ステップ後流において燃料噴射した場合の保炎実験

概要

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The blow-off velocity of a flame stabilized in recirculating flow of a backward-facing step in a two-dimensional air duct is obtained experimentally. The fuel injection slit is located at the down-stream of the step whose heights are 0, 10 and 20mm. The fuels employed are methane, propane, hydrogen and city gas, and the air velocity can be changed from 1 to 60m/sec. The results show that the backward-facing step extends the blow-off velocity with increase in the velocity of fuel, and that this effect is more remarkable in the higher step height. The blow-off velocity nondimensionalized by the burning velocity can be expressed in a uniform manner, i. e., independent of fuel, by the heat release flux. Furthermore, it is ascertained experimentally that heat loss across the combustor wall apparently does not influence the blow-off velocity in this configuration. Also, the velocity fields are measured by LDV.
社団法人日本機械学会の論文
1992-01-25