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首页> 外文会议>ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress: Proceedings of the ASME Fluids Engineering Division; 20031115-20031121; Washington,DC; US >2-D H-ADAPTIVE FINITE ELEMENT METHOD FOR GAS GUN DESIGN
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2-D H-ADAPTIVE FINITE ELEMENT METHOD FOR GAS GUN DESIGN

机译：气枪设计的二维H自适应有限元方法

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摘要

The Joint Actinide Shock Physics Experimental Research (JASPER) facility utilizes a two-stage light gas gun to conduct equation of state experiments. The gun has a launch tube bore diameter of 28 mm, and is capable of launching projectiles at a velocity of 7.5 km/s using compressed hydrogen as a propellant. A numerical study is conducted to determine the effects that launch tube exit geometry changes have on attitude of the projectile in flight. A comparison of two launch tube exit geometries is considered. The first case is standard muzzle geometry where the wall of the bore and the outer surface of the launch tube form a right angle. The second case includes a beveled transition from the wall of the bore to the outer surface of the launch tube. An h-adaptive, Petrov-Galerkin finite element method is employed to model the axisymmetric compressible flow equations. Numerical solutions indicate that pressure variations occur on the back face of the projectile from case to case.
机译：联合Act系元素激波物理实验研究（JASPER）设施利用两级轻气枪进行状态实验方程。该枪的发射管内径为28毫米，并且能够使用压缩氢气作为推进剂以7.5 km / s的速度发射弹丸。进行了一项数值研究，以确定发射管出口几何形状变化对飞行中弹丸姿态的影响。考虑了两个发射管出口几何形状的比较。第一种情况是标准的枪口几何形状，其中孔的壁和发射管的外表面形成直角。第二种情况包括从孔壁到发射管外表面的斜面过渡。采用h自适应的Petrov-Galerkin有限元方法对轴对称可压缩流方程建模。数值解表明，不同情况下弹丸的背面都会发生压力变化。

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