旋流燃烧室内煤粉燃烧的数值模拟

为合理描述煤粉颗粒在有湍流脉动的气相流场与温度场中的燃烧反应行为，文中提出并建立了考虑湍流-颗粒反应相互作用的颗粒随机轨道模型。该模型考虑到了气相温度的湍流脉动对颗粒瞬时温度、瞬时热解速率和瞬时多相反应速率的影响。应用此模型对有直流一次风和旋流二次风的旋流燃烧室内的煤粉燃烧进行了数值模拟。计算结果表明，在燃烧室前部区域，该模型与未考虑湍流?颗粒反应相互作用的颗粒随机轨道模型给出的气相温度场与组分浓度场结果有一定的差异，前者得到的气相温度分布与实验更接近。

Simulation of Pulverized Coal Combustion in a Swirl Combustor

For properly describing the reactive behaviors of pulverized coal particles in turbulent gas flows with velocity and temperature fluctuations, a particle stochastic trajectory model for turbulence-particle reaction interactions is proposed and formulated. The model accounts for the effects of turbulent fluctuation of gas temperature on the particle instantaneous temperature, devolatilization rate, and heterogeneous reaction rate. It is applied to the numerical simulation of pulverized coal combustion in a swirl combustor with non-swirling primary air and swirling secondary air. The calculated distributions of gas temperature and species concentrations by this model are different from those obtained by the particle stochastic trajectory model without turbulence- particle reaction interactions in the upstream region of the combustor. The former are closer to the measured data than the later in terms of the gas temperature distribution.