环境压强连续变化作用下水下燃气射流数值仿真

王佳雯; 祁晓斌; 王瑞; 李瑞杰; 梁景奇

doi:10.11993/j.issn.2096-3920.202108017

环境压强连续变化作用下水下燃气射流数值仿真

doi: 10.11993/j.issn.2096-3920.202108017

西北机电工程研究所, 陕西咸阳, 712099

详细信息

作者简介:
王佳雯(1988-), 女, 硕士, 工程师, 主要研究方向为水中超空化减阻技术

通讯作者:
祁晓斌(1988-), 男, 硕士, 工程师, 主要研究方向为水下高速射流技术

中图分类号: TJ63; V435
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- 文章访问数: 52
- HTML全文浏览量: 7
- PDF下载量: 14
- 被引次数: 0
出版历程
- 收稿日期: 2021-08-17
- 修回日期: 2021-10-14
- 网络出版日期: 2022-07-29

Numerical Simulation of Underwater Gas Jet Fields with the Continuous Change of Ambient Pressure

Northwest Institute of Mechanical and Electrical Engineering, Xianyang 712099, China

摘要

摘要: 深海反潜导弹在水下航行过程中会经历大幅度的水深变化, 伴随着环境压强的连续变化, 反潜导弹水下固体火箭发动机的水下燃气射流结构与工作特性具有重要的研究意义。文中采用液体体积多相流模型, 结合用户自定义函数和动网格技术, 建立了水下固体火箭发动机轴对称动态模型, 对水下发动机沿垂向运动至250 m水深过程进行数值仿真。仿真结果表明, 在水下运动过程中喷管尾部燃气射流不再出现断裂与回击等现象, 在超音速射流建立过程中, 激波逐步推出喷口, 最终形成位置固定的锥形激波; 在100 m水深以下, 燃气射流流场特性受环境压强的影响较大, 呈现较强的压缩性; 在大航速200 m/s速度航行时, 射流梗阻效应减弱, 使得水下发动机工作性能受到环境压强的作用较小。文中研究可为水下发动机深水垂向运动工作性能提供参考。
- 反潜导弹 /
- 水下固体火箭发动机 /
- 燃气射流 /
- 环境压强 /
- 动网格技术
Abstract: Deep-sea antisubmarine missiles undergo significant changes in water depth during underwater navigation. It is of great importance to study the structure of the gas jet and working characteristics of the underwater solid propellant rocket engine of antisubmarine missiles during continuous changes in environmental depth pressure. Utilizing the volume of fluid (VOF) multiphase model, this study combines the user-defined function (UDF) with the dynamic mesh technique to establish an axisymmetric dynamic model of an underwater solid propellant rocket engine, as well as simulates the process of vertical motion of the underwater engine to a depth of 250 m. The results show that the gas jet no longer breaks and strikes back at the end of the nozzle during underwater motion. During the formation of the supersonic jet, the shock wave is gradually pushed out of the nozzle outlet, and finally, a conical shock wave with a fixed position is formed. Below a depth of 100 m, the flow field characteristics of the gas jet are significantly affected by the ambient pressure, and the flow field structure shows apparent compressibility. At a speed of 200 m/s, the gas jet obstruction effect is weakened, which reduces the effect of the ambient pressure on the working characteristics of the underwater engine. The study of the flow field characteristics of underwater gas jets subjected to continuous changes in ambient pressure can provide a reference for exploring the working performance of underwater engines in deep-water vertical motion.
- antisubmarine missile /
- underwater solid propellant rocket engine /
- gas jet /
- ambient pressure /
- dynamic mesh technique

HTML全文

图 1 计算域和边界条件示意图

Figure 1. Diagram of computational domain and boundary condition

下载: 全尺寸图片幻灯片

图 2 网格分布示意图

Figure 2. Diagram of mesh distribution

下载: 全尺寸图片幻灯片

图 3 射流形貌试验与仿真对比图

Figure 3. Comparison of numerically simulated and experimental results of jet pattern

下载: 全尺寸图片幻灯片

图 4 不同网格密度下喷管出口压力随时间变化曲线

Figure 4. Time-history curves of pressure at nozzle outlet for different mesh density

下载: 全尺寸图片幻灯片

图 5 水下燃气射流初始流场云图

Figure 5. Contours of initial flow field of underwater gas jet

下载: 全尺寸图片幻灯片

图 6 不同水深条件下燃气射流流场云图

Figure 6. Contours of flow field of gas jet at different water depth

下载: 全尺寸图片幻灯片

图 7 燃气泡径向尺度随水深变化曲线

Figure 7. Curves of radial scale of gas bubbles changing with water depth

下载: 全尺寸图片幻灯片

图 8 不同水深条件下燃气空泡相图

Figure 8. Gas cavitation phase diagram at different water depth

下载: 全尺寸图片幻灯片

图 9 不同水深条件下燃气射流中心轴线气动特性分布曲线

Figure 9. Aerodynamic distribution at central axis of gas jet at different water depth

下载: 全尺寸图片幻灯片

图 10 喷管出口截面平均压力随水深变化曲线

Figure 10. Curve of average pressure at nozzle outlet section changing with water depth

下载: 全尺寸图片幻灯片

图 11 喷口燃气流量和速度随水深变化曲线

Figure 11. Curves of gas flow and velocity at nozzle outlet changing with water depth

下载: 全尺寸图片幻灯片

表 1 不同工况的网格数目

Table 1. Number of meshes in different conditions

序号代表意义网格量

A 稀疏网格 20×10⁴
B 标准网格 30×10⁴
C 加密网格 40×10⁴

下载: 导出CSV

参考文献(16)

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