混和性多成分燃料液滴の燃焼における微小爆発現象に関する研究

混相多元燃料液滴燃烧微爆炸现象研究

• 批准号: 09750229
• 负责人: 三上 真人
• 金额: $ 1.34万
• 依托单位: Yamaguchi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Encouragement of Young Scientists (A)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-09750229/
• 关键词: 液滴燃焼; 微小爆発; 多成分燃料; 微粒化; 均質核成分; 確率特性; 噴霧燃焼; 均質核生成; 発生確率

本研究では,単一液滴の微小爆発の発生機構について調べ,微小爆発を利用した液体燃料の二次微粒化過程に対し新たな知見を得ることを目的とした.特に,実用燃料の多成分性に注目し,物性の大きく異なる混和性の二成分から成る燃料を用いて,非接触浮遊の状態で燃焼する液滴を対象として実験を行った.また,均質核生成理論に基づいた微小爆発の確率的発生モデルを提案し,実験結果との比較検討を行った.微小爆発の発生確率の初期液滴直径依存性を調べた結果,初期液滴直径が小さいほど発生確率が低下することが明らかになった.さらに,初期液滴直径が同一でも微小爆発発生時間はばらつくことが実験的に明らかになった.混和性二成分液滴の蒸発期間は,高揮発成分の優先的蒸発期間,加熱期間,準定常的蒸発期間に大別できるが,微小爆発の発生頻度はこの準定常的蒸発期間初期において最大値をとり,時間とともに減少した.この傾向は,均質核生成理論に基づいた微小爆発の確率的発生モデルによりよく説明することができた.これにより,液滴の微小爆発現象は密度ゆらぎによる均質気泡核生成により引き起こされる確率的性質を有する現象であることが示された.また,本モデルをLPG混入軽油を用いた噴霧燃焼に適用し,微小爆発発生の可能性,微粒化能力,今後の課題を示した.本研究により得られた実験結果およびモデルは,混和性多成分燃料の二次微粒化だけでなく気体溶解液体燃料の二次微粒化過程の解析への拡張も可能であり,二次微粒化を利用した噴霧燃焼技術の開発時には重要な役割を果たすことが期待される.

The purpose of this study is to obtain new insights into the mechanism of micro-explosion generation of single droplet and the utilization of micro-explosion in the secondary atomization process of liquid fuel. In particular, the multi-component nature of the fuel is noted, and the physical properties are greatly different. The mixture of the two components is formed. The fuel is used in the non-contact floating state. The droplet is burned. In this paper, the development of the accurate rate of micro-explosion in the basic theory of homogeneous nuclear generation is proposed, and the results are compared and discussed. As a result of adjusting the dependence of the initial droplet diameter on the generation accuracy of micro-explosion, the generation accuracy of micro-explosion decreases as the initial droplet diameter decreases. The initial droplet diameter is the same as the initial droplet diameter, and the time of microexplosion is the same as the initial droplet diameter. The evaporation period of mixed two-component droplets is opposite to the preferential evaporation period of high-volatile components, the heating period, the quasi-steady evaporation period, the occurrence frequency of micro-explosion is opposite to the initial period of quasi-steady evaporation period, and the maximum value of time decreases. This tendency is based on the theory of homogeneous nucleus formation, which explains the occurrence of small explosions. Therefore, the phenomenon of tiny explosions of liquid droplets is due to the precise nature of the formation of homogeneous bubble nuclei due to density differences. In addition, the application of LPG mixed with oil in spray combustion, the possibility of micro explosion generation, the ability to reduce particles, and future problems are indicated. The results obtained in this study indicate that the secondary atomization of mixed multicomponent fuels and the analysis of the secondary atomization of dissolved liquid fuels are possible. The secondary atomization is expected to be important in the development of spray combustion technology.

项目成果

Masato MIKAMI: "Occurrence Probability of Microexplosion in Droplet Combustion of Miscible Binary Fuels" Proceedings of Twenty-Seventh Symposium(International)on Combustion. to be published. (1999)

三上正人：“可混溶二元燃料液滴燃烧中微爆炸的发生概率”第二十七届（国际）燃烧研讨会论文集。

Masato MIKAMI: "Investigation of Stochastic Characteristics in Disruptive Buring of Binary Fuel Droplets" Proceedings of 15th Internal Combustion Engine Symposium(International). (to be published). (1999)

三上正人：“二元燃料液滴破坏性燃烧的随机特性研究”第 15 届内燃机研讨会（国际）论文集。

三上真人: "混合燃料液滴の燃焼における微小爆発の発生について" 日本機械学会論文集(B編). 64巻624号. 324-329 (1998)

Masato Mikami：“关于混合燃料液滴燃烧中微爆炸的发生”，日本机械工程师学会会刊（B 版），第 624 卷，第 324-329 期（1998 年）。

Masato MIKAMI: "The Role of Bubble Nucleation in Secondary Atomizatin of Liquid Mixtures by Microexplosion" Proceedings of The Third Conference of ILASS-Asia. 13-18 (1998)

Masato MIKAMI：“气泡成核在微爆炸液体混合物二次雾化中的作用”ILASS-亚洲第三届会议论文集。

Masato MIKAMI: "Stochastic Approach to Disruptive Burning of Binary Fuel Droplets" Proceedings of Asia-Pacific Conference on Combustion. (to be published). (1999)

Masato MIKAMI：“二元燃料液滴破坏性燃烧的随机方法”亚太燃烧会议论文集。