F101 A Study on Burning Velocity Characteristics of Hydrocarbon Premixed Micro-scale Spherical Laminar Flames

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  • F101 炭化水素混合気の微小球状伝ぱ層流火炎の燃焼速度特性に関する研究(OS1 マイクロエネルギー変換),動力エネルギーシステム部門20周年,次の20年への新展開)

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This study is performed to examine experimental the burning velocity characteristics of hydrocarbon-premixed micro-scale spherical laminar flames with the flame radius r_f<approximately 5 mm, and also macro-scale laminar flames with r_f>7 mm for comparison, where methane or propane is used as hydrocarbon. The mixtures have nearly the same laminar burning velocity and different equivalence ratio φ(φ=0.8〜1.0 for methane mixtures, φ=0.8〜1.2 for propane mixtures). The radius, stretch and the burning. velocity of micro-scale flames are obtained by using sequential schlieren images recorded under appropriate ignition conditions. The results show that the burning velocities of micro-scale flames have tendency to increase with increasing r_f or decreasing the Karlovitz number and approach that of macro-scale flames. However, dependence on φ shows to be the difference between methane and propane mixtures.

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