水下航行器-发射筒间隙流动仿真

刘元清; 张晨星; 陈香言; 王凡瑜

doi:10.11993/j.issn.2096-3920.202109013

水下航行器-发射筒间隙流动仿真

doi: 10.11993/j.issn.2096-3920.202109013

北京宇航系统工程研究所, 北京, 100071

详细信息

作者简介:
刘元清(1983-), 女, 博士, 高级工程师, 研究方向为水下航行器流体动力学

中图分类号: TJ630.1; U674.941
计量
- 文章访问数: 88
- HTML全文浏览量: 16
- PDF下载量: 25
- 被引次数: 0
出版历程
- 收稿日期: 2021-09-14
- 修回日期: 2021-12-07
- 网络出版日期: 2022-09-06

Simulation of Gap Flow of an Underwater Vehicle-Launch Tube

Beijing Institute of Aerospace System Engineering, Beijing 100071, China

摘要

摘要: 针对水下航行器发射尾部经过气密环时发射筒底与气密腔连通过程, 采用动边界非定常数值仿真, 研究了不同初始压比与航行器运动速度下航行器-发射筒间隙内的流场演化与压力脉动特性。结果表明, 尾部连通初期筒底高温高压气体进入间隙腔的瞬时速度可达音速以上, 气流在冲击远离筒底的气密环后反射并产生剧烈的流动振荡和压力脉动。随着航行器运动, 连通区增加压力脉动幅值下降; 当初始压比增加时, 压力脉动峰值和谷值线性变化, 在初始压比 p_t/p₀=3.0时相对峰值和谷值分别可达1.4倍和0.5倍间隙初始压力; 航行器运动速度增加时泄漏速度增大, 压力脉动峰值增大且出现时间提前; 以上参数下压力脉动周期不变。
- 水下航行器 /
- 发射筒 /
- 气密环 /
- 压力脉动 /
- 间隙
Abstract: When the tail of an undersea vehicle passes through the seal ring, complex characteristics—such as high speed and separation flow—arise during the connection process of the bottom of the launch tube and the seal cavity. Considering these characteristics and using the dynamic boundary unsteady value simulation, the flow field evolution and pressure fluctuation characteristics in the vehicle-tube gap were studied under different initial pressure ratios and vehicle speeds. The results show that the instantaneous speed of the high-temperature and high-pressure gas at the bottom of the tube can exceed the speed of sound when entering the gap cavity in the initial stage of the tail connection. The airflow is reflected after hitting the seal ring away from the bottom of the tube and produces violent flow oscillations and pressure fluctuations. Owing to the movement of the vehicle, the connection area increases and the impact peak amplitude gradually decreases. The amplitude of pressure fluctuation increases linearly with the initial pressure ratio. When the initial pressure ratio is 3.0, the relative peak and valley values of the pressure fluctuation can reach 1.4 times and 0.5 times of the initial pressure, respectively. When the speed of the vehicle increases, the leakage rate and peak pressure increase and the time of occurrence is advanced; meanwhile, the pressure fluctuation period remains unchanged under the above parameters.
- undersea vehicle /
- launch tube /
- seal ring /
- pressure fluctuation /
- gap

HTML全文

图 1 水下航行器与发射筒模型

Figure 1. Models of undersea vehicle and launch tube

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图 2 间隙计算网格对比

Figure 2. Comparison of grids in the gap

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图 3 不同网格数下监测点m8处压力对比

Figure 3. Comparison of pressure at monitoring point m8 under different grid numbers

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图 4 连通后某时刻马赫数对比

Figure 4. Comparison of Mach numbers after connection

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图 5 监测点压力变化

Figure 5. Pressure changes at the monitoring points

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图 6 连通后间隙内不同时刻的马赫数和流线

Figure 6. Mach numbers and streamlines in the gap after connection

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图 7 连通后不同时刻的压力分布云图

Figure 7. Contours of pressure in the gap after connection

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图 8 监测点m8处压力对比

Figure 8. Comparison of pressure at monitoring point m8

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图 9 脉动压力峰值随初始压比变化曲线

Figure 9. The peak value of pulsating pressure with different initial pressure ratio

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图 10 第1个冲击峰值时刻间隙内压力分布

Figure 10. Pressure distribution in the gap at the moment of the first impacting peak

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图 11 连通初期监测点m8处压力对比

Figure 11. Comparison of pressure at monitoring point 8 in the initial stage of connection

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图 12 相同连通距离下间隙内动压对比

Figure 12. Comparison of dynamic pressure in the gap under the same connecting distance

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