摘要
水下发射过程中在筒口附近形成气幕通道,可有效降低航行体出筒过程中表面高频脉动载荷.基于流体体积(VOF)均质多相流理论、标准的RNG k-ε湍流模型及重叠网格技术,研究筒口气幕对航行体表面脉动载荷的影响规律,分析气幕环境下的流场结构及流体动力演变特性,对比不同横流强度、燃气质量流率下气幕流场结构演变和出筒降载效果.结果表明,航行体出筒过程中,喷嘴喷出的高速燃气近似覆盖了航行体表面,并逐渐在发射筒口周围形成一个气体通道,显著降低了航形体表面载荷;有气幕条件下,航行体所受力矩与表面载荷均出现明显降低,其中所受力矩峰值降低了80.3%,航行体表面压力峰值最大降低了81.2%;提高横流速度,航行体表面压力峰值最大增加了56.7%;在质量流率由2 kg/s提高到16 kg/s时,航行体所受力矩降低了80.8%,表面压力峰值最大降低了82.8%.
During the underwater launching process,a gas screen channel is formed near the opening of the cylinder,which can effectively reduce the high-frequency pulsation load on the surface of the vehicle exiting the cylinder.Based on the volume of fluid(VOF)homogeneous multiphase flow theory,the standard RNG k-εturbulence model,and the overlaid grid technology,this paper studies the influence law of the gas screen on the surface of the vehicle to improve the pulsating load of the vehicle,and analyses the flow field structure and hydrodynamic evolution under the gas screen environment.The characteristics of the gas curtain flow field structure evolution and the discharge load reduction effect at different cross-flow intensities and gas mass flow rates were compared.The results show that the high-speed gas ejected from the nozzles approximately covers the surface of the vehicle during the exiting process,and gradually forms a gas channel around the opening of the launch vessel,thereby reducing the surface load of the vehicle significantly.Under the condition of gas screen,both the moment and the surface load on the body have been significantly reduced,with the peak value of the moment reduced by 80.3%,and the peak pressure on the surface of the vehicle reduced by 81.2%.However,the peak pressure on the surface of the vehicle increases by a maximum of 56.7%upon increasing cross-flow intensity.Finally,the mass flow rate increases from 2 kg/s to 16 kg/s,with the moment on the vehicle reduced by 80.8%and the peak surface pressure reduced by 82.8%.
作者
施瑶
鲁杰文
杜晓旭
高山
任锦毅
SHI Yao;LU Jiewen;DU Xiaoxu;GAO Shan;REN Jinyi(School of Marine Science and Technology,Key Laboratory of Unmanned Underwater Vehicle Technology of the Ministry of Industry and Information Technology,Northwestern Polytechnical University,Xi’an 710072,China)
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2024年第2期211-219,共9页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金(52171324,U21B2055)
基础科研项目(JCKY2021607B031,JCKY2021206B012)
中央高校基本业务费(3102019JC006)。
关键词
航行体
多相流
脉动载荷
气幕降载
水动力特性
vehicle
multiphase flow
pulsating load
gas screen load reduction
hydrodynamic characteristics
