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采用有限差分方法对不同工况下三维旋流液雾燃烧进行了直接数值模拟,其中液滴的跟踪在拉格朗日框架中进行,液滴的蒸发相变采用无限热传导蒸发模型描述,气相燃烧采用自适应单步反应机理,模拟中采用的模型燃烧器尽可能逼近真实的燃气轮机旋流燃烧器。结果发现,旋流液雾燃烧流动和火焰结构受到旋流方式和当量比的影响,流场中出现了反平行排列的涡管结构,且各种工况下液雾燃烧火焰都是由贫燃预混火焰、富燃预混火焰、扩散火焰构成。这些给液雾燃烧的模型模拟带来了新的挑战。
The finite difference method was used to directly simulate the three-dimensional vortex liquid mist combustion under different conditions. The droplet tracking was carried out in the Lagrangian framework. The evaporation phase transformation of the droplets was described by the infinite heat conduction evaporation model. The gas phase combustion Using an adaptive single-step reaction mechanism, the model burners used in the simulation are as close as possible to the actual gas turbine swirl burners. The results show that the swirl flow and flame structure of the swirling liquid are affected by the swirling flow and equivalence ratio, and the vortex tube structure is antiparallel arranged in the flow field, and the liquid mist combustion flame is composed of lean burn Pre-mixed flame, rich combustion premixed flame, diffusion flame composition. These model simulations of liquid-vapor fogging present new challenges.