水下气体射流的涡扩散理论模型  

Vortex Diffusion Theoretical Model of Underwater Gas Jet

作　　者：陈玮琪 季锦梁 CHEN Weiqi;JI Jingliang(Beijing Research Institute of Electrical and Mechanical Engineering,Beijing 100078,China;China Ship Scientific Research Center,Wuxi 214082,China)

机构地区：[1]北京机电工程研究所,北京100078 [2]中国船舶科学研究中心,江苏无锡214082

出　　处：《数字海洋与水下攻防》2020年第1期18-23,共6页Digital Ocean & Underwater Warfare

摘　　要：针对移动通气孔产生的水下气体射流开展了理论研究。由于移动速度的存在,传统的基于自相似假设的射流模型并不适用。在考虑到水气掺混过程产生的自由两相湍流特性的基础上,基于涡扩散理论和普朗特混合长度的概念,建立了轴对称水下气体伴随射流的力学数学新模型,给出了伴随射流扩散过程的解析解,由解析解计算的射流边界与实验结果吻合。A theoretical study on the underwater gas jet produced by moving vents is carried out. Due to the existence of moving velocity,the traditional jet model based on self-similar hypothesis is not suitable. In this paper,based on the characteristics of two-phase free turbulence generated in the water-air mixing process,and utilizing the vortex diffusion theory and the concept of Plant mixing length, a new mechanical mathematical model of axisymmetric underwater coherent jet is established,and the analytical solution of the coherent jet diffusion process is given. The jet boundary calculated by the analytical solution is in good agreement with the experimental results.

关 键 词：水下气体射流 涡扩散 伴随射流 自由湍流 

分 类 号：TJ760.1[兵器科学与技术—武器系统与运用工程]