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STUDY ON THE COMBUSTION IN RAM ACCELERATOR

RAM加速器燃烧研究

基本信息

批准号：
06452346
负责人：
TAKI Shiro
金额：
$ 4.29万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06452346/
关键词：
Supersonic Combustion Ram Accelerator Shock Wavc Propulsion SCRAM Jet Detonation

项目摘要

Ram acceletator is recently begun to study expecting the possibility to use as the economic launcher of space vehicles, for the projectile can be launched with very high speed without booster rocket motor. It is also expected as the fundamental experimental apparatus to study on the supersonic combustion. In the present reserch project we made a small ram accelerator, which allowa us optically to observe the burning flow fields in order to get its fundamental data, for we considered as the understanding level on the ram accelerator is not ready for its practical use. We have been tried to make it work as a ram accelerator, when initial velocity of the projectile is not so high and when initial pressure is not so high as other ram accelerators in the world. We have also developed a computer program to simulate numerically the burning flow field around the projectile in order to help our development of the ram accelerator by comparing with our experimental results.The development of our … More ram accelerator is started by that of a light gas gun to give the projectile enough initial speed. The light gas gun we developed is driven by gaseous detonation, which is easy to get high pressure. The next parts of the ram accelerator we developed are the apparatus to break a sabot and to evacuat the driver gas from the tube. As a result of these developments, the projectile can travel satisfying the conditions to start. It is cleared that the range of starting conditions is very narrow to get stable combustion. There is a lower limit of initial speed, which depends on the pressure and the composition of the gas mixture as well as the size of the sabot to ignite. As there are so many parameters to run the ram accelerator, we could not complete to decide the range of its starting conditions up to now. The numerical simulatios help us to do experiments on these starting conditions. We have to solve the burning high speed gas flow around the projectile and the sabot to ignite, which move independently each other, to simulate the initial unsteady starting processes. We got the numerical solutions in qualitative agreement with the experiments, using the solution adaptive multilevel grid refinement method and the moving boundary technique. Less

冲压加速度计是最近开始研究的，希望作为空间飞行器的经济发射器，因为这种弹丸可以在没有助推器火箭发动机的情况下以非常高的速度发射。也有望成为研究超音速燃烧的基础实验装置。在本研究项目中，我们制作了一台小型冲压加速器，使我们能够对燃烧流场进行光学观察，以获得其基础数据，因为我们认为对冲压加速器的认识水平还不足以用于实际应用。当弹丸的初始速度不是那么高，当初始压力不像世界上其他的冲压加速器那样高的时候，我们已经尝试使它作为冲压加速器工作。为了给冲压加速器的研制提供帮助，我们还编制了数值模拟弹丸周围燃烧流场的计算机程序。…的研制更多的冲压加速器是由轻气炮启动的，以使弹丸有足够的初始速度。我们研制的轻气炮采用气态爆轰驱动，容易产生高压。我们开发的冲压加速器的下一个部件是用来打破弹托和从管子里抽出驱动气体的装置。作为这些发展的结果，炮弹可以在满足启动条件的情况下飞行。研究表明，要获得稳定燃烧，启动条件的范围很窄。初始速度有一个下限，这取决于混合气体的压力和组成，以及要点燃的弹托的大小。由于运行冲压加速器的参数太多，到目前为止，我们还无法完成对其启动条件范围的确定。数值模拟有助于我们在这些启动条件下进行实验。为了模拟起爆初期的非定常起爆过程，必须对弹丸周围燃烧的高速气流和弹托相互独立运动的弹托进行求解。采用解自适应多级网格加密方法和动边界技术，得到了与实验定性一致的数值解。较少