2021 Fiscal Year Final Research Report
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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| 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 |
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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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| Free Research Field |
反応性熱流体力学
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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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