Elucidation of propagation mechanism for gas droplet two phase detonation: estimation based on characteristic lengths and systematic organization of propagation characteristics
| Project/Area Number |
20K22391
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
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| Research Institution | Nagoya University |
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Principal Investigator |
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| Project Period (FY) |
2020-09-11 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Keywords | デトネーション / 気液二相デトネーション / 液滴分裂 / 伝播特性 / 特性長 / 液滴挙動 / 分裂 |
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| Outline of Research at the Start |
数km毎秒という高速で伝播する燃焼現象であるデトネーションは高性能な次世代エンジンへの応用が期待される．しかし，その実用化のための課題である液体燃料または液体酸化剤の使用には気相と液相を含む気液二相デトネーションに対する知見が必須となる．本研究では実験と数値解析の多角的なアプローチを用いて気液二相デトネーションがどのように伝播を継続するかそのメカニズムの解明を行う．また，デトネーションと液滴のパラメータを基にエンジンの設計で必要となる気液二相デトネーションの特性に関する整理を行う．
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| Outline of Final Research Achievements |
Two-dimensional numerical simulations based on Eulerian-Lagrangian method which can produce the behavior of droplets are conducted on gaseous detonation with water droplets with initial diameter distribution to analyze the behavior of detonation propagation and droplets. The main factors to cause the droplet breakup are the transverse wave and the jets regardless of the initial droplet diameter, and the contribution of two factors is affected by the initial droplet diameter. Also, the droplet diameter after the breakup is not uniform depending on the initial droplet diameter, and the accuracy of the prediction of the breakup time and the droplet diameter after the breakup can be enhanced using the average dynamic pressure between the front and the position where the breakup ends. Furthermore, the gaseous detonation with water sprays shows the similar structure to that without water spray from the comparison of characteristic lengths for the gas and droplets in the present conditions.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究の成果により，液滴を含むデトネーションにおいて液滴の分裂が生じる物理機構の理解をより深化させた．そして，液滴の分裂時間や分裂後の液滴直径の予測精度を向上させる本研究の手法は，水液滴を用いたデトネーションの消炎及び被害低減手法の最適化に役立つと考えられる．また，本条件において液滴を含むデトネーションは気相デトネーションと類似した伝播特性を示す事を把握した事は，水液滴を用いたデトネーションの消炎及び被害低減手法に対するモデル化の糸口となる．さらに，本研究で得た知見はデトネーションを用いた高熱効率次世代燃焼器の実用化に向けた課題である液体燃料の使用の解決する事に貢献できる．
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Report
(3 results)
Research Products
(13 results)
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[Presentation] Flight Demonstration of Detonation Engine System Using Sounding Rocket S-520-31: Flight Path and Attitude2021
Author(s)
Hiroaki Watanabe, Koichi Matsuyama, Ken Matsuoka, Akira Kawasaki, Noboru Itouyama, Keisuke Goto, Kazuki Ishihara, Valentin Buyakofu, Tomoyuki Noda, Shiro Ito, Jiro Kasahara, Akiko Matsuo, Ikkoh Funak et al.
Organizer
AIAA Scitech Forum and Exposition 2022
Related Report
Int'l Joint Research
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[Presentation] In-Space Flight Demonstration Results of a Detonation Engine System on Sounding Rocket S-520-31: Flight Path and Attitude2021
Author(s)
Hiroaki Watanabe, Koichi Matsuyama, Ken Matsuoka, Akira Kawasaki, Noboru Itouyama, Keisuke Goto, Kazuki Ishihara, Valentin Buyakofu, Tomoyuki Noda, Shiro Ito, Jiro Kasahara, Akiko Matsuo, Ikkoh Funaki et al.
Organizer
33rd International Symposium on Space Technology and Science
Related Report
Int'l Joint Research
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