水素微小球状伝ぱ層流火炎の基礎燃焼速度特性(熱工学,内燃機関,動力など)

概要

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Comprehension of the burning velocity for micro-scale flames is inevitable in the improved design of micro-combustors for miniaturized power supplies, and also useful for modeling local burning characteristics of turbulent flames. The present study is performed to examine experimentally the burning velocity characteristics of lean hydrogen-premixed micro-scale spherical laminar flames in the range of flame radius γ_f approximately from 1 to 5mm, and also macro-scale laminar flames with γ_f>7mm for comparison. The mixtures have nearly the same laminar burning velocity at socalled unstretched flames and different equivalence ratio φ which is varied from 0.3 to 0.9. The radius 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 velocity of micro-scale flames with φ=0.3 and 0.5 has a tendency to decrease with increasing γ_f and approach that of macro-scale flames, but such a trend can not be seen for φ0.9 micro-scale flames. This suggests that burning velocity characteristics of micro-scale flames can not be always explained based on that of macro-scale flames. In the micro-scale flames, the optimum size and stretch of flames to improve the burning velocity are also found to exist, depending on φ.
社団法人日本機械学会の論文
2006-12-25