1997 Fiscal Year Final Research Report Summary
Development of a small-sized ram accelerator for improving the muzzle velocity
| Project/Area Number |
08555239
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Aerospace engineering
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| Research Institution | INSTITUTE OF FLUID SCIENCE,TOHOKU UNIVERSITY |
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Principal Investigator |
SASOH Akihiro Institute of Fluid Science, Tohoku University, Associate professor, 流体科学研究所, 助教授 (40215752)
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| Co-Investigator(Kenkyū-buntansha) |
KATO Yukio Japan Oil and Fat Co.Ltd., Supervisor, 部長(研究職)
TAKAYAMA Kazuyoshi Institute of Fluid Science, Tohoku University, Professor, 流体科学研究所, 教授 (40006193)
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| Project Period (FY) |
1996 – 1997
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| Keywords | Ram Accelerator / Shock Wave / Chemical Reaction / Detonation |
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| Research Abstract |
In this study, the scaling effects were analyzed by conducting quasi-one-dimensional numerical simulation with finite-rate chemical reactions being taken into account. From the numerical simulation, it was concluded that in order to obtain a wide operation regime in the thermally-choked operation mode, small-sized apparatus was favorable. Based on this, a small sized ram accelerator was constructed and its operation tests were conducted. It was found that the smaller the apparatus the more difficult its starting became. In order to better understand the starting process, flow visualization experiments were conducted. The behavior of a precursory shock wave was visualized by using a high-speed image converter camera. Density field around a projectile impinging the diaphragm at the ram acceleration tube entrance was visualized by holographic interferometry, concluding that the existing diaphragm rupture model was inadequate in quantitative numerical simulation. By varying mixture components, fill pressure, powder mass, projectile configuration, sabot configuration and the initial pressure in the pre-acceleration section, ram acceleration experiments were done, obtaining a velocity gain of 370 m/s.
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