• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

DESIGN AND TRIAL MANUFACTURING OF RAM-ACCELERATOR

Research Project

Project/Area Number 07555679
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Aerospace engineering
Research InstitutionSAITAMA UNIVERSITY

Principal Investigator

OHYAGI Shigeharu  SAITAMA UNIVERSITY ENGINEERING PROFESSOR, 工学部, 教授 (90114818)

Co-Investigator(Kenkyū-buntansha) OBARA Tetsuro  SAITAMA UNIVERSITY ENGINEERING LECTURER, 工学部, 講師 (80241917)
Project Period (FY) 1995 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1997: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1996: ¥700,000 (Direct Cost: ¥700,000)
KeywordsRAM-ACCELERATOR / DETONATION / FREE PISTON / SHOCK WAVES / NUMERICAL SIMULATION / DETAILED CHEMICAL KINETICS / DETONATION REFLECTION / ラムアクセラレーター / 爆轟 / 燃焼機構 / 高速気体力学 / 燃焼学 / 数値シミュレーション / ピストン
Research Abstract

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

Report

(4 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] OHYAGI, S., TANAKA, T., SUZUKI, S. YOSHIHASHI, T.: "A Study of the Initiation Process of Dust Layer Detonation" Shock Wave @ Marselle. IV. 477-488 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] OBARA, T., YAJIMA, S., YOSHIHASHI, T., OHYAGI, S.: "A High-Speed Photographic Study of theTransition from Defragration to Detonation Wave" Shock Waves. Vol.6,No.4. 205-210 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 渡辺 真次, 小原 哲郎, 吉橋 照夫, 大八木 重治: "フィルムデトネーション波開始過程の可視化" 日本機械学会論文集(B編). 63巻612号. 2700-2706 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] OHYAGI,S., TANAKA,T., SUZUKI,S., YOSHIHASHI,T.: "A Study of the Initiation Process of Dust Layr Detonation" Shock Wave @ Marseille. VOl.IV. 477-488 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] OBARA,T., YAJIMA,S., YOSHIHASHI,T., OHYAGI,S.: "A High-Speed Photographic Study of the Transition from Defragration to Detonation Wave" Shock Waves. Vol.6, No.4. 205-210 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] WATANABE,S., OBARA,T., YOSHIHASHI,T., OHYAGI,S.: "Visualizaion of Initiation Processes of Film Detonation Waves (in Japanese)" Trans.JSME (B). Vol.63No.612. 2700-2706 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] OHYAGI,S., TANAKA,T., SUZUKI,S., YOSHIHASHI,T.: "A Study of the Initiation Process of Dust Layer Detonation" Shock Wave @ Marselle. IV. 477-488 (1995)

    • Related Report
      1997 Annual Research Report
  • [Publications] OBARA,T., YAJIMA,S., YOSHIHASHI,T., OHYAGI,S.: "A High-Speed Photographic Study of the Transition from Defragration to Detonation Wave" Shock Waves. Vol.6,No.4. 205-210 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] 渡辺真次、小原哲郎、吉橋照夫、大八木重治: "フィルムデトネーション波開始過程の可視化" 日本機械学会論文集(B編). 63巻612号. 2700-2706 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 中田、小原、吉橋、大八木: "気体デトネーション波のくさびによる反射過程" 第34回燃焼シンポジウム講演論文集. 307-309 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 野平、小原、吉橋、大八木: "ガス爆発による爆風の減衰過程" 第34回燃焼シンポジウム講演論文集. 316-318 (1996)

    • Related Report
      1996 Annual Research Report

URL: 

Published: 1996-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi