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首页> 外文期刊>Combustion Science and Technology >MODELING OF LIFTED METHANE JET FLAMES IN A VITIATED COFLOW USING A NEW FLAME EXTINCTION MODEL
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MODELING OF LIFTED METHANE JET FLAMES IN A VITIATED COFLOW USING A NEW FLAME EXTINCTION MODEL

机译：用新的消焰模型模拟通风气流中的甲烷气急流火焰

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摘要

In this article, flame liftoff height predictions have been carried out for diluted methane jet flames with high temperature and vitiated coflow. Three-dimensional mass, momentum, energy, and species equations are solved with modified k-ε and modified k-ω turbulence models to predict the behavior of lifted jet flames. The effect of turbulence model parameters, fuel jet velocity and coflow velocity has been investigated for jet flames. The flame is assumed to be quenched when the fluid time scale is less than the chemical time scale (Da = τη τ_(ch) < 1). The predicted results show that substantial premixing of fuel occurs with surrounding oxidizer in axial and radial directions. Predicted flame liftoff height agrees well with the experimental measurements at 100 mls jet velocity and it is significantly higher than the predictions reported in earlier work. However, predicted variation of flame liftoff height with jet velocity agrees well with Kalghatgi's (1984) nondimensional parameters. The flame liftoff height, temperature distribution, species distribution, and velocity distributions in radial and axial directions are in good agreement with the experimental results.
机译：在本文中，已经对具有高温和通风顺流的稀释甲烷喷射火焰进行了火焰剥离高度预测。使用修正的k-ε和修正的k-ω湍流模型求解三维质量，动量，能量和物质方程，以预测喷射的火焰的行为。研究了湍流模型参数，燃料喷射速度和并流速度对喷射火焰的影响。当流体时间标度小于化学时间标度（Da =τητ_（ch）<1）时，假定火焰被熄灭。预测结果表明，燃料与周围的氧化剂在轴向和径向发生了充分的预混合。预测的火焰剥离高度与100 mls喷射速度下的实验测量值非常吻合，并且大大高于早期工作中报道的预测值。然而，预测的火焰上升高度随射流速度的变化与Kalghatgi（1984）的无量纲参数非常吻合。火焰升空高度，温度分布，物种分布以及径向和轴向速度分布与实验结果吻合良好。

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