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DESIGN AND TRIAL MANUFACTURING OF RAM-ACCELERATOR

RAM加速器的设计与试制

基本信息

批准号：
07555679
负责人：
OHYAGI Shigeharu
金额：
$ 0.83万
依托单位：
SAITAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

In this research, a trial experimental apparatus for studying the working mechanism of the ram accelerator has been build. The apparatus is consists of a quick open valve type driver tube, a compression tube with a free piston, a launch tube with a dump tank and an accelerating tube. These tubes are manufactured and assembled. The test run was performed to demonstrate that the driver with the free psiton can accelerate a projectile to a speed larger than 600 m/s.In a ram accelerator, a projectile, is accelerated by the high pressure generated by shock-induced combustion behind the body. To maintain the maximum thrust, detonations must be generated and stabilized at appropriate locations around projectile body. Therefore, successful development of such systems depends on understanding of the detonation structure on the projectile. In this study, a reactive flow around the projectile in the ram accelerator, which is ejected into the acceleration tube at a supersonic speed, is numerically … More simulated to investigate an acceleration process by using detailed chemical reaction models. In formulating the problem, the following assumptions are made. At first, flow field is two dimensional and axisymmetric. Secondly, the flow is inviscid and non-heat-conducting, and the gas is thermally perfect. Thus, the specific heats for all chemical species vary with temperature. Chemical reaction rates of the gas mixture obeys Arrhenius'laws. The mixture through which the projectile is accelerating consists of H2, O2, N2.9 species (H2, O2, H2O,O,H,OH,HO2, H2O2 and N2) and 19 reactions are considered. Under these assumptions, governing equations are formulated as the Euler equation in general coordinates. Computer code used is semi-implicit predictor-corrector TVD scheme to solve the stiff chemistry. A configuration of the projectile is adopted as the RAMAC III benchmark test with its length 80 mm and its maximum radius 7.6 mm. The tube radius is 10 mm, which corresponds to RAMAC facility in Saitama University. Parameter is an initial velocity and an initial pressure in the tube, which contains a premixed of 2 H2+O2+3.76 N2 at 300K.Calculation region is 100 mm _x10 mm and includes grids 331_x 41 around the projectile, 71_x81 behind it. As a result, this computer code is available and captured the detonation structure in detail. And projectile is obtained constant acceleration for each pressure of acceleration tube. Less

本研究建立了冲压加速器工作机理的实验装置。该装置由快开阀式驱动管、带自由活塞的压缩管、带泄放罐的发射管和加速管组成。这些管被制造和组装。进行了测试运行，以证明与自由psiton的驱动程序可以加速弹丸的速度大于600米/秒。在冲压加速器，弹丸，加速由冲击引起的燃烧产生的高压背后的身体。为了保持最大推力，必须在弹体周围的适当位置产生并稳定爆震。因此，这种系统的成功开发取决于对射弹爆炸结构的理解。在这项研究中，数值模拟了冲压加速器中以超音速射入加速管的弹丸周围的反应流， ...更多信息通过使用详细的化学反应模型来模拟研究加速过程。在公式化问题时，做了以下假设。首先，流场为二维轴对称流场。第二，流动是无粘性和非导热的，气体是热理想的。因此，所有化学物质的比热随温度而变化。气体混合物的化学反应速率服从阿累尼乌斯定律。弹丸加速通过的混合物由H2、O2、N2组成。9种物质（H2、O2、H2O、O、H、OH、HO 2、H2 O2和N2）和19种反应被考虑。在这些假设下，将控制方程表示为一般坐标系下的欧拉方程。计算程序采用半隐式预估-校正TVD格式。采用了一种射弹结构作为RAMAC III基准测试，其长度为80 mm，最大半径为7.6 mm。管半径为10 mm，与琦玉大学的RAMAC设施相对应。参数为管内的初速度和初压力，管内含有2 H2+O2+ 3.76N2的预混气体，温度为300 K，计算区域为100mm_x10mm，弹丸周围网格为331_x41，弹丸后方网格为71_x81，计算结果表明，该程序是可行的，能较好地反映爆轰波的结构。对于加速管的每一个压强，弹丸都获得恒定的加速度.少