基于DES模型圆柱弹丸水中绕流特性仿真

张弛宇; 郭 锐; 刘 敏; 刘荣忠; 周 昊; 陈 亮

doi:10.11993/j.issn.1673-1948.2016.05.009

基于DES模型圆柱弹丸水中绕流特性仿真

doi: 10.11993/j.issn.1673-1948.2016.05.009

1.
南京理工大学机械工程学院, 江苏南京, 210094
2.
陆军西安军事代表局, 陕西西安, 710032

基金项目: 高等学校博士学科点专项科研基金(20133219110019)

详细信息

作者简介:
张弛宇(1991-), 男, 在读硕士, 研究方向为弹药精确化与智能化.

中图分类号: TJ630; TJ410.33
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- 被引次数: 0
出版历程
- 收稿日期: 2016-07-26
- 修回日期: 2016-08-25
- 刊出日期: 2016-10-20

Simulation on Flow around Cylindrical Projectile in Water Based on DES model

1.
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
2.
Army Military Representative Office, Xi′an 710032, China

摘要

摘要: 圆柱型装药是水下战斗部的主要形式, 文中基于Fluent软件, 采用分离涡模拟(DES)方法对处于高雷诺数下圆柱弹丸进行了二维水中绕流仿真, 重点研究了25 m/s来流速度下圆形弹丸水中绕流特性, 得到了升力系数、阻力系数以及斯特劳哈尔数。通过仿真得到了周期性交替脱落的卡门涡街结构, 分析了流场在不同截面时均速度规律, 以及圆柱周向时均稳态压力系数, 其图像规律也与已知大湍涡模拟(LES)方法高度吻合。通过对不同来速下弹丸阻力系数和斯特劳哈尔数的分析, 结果表明, 随着来流速度增大, 阻力系数减少, 圆柱弹丸在水中运动所受的阻力减小, 而斯特劳哈尔数增大意味圆柱弹丸两侧涡脱落的频率增大, 当涡脱落频率与物体固有频率接近时, 会引起共振, 造成弹的损伤。文中的研究可为水下战斗部弹丸设计提供参考。
- 水下战斗部 /
- 圆形弹丸绕流 /
- 分离涡模拟(DES)湍流模型 /
- 高雷诺数 /
- 卡门涡街
Abstract: Based on the software Fluent, the flow around a cylindrical projectile in water with high Reynolds number is simulated by using the detached eddy simulation(DES) method. The flow characteristics of the cylindrical projectile are analyzed at the flow rate of 25 m/s, and the lift coefficient, the drag coefficient and the Strouhal number, as well as the periodic alternatively shed Karmen vortex structure, are obtained. The mean velocity of flow field in different cross section and the mean steady pressure coefficient at cylinder circumference are analyzed. The image law is well consistent with that from the known large eddy simulation(LES) method. Further, the projectile drag coefficient and the Strouhal number at different speeds are analyzed, and the results show that with the increase in flow rate, the drag coefficient and the drag against the cylindrical projectile moving in water decrease, while the Strouhal number increases, inferring higher frequency of vortex shedding at both sides of the cylindrical projectile. When the vortex shedding frequency is close to the natural frequency of the projectile, resonance will occur to harm the projectile. This research may provide reference for design of projectile in underwater weapon warhead.
- underwater warhead /
- flow around cylindrical projectile /
- detached eddy simulation(DES) /
- high Reynolds number /
- Karman vortex street

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参考文献(10)

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