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兵工学报 ›› 2021, Vol. 42 ›› Issue (12): 2586-2596.doi: 10.3969/j.issn.1000-1093.2021.12.006

• 论文 • 上一篇    下一篇

火箭发动机与尾翼座共用尾翼结构在高膛压火炮膛内间隙影响因素

彭嘉诚, 蒋建伟, 廖伟, 卢易浩   

  1. (北京理工大学 爆炸科学与技术国家重点实验室, 北京 100081)
  • 出版日期:2021-12-31 发布日期:2022-01-15
  • 通讯作者: 蒋建伟(1962—)男,教授,博士生导师 E-mail:bitjjw@bit.edu.cn
  • 作者简介:彭嘉诚(1994—),男,博士研究生。E-mail:3120185175@bit.edu.cn
  • 基金资助:
    国家自然科学基金项目(11872123)

The Factors Affecting the Gap of Common Tail Structure in High-pressure Gun

PENG Jiacheng, JIANG Jianwei, LIAO Wei, LU Yihao   

  1. (State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China)
  • Online:2021-12-31 Published:2022-01-15

摘要: 针对高膛压火炮发射时张开式尾翼座的膛内间隙影响因素及变化规律,基于有限元分析软件LS-DYNA对弹尾采用共用尾翼结构的典型增程类弹药膛内过程开展数值模拟。获得弹丸膛内每时刻的动力学响应,其中出炮口速度、转速与试验数据吻合较好。分析了共同尾翼结构中发动机壳体在不同屈服强度和预紧力加载下膛内发动机支座、壳体与战斗部底座的轴向压缩量及各尾翼片与底座的间隙变化。结果表明:膛内发动机支座、壳体与战斗部底座的轴向压缩量在膛内先增大、后减小,与膛压-时间曲线趋势一致;发动机壳体轴向压缩量对间隙影响最大,在总压缩量中占比达78.2%;发动机壳体屈服强度降低至800 MPa时,共用尾翼结构弹性变形引起的总压缩量已超过尾翼与战斗部底座间隙,导致尾翼片磕碰底座;螺钉预紧力异常加载下各尾翼片与底座的间隙在膛内不再同步,间隙相差最大达初始间隙的17.3%,因此各尾翼片与底座磕碰时产生深浅不一的痕迹。该研究成果可为采用共用尾翼结构的增程类弹药在膛内结构强度故障预防及分析提供参考。

关键词: 高膛压火炮, 共用尾翼结构, 膛内间隙, 屈服强度, 预紧力状态, 数值模拟

Abstract: For the affecting factors and change rules of the gap in open tail seat during the high-pressure gun launch, LS-DYNA software is used to simulate the internal ballistics of a typical extended-range ammunition with a common tail. The dynamic response at every moment in internal ballistics was obtained. The muzzle velocity and rotation speed at the muzzle are in good agreement with the test data. The axial compressions of engine support, engine shell and warhead base, and the change rule of gap between the tail fins and the warhead base under different yield strengths and preloads are analyzed. The results show that the axial compressions of the engine support, shell and warhead base increase first and then decrease, which is consistent with the bore pressure-time variation; the engine shell has a greatest effect on the gap between tail fin and warhead base, and the proportion reaches 78.2% in total compression; when the yield strength of engine shell reduces to 800 MPa, the total compression caused by the elastic deformation of common tail exceeds the gap between tail and warhead base, resulting in collision on the base. When the preloads are abnormal, the gaps between each tail and the base is not synchronized and up to 17.3% of the initial gap, causing the deep and shallow collided marks.

Key words: high-pressuregun, commontail, gapinbore, yieldstrength, preloadstate, numericalsimulation

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