2021 Fiscal Year Final Research Report
Laser-induced fluorescence measurement of gas-liquid multiphase diffusion flames in high-pressure rocket combustion
| Project/Area Number |
20K21042
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 24:Aerospace engineering, marine and maritime engineering, and related fields
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
早川 晃弘 東北大学, 流体科学研究所, 准教授 (90709156)
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| Project Period (FY) |
2020-07-30 – 2022-03-31
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| Keywords | OH-PLIF / ロケット燃焼 / 水素燃焼 / 高圧燃焼 / 気液混相燃焼 |
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| Outline of Final Research Achievements |
OH planer-laser-induced fluorescence measurement for gas-liquid multiphase hydrogen combustion at high pressure and high temperature applicable for rocket combustion was developed. OH(2,2) fluorescence band measurements were performed for gas H2/O2 diffusion flames at up to 5.0 MPa, and a clear flame structure with S/N ratio greater than 4 was obtained. OH(2,2) fluorescence band measurement was also applied to the gas-liquid multiphase hydrogen/liquid oxygen combustion at 3.0 MPa, and the flame structure could be observed with S/N ratio of about 2. In combustion experiments of methane/oxygen/nitrogen premixed flames up to 0.5 MPa with oxygen enrichment up to 60%, OH(2,0) band excitation and bi-directional LIF technique were combined for quantitative measurement of OH concentration, and good agreement was obtained with numerical analysis.
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| Free Research Field |
航空宇宙工学，燃焼工学
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| Academic Significance and Societal Importance of the Research Achievements |
ロケット推進系の高性能化，低コスト化に向けて技術開発が続けられているが，ロケット燃焼環境は100気圧，3000Kを超えるような超高圧高温環境であり，現象解明と燃焼数値解析の検証に活用できる計測技術が乏しい．計測技術の中でも平面レーザー誘起蛍光法は，火炎の断面に対してラジカル濃度分布を計測できることから，燃焼数値解析の検証に適しているものの，高圧下でS/Nが大きく低下する課題があった．本研究の成果はその適用範囲を大きく拡張しロケット燃焼技術の開発に貢献することが期待される．
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