为分析小口径步枪枪管在热载荷和周边零件作用下热效应对枪管性能的影响，开展枪管表面有无周边零件对枪管温度场和热变形场差异研究。基于初始条件和热边界条件，在有限元分析软件ANSYS中建立高温火药气体热作用下三维枪管及周边零件的热-结构耦合模型。将热电偶固定在枪管表面，并对枪管表面10个位置进行温度测量，实验结果与仿真结果基本吻合。温度场和热变形场仿真结果表明：周边零件与枪管表面直接接触区域存在明显的吸热现象，且枪管温度场受周边零件结构的影响出现不对称性；枪管出现了径向内径增大且沿轴向呈现不均匀增大；枪管出现径向轴心的偏移且沿轴向呈现不均匀偏移。研究与分析热载荷和周边零件影响下枪管热效应可以为后期枪械温度场优化从而实现射击精度的提高奠定基础。
Abstract
In order to study the influence of thermal effect of small caliber rifle barrel on barrel performance under the action of thermal load and surrounding parts, the difference between the temperature field and thermal deformation field of barrel with or without surrounding parts on the barrel surface is studied. Based on the initial conditions and thermal boundary conditions, a three-dimensional thermal-structure coupling model of gun barrel and surrounding parts under the thermal action of high-temperature gunpowder gas is established using finite element analysis software ANSYS. The thermocouple was fixed on the surface of barrel, and the temperatures at 10 positions on the barrel surface were measured. The simulated results are basically consistent with the experimental results. The simulated results of temperature field and thermal deformation field show that there is obvious heat absorption phenomenon in the direct contact area between the surrounding parts and the barrel surface, and the temperature field of barrel is asymmetric due to the structure of the surrounding parts; the radial inner diameter of barrel increases, and expands unevenly along the axial direction; the radial axis of barrel deviates and shows an uneven deviation along the axial direction. The research and analysis of barrel thermal effect under the action of thermal load and surrounding parts can lay a foundation for the later optimization of gun temperature field and the improvement of firing accuracy.
关键词
小口径步枪 /
枪管热效应 /
温度场 /
热变形场
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Key words
smallcaliberrifle /
barrelthermaleffect /
temperaturefield /
thermaldeformationfield
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基金
瞬态冲击技术重点实验室基金项目(6142606193106)
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