Investigation on the effects of two-dimensional inhomogeneity in the combustion-initiation process of dispersed liquid fuel

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05835
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Thermal engineering
• Research Institution: Kyushu University
• Principal Investigator: Moriue Osamu 九州大学, 工学研究院, 教授 (70363124)
• Research Collaborator: EIGENBROD Christian
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 自着火 / 燃料液滴 / 干渉作用

Outline of Final Research Achievements

This study expands the knowledge of spontaneous ignition of isolated fuel droplets to that of spray through the investigation of effects of droplet interaction. In the spontaneous ignition of most hydrocarbon fuels, two-stage ignition occurs, which is cool-flame appearance and subsequent hot-flame appearance. Two-stage ignition of a droplet pair was observed in microgravity using two interferometers, which enables three-dimensional observation. Cool flame appeared on the outer side of the droplet pair, and hot flame appeared on the inner side. In the spontaneous ignition of a droplet pair with different initial diameters, a smaller droplet promoted ignition normally, though it delayed in the limited conditions like near ignitable limit. Such tendencies were explained through local balance between species transport and chemical reactions.

Free Research Field

燃焼工学，内燃機関工学