| Project/Area Number |
21K14085
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 19020:Thermal engineering-related
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| Research Institution | Tohoku University |
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Principal Investigator |
COLSON Sophie 東北大学, 流体科学研究所, 特任助教 (60898386)
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| Project Period (FY) |
2021-04-01 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Keywords | liquid ammonia / spray combustion / flash-boiling spray / spray modeling / spray characteristics / model validation / heat transfer |
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| Outline of Research at the Start |
Ammonia is a promising carbon-free fuel. However, liquid ammonia spray combustion remains merely investigated. It is thus crucial to clarify the fundamental combustion physics of ammonia spray in a simple environment to enable the development industrial applications. This study thus aims at the observation of the ammonia spray flame through both experiment and numerical simulation. The spray characteristics (span, droplet size, distribution and velocity) will be first investigated and modeled in cold case before investing the combustion case and flame-spray interactions.
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| Outline of Final Research Achievements |
During this research project, the characteristics of liquid ammonia sprays were investigated, and a dataset of experimental results was obtained for the validation of the numerical modeling of the spray. The effects of the change in the injection conditions (temperature and geometry) on the spray patterns were clarified. The conditions leading to the transition to flash-boiling (sudden evaporation occurring when a liquid is discharged in an environment below its saturation pressure, leading to fine atomization) for liquid ammonia were investigated. Combustion experiments were also performed to relate the effect of the change in the injection conditions, the spray patterns, and the flame stabilization, providing some insights for the design of injection nozzles for industrial applications.
The results of this research project were also communicated at an international conference and in a peer-review journal (Fuel, IF: 6.6) paper.
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| Academic Significance and Societal Importance of the Research Achievements |
The present research is expected to contribute to the development of accurate numerical models necessary for the design of efficient, low-emission industrial burners. It also provides valuable information on geometry which can be used as guidelines for the design of nozzles for liquid ammonia.
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