垂直发射条件下水下航行体通气云空泡的数值模拟与实验  

Numerical simulation and experiment of ventilated cloud cavitation on underwater vehicle under vertical emission conditions

作　　者：任泽宇 王小刚[1] 程少华 权晓波 REN Zeyu;WANG Xiaogang;CHENG Shaohua;QUAN Xiaobo(School of Astronautics,Harbin Institute of Technology,Harbin 150001,China;Beijing Institute of Aerospace Systems Engineering,Beijing 100076,China)

机构地区：[1]哈尔滨工业大学航天学院,哈尔滨150001 [2]北京宇航系统工程研究所,北京100076

出　　处：《航空学报》2023年第21期258-268,共11页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(U20B2005)。

摘　　要：针对垂直发射条件下通气云空泡的流动特性,以水下航行体为研究对象,采用改进型延迟分离涡模型(IDDES)进行非定常数值模拟,通过引入混合尺度加速了雷诺时均(RANS)到大涡模拟(LES)的转换计算,提高了湍流应力的计算精度;同时搭建了垂直约束式水下发射平台,采用定量排气的方式研究了通气云空泡的发展过程,验证了数值方法的有效性。研究发现:气液交界面在旋涡流动的作用下发生失稳,部分水相通过气液界面汇入通气空泡中发生气液掺混,形成云空泡;云空泡的发展为尺寸扩张和气液掺混同时进行的动态发展过程;在通气云空泡的作用下,流体速度梯度是云空泡影响涡量输运的主要作用因素。To study the flow characteristics of the ventilated cloud cavitation under vertical emission conditions,an Im⁃proved Delayed Detached Eddy Simulation(IDDES)model is used to conduct non-constant numerical simulations with the underwater vehicle as the research object.The introduction of hybrid scale accelerates the Reynolds Average Navier-Stokes(RANS)to Large Eddy Simulation(LES)conversion calculation and improves the calculation accuracy of turbulent stresses.A vertically constrained underwater launch platform was built,and the development process of ven⁃tilated cloud cavitation was studied using the quantitative exhaust method,while the validity of the numerical method was verified.It was found that the gas-liquid interface was destabilized under the action of vortex flow.After that,part of the water phase converged through the gas-liquid interface into the ventilated cavitation,and gas-liquid mixing oc⁃curred to form cloud cavitation.The evolution of cloud cavitation is a dynamic development process,where size ex⁃pansion and gas-liquid admixture are simultaneous.

关 键 词：水下航行体 垂直发射 通气空泡 云空泡 涡量输运(IDDES) 

分 类 号：V211.17[航空宇航科学与技术—航空宇航推进理论与工程]