二次元バルブレスパルス燃焼器内の燃焼過程の光学的観察

概要

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Optical observations of ignition and burning processes in a two-dimensional valveless pulse combustor are carried out : to examine the phases of termination and initiation of fresh inflows. The acoustic effects of the fresh inflow supply lines on the combustion characteristics, as well as the relationship between the heat release rate and the combustion chamber pressure are clarified. Measurements of mean velocities of air and fuel inflows in three typical phase durations are also attempted using the Schlieren optical system. It is found that the air flow terminates almost simultaneously with the fuel inflow, while the former initiates earlier than the latter by about a 1/4 period, suggesting a dominant acoustic effect of the upstream supply lines on the pulse combustion mechanism. The velocity of fresh inflow at the point just downstream of the baffle plate, which reaches up to 17 m/s, is high enough to enhance mixing and burning within a pair of large eddies. The fluctuation of the overall heat release rate is advanced in phase by about a 1/4 period ahead of the pressure fluctuation. Therefore, it is understood that a relatively small amount of energy is added to the present pulse combustion system to maintain stable pulsation.
一般社団法人日本機械学会の論文
1997-09-25