2013 Fiscal Year Final Research Report

Combustion of low-calorie gases under low exergy loss conditions: Development of combustors based on the international safety standards

Research Project

Project/Area Number	23560219
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Thermal engineering
Research Institution	Nagaoka University of Technology
Principal Investigator	KADOWAKI Satoshi 長岡技術科学大学, その他の研究科, 教授 (20185888)
Project Period (FY)	2011 – 2013
Keywords	熱工学 / 燃焼診断 / エクセルギー / 安全確認型
Research Abstract	We treated CH4/O2/CO2 mixtures to study the front shape and fluctuation of cellular flames. As the equivalence decreased, the cell width and cell depth became larger, which was due to the high intensity of diffusive-thermal instability. In addition, we performed the time series analysis on the brightness fluctuation. The obtained attractors were similar to the torus, and the trajectory was complicated at low equivalence ratios. Moreover, we performed numerical simulation to study the characteristics of three-dimensional cellular fronts. As the unburned-gas temperature became higher, the growth rate increased. On the other hand, the shape of cellular fronts became smoother, which was due to the weakness of thermal-expansion effects.