成体 高速入水 空化流 可压缩液体 

分 类 号：TJ762.25[兵器科学与技术—武器系统与运用工程]