摘要
燃气热因素和燃气动力作用是造成火炮身管内膛烧蚀直径扩大的主要因素。在弹丸发射过程中存在着高温、高压、高速的火药燃气,使得身管内壁表面不断形成熔化层,溶化层在高速气流的作用下被带走,从而使得身管径向不断扩大。基于这样的假设提出了一种新的预测身管烧蚀寿命的方法。通过利用内弹道学和热传导理论给出了计算熔化层厚度的积分方程、内膛传热的边界条件和液固界面的温度梯度积分方程,并给出了方程的一般计算方法。最后应用半无限大物体假设给出了熔化层厚度的一种近似计算公式。
The thermodynamic factor and kinetic factor of combustion gas are the main factors that lead to the results of barrel＇s wear and erosion onto inner rifle and the enlargement of inner diameter. There is high-temperature, high-pressure and high-velocity powder combustion gas existed in the process of gun firing. This forms a melting layer on the inner surface of the gun barrel. The melting layer is taken away by high-speed airflow, this makes the inner diameter of gun tube enlarge. Based on this assumption, a new method used to predict wear and erosion life of gun barrel was proposed. By use of theories of interior ballistics and thermal exchange, the integral equations for computing the thickness of melting layer, boundary conditions of thermal exchange on the inner rifle, and temperature gradient integral equations of the solid-hydraulic interface were given. And thus the general method for computing the thickness of melting layer was also given. Finally, the semi-infinite body assumption was used to deduce the approximation formula for computing the thickness of melting layer.
出处
《火炮发射与控制学报》
北大核心
2009年第2期5-8,共4页
Journal of Gun Launch & Control
关键词
热学
身管寿命
烧蚀机理
溶化层
传热
thermology
barrel life
erosion mechanism
melting layer
thermal exchange
