Droplet Evaporation and Ignition Delay Model based on Physical Properties for Low Ignitablity Fuel

2020 Fiscal Year Final Research Report

• Project/Area Number: 18K04588
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 24020:Marine engineering-related
• Research Institution: National Institute of Maritime, Port and Aviation Technology
• Principal Investigator: Takagi Masahide 国立研究開発法人海上・港湾・航空技術研究所, その他部局等, 研究員 (50371092)
• Co-Investigator(Kenkyū-buntansha): 今井 康雄 国立研究開発法人海上・港湾・航空技術研究所, その他部局等, 研究員 (40426218)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 蒸発モデル / 着火性評価 / 舶用燃料

Outline of Final Research Achievements

In this study, a droplet evaporation model and an ignitability evaluation model were developed for a marine fuel modeled as a mixture of alkanes and aromatic hydrocarbons. The purpose of this study is to clarify the relationship between various fuel properties and ignitability index by these models.
The results showed that the model fuels had unimodal and bimodal evaporation characteristics. These differences in evaporation characteristics did not directly affect the ignitability of the model fuels.
A more accurate ignitability evaluation model was developed by modifying the CCAI (Calculated Carbon Aromaticity Index) constants for alkanes and aromatic hydrocarbons, respectively.

Free Research Field

噴霧燃焼工学

Academic Significance and Societal Importance of the Research Achievements

液滴蒸発モデルについては，物質の非理想性と物質輸送と熱輸送のそれぞれに異なるグラスホフ数を用いて重力の効果を考慮するモデルの修正，追加を行った。これにより，通常の重力場での液滴蒸発実験との比較検証が可能になった。
セタン価推定モデルについては，アルカン，芳香族の各成分ごとに修正を行うことで，これまでの着火性指標よりも高精度の定式化を行うことができた。これは，舶用燃料の着火性をより正確に表せる手法に資する結果になっている。