潜航器垂直出水过程非定常空化流场演化分析  

Evolution Analysis of Unsteady Cavitation Flow Field over Underwater Vehicle Vertical Water-exit Process

作　　者：刘学[1,2] 张志国[1] 徐洪洲[1] 边金尧[1,2] LIU Xue;ZHANG Zhiguo;XU Hongzhong;BIAN Jinyao(PLA 91550 troop,Dalian 116023,China;Postdoctoral station of naval architecture and marine engineering,Harbin 150001,China)

机构地区：[1]中国人民解放军91550部队,大连116023 [2]哈尔滨工程大学船舶与海洋工程博士后流动站,哈尔滨150001

出　　处：《强度与环境》2024年第3期18-27,共10页Structure & Environment Engineering

基　　金：国家自然科学基金(61801482,61971424);中国博士后基金特别资助项目(2020T130772)。

摘　　要：针对潜航器垂直出水过程空泡演化特性分析问题,采用多相混合物模型、完全空化模型和标准k-ε湍流模型,对稳态条件下的潜航器垂直出水过程非定常空化流场演化过程进行建模模拟,以试验中潜航器壁面上若干离散点的压力试验数据与计算模型进行对比,验证了所提数值方法的有效性。通过动态模态分解方法对潜航器周围壁面流场的速度场进行分解与重构,提取各阶模态频率及其变化过程。结果表明,2阶和4阶模态的频率与空泡生成、脱落的频率一致,表征了肩空泡在生长过程中壁面及尾部的大尺度旋涡与回射流的形成、脱落过程,是空化流场演变过程中的主要结流动特征。Cavitation feature analysis of underwater vehicles vertical water-exit process is of vital importance in cavitation hydrodynamics.In this paper,multi–phase mixture model,full cavitation model and vanilla k-ɛturbulence model were used to simulate the unsteady cavitation flow field evolution process over underwater vehicle,and the measured discrete pressure data from a real underwear vehicle’s wall verified the effectiveness of the proposed numerical method.By using dynamic mode decomposition(DMD),the flow field and velocity field of the underwear vehicle was decomposed and reconstructed,and the mode frequency and changing process of various order were also extracted.The result shows that 2-order and 4-order mode frequency coincides with the cavity generation and shedding frequency,which reveals that large scale vortex of wall and tail in cavity generation process and the generation and shedding process of the reentrant jet is the main flow feature in cavitation flow field evolution process.

关 键 词：潜航器 非定常空化 流场 动力学模态分解 重构 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程] O351[理学—流体力学]