A study on mechanisms triggering combustion instability of curved flame by using laser irradiation method for stable gasturbine combustor

2017 Fiscal Year Final Research Report

• Project/Area Number: 26289042
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Thermal engineering
• Research Institution: Hokkaido University
• Principal Investigator: Fujita Osamu 北海道大学, 工学研究院, 教授 (10183930)
• Research Collaborator: YOON SUNG HWAN 北海道大学, 大学院工学院, DC学生 ; NOH TAEJOON 北海道大学, 大学院工学院, MC学生
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 燃焼 / 予混合火炎 / 音響振動 / 不安定現象 / レーザ / 乱流火炎 / 火炎曲率 / ルイス数

Outline of Final Research Achievements

Freely downward propagating flames in a one end closed combustion tube with diameter of 50mm were investigated as a fundamental of combustion instability in a gas turbine combustor. It was found that some different modes of combustion instability appeared depending on the fuel composition, burning velocity, equivalence ratio, composition of balance gas, and Le. Particularly combustion instability and resulting intense pressure fluctuation were found with presence of coherent corrugated structure at the propagating flame front. Such combustion instability could be caused by combination of primary pressure fluctuation induced by pressure coupling and presence of flame front disturbance.

Free Research Field

熱工学