Clarification of extinction mechanisms of premixed flames by high-concentration water mist

2020 Fiscal Year Final Research Report

• Project/Area Number: 17K06202
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Thermal engineering
• Research Institution: Akita Prefectural University
• Principal Investigator: Ogami Yasuhiro 秋田県立大学, システム科学技術学部, 准教授 (00375122)
• Co-Investigator(Kenkyū-buntansha): 杉本 尚哉 秋田県立大学, システム科学技術学部, 教授 (20291784) ; 鶴田 俊 秋田県立大学, システム科学技術学部, 教授 (90197773)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Keywords: 水ミスト / 予混合火炎 / 平均粒径

Outline of Final Research Achievements

Effects of the mean droplet diameter of water mist on the burning velocities were investigated experimentally.
The burning velocities of water-mist-added CH4/air premixed flames were obtained by the angle method for various conditions of the water mist mass fraction. The mean droplet diameters were controlled by changing the mixture-gas flow rate. The experimental results of burning velocities were compared between each condition of the mean droplet diameter. It was found that the burning velocities with the large mean droplet diameter of water mist became faster than those for the small mean droplet diameter, and the experimental data of burning velocities had the similar trends to previous analytical results for the mono-disperse water mist.

Free Research Field

燃焼工学

Academic Significance and Societal Importance of the Research Achievements

水ミストの粒径の違いが予混合火炎の抑制，消炎に及ぼす影響については，単一粒径水ミストに関して解析的および数値計算的な研究がいくつかおこなわれてきた．しかしながら，解析結果を裏付ける実験結果については，十分であるとは言えない状況である．本研究では，限定的ではあるが粒径を変化させた実験を行うことができたが，これは解析解や数値計算結果を検証する上で極めて有意義なデータである．