Formulation of dispersed phase combustion physics for aero engine: from low-pressure combustion in high-altitute relight operation to high-pressure combustion in steady operation of engine

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H04201
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Aerospace engineering
• Research Institution: Yamaguchi University
• Principal Investigator: Mikami Masato 山口大学, 大学院創成科学研究科, 教授 (20274178)
• Co-Investigator(Kenkyū-buntansha): 瀬尾 健彦 山口大学, 大学院創成科学研究科, 准教授 (00432526)
• Co-Investigator(Renkei-kenkyūsha): KIKUCHI Masao 宇宙航空研究開発機構, 有人宇宙部門, 研究員 (80371144) ; NOMURA Hiroshi 日本大学, 生産工学部, 教授 (30246847)
• Research Collaborator: SAPUTRO Herman ; SANO Narita ; MOTOMATSU Naoya ; YOSHIDA Yasuko ; IWAI Kentaro ; NAGATA Kentaro ; UNEYAMA Ryo
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 燃焼 / 液滴群 / 燃え広がり / 群燃焼 / 高圧

Outline of Final Research Achievements

This research conducted microgravity experiments of flame spread over
droplet-cloud elements and randomly distributed droplet clouds in a wide pressure range in order to improve understanding of the flame spread and group-combustion excitation in fuel sprays under high-altitude relight condition of aero engines. The experiments elucidated the effects of droplet diameter ratio, local droplet interaction and ambient pressure. The results show that the thermal conduction from a burning droplet to the next unburned droplet plays an important role and the burning lifetime of the base droplet controls the flame-spread limit. Anomalous flame-spread behavior was observed over 1.5 MPa and near the group-combustion-excitation limit in randomly distributed droplet clouds. These phenomena should be elucidated in future researches.

Free Research Field

燃焼学