Abstract
In practical combustors such as gas turbine engine and jet engine, these combustions are performed under high pressure. High-pressure combustion has a merit to achieve high load combustion that means high heat value per unit volume. In addition, pure oxygen combustion has a merit to attain high flame temperature with no NO_x mission. However, studies on combustion mechanism of flame under high pressure have not been reported sufficiently. Especially, almost no studies on pure oxygen combustion under high pressure have been reported so far. In the present study, we targeted methane-pure oxygen nonpremixed flames under high pressure and examined the spectrum of flame luminescence by using Multi-Color Integrated Cassegrain Receiving Optics (MICRO) system. It is found that, under atmospheric pressure, color of the flame is indigo caused by line spectrum of CH^* radical (430nm) and that, under high pressure, line spectrum of CH^* is disappeared and color of the flame become white caused by band spectrum of CO-O^* radical (350〜500nm).
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