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针对合成气旋流扩散燃烧开展研究,测量燃烧中间产物OH自由基浓度及火焰温度分布,研究不同燃料和空气旋流强度对合成气旋流火焰的影响。实验结果表明,燃料旋流和空气旋流对合成气旋流扩散燃烧均有重要影响,燃料旋流对火焰结构的影响则更大。随着燃料和空气旋流数的减小,火焰面变薄,不连续的火焰面增多,被卷吸到回流区的OH自由基和高温反应物减少,容易导致燃烧不稳定。在扩张段出口区,温度和OH自由基的浓度分布有较好的对应关系,高OH浓度区域对应温度较高的区域。
Aiming at the swirling diffusion combustion of syngas, the concentration of OH radical in the combustion intermediate and flame temperature distribution were measured to study the influence of different fuels and air swirling intensity on swirling flame of syngas. The experimental results show that both fuel swirl and air swirling have an important influence on swirling diffusion combustion of syngas, and the influence of fuel swirl on flame structure is greater. As the number of swirls of fuel and air decreases, the flames become thinner and the surface of discontinuous flames increases. OH radicals and high temperature reactants entrained in the recirculation zone are reduced, leading to instable combustion. In the exit section of the expansion section, there is a good correspondence between the temperature and the OH radical concentration distribution, and the high OH concentration corresponds to the higher temperature region.