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为增强燃烧的稳定性,提出了利用等离子体旋流器调控燃烧的新概念。等离子体旋流器由多对交错布置在燃烧器扩张段或喷嘴出口段上的电极组成,通过电离空气产生活性自由基,同时能够促进空气旋流,从而起到促进燃烧和增强燃烧稳定性作用。实验中利用平面激光诱导荧光测试系统观测到随着等离子激励功率的增强,火焰反应区逐步变宽,燃烧反应更加完全、稳定,研究表明,等离子体旋流器设计思路可行。分析了等离子体旋流器的优点,通过数值模拟研究了等离子体旋流器作用下的流场特点,将等离子体旋流器的作用机理归纳为旋流效应、化学效应和热效应。
In order to enhance the stability of combustion, a new concept of using plasma cyclone to control combustion is proposed. The plasma cyclone is composed of a plurality of pairs of electrodes alternately arranged on the burner expansion section or the nozzle outlet section to generate active radicals by ionizing air and at the same time to promote the swirling of the air so as to promote the combustion and enhance the combustion stability . In the experiment, the planar laser-induced fluorescence test system was used to observe that as the plasma excitation power is increased, the flame reaction zone gradually widens and the combustion reaction is more complete and stable. The research shows that the design of the plasma cyclone is feasible. The advantages of the plasma cyclone were analyzed. The characteristics of the flow field under the action of the plasma cyclone were studied by numerical simulation. The action mechanism of the plasma cyclone was summarized as cyclone effect, chemical effect and thermal effect.