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设计了一种隐式迭代方法求解颗粒能量方程,采用离散坐标方法计算炉膛内的辐射传热,完整地考虑颗粒能量方程中的辐射项。与常规差分方法的对比表明:采用隐式迭代方法可以稳定颗粒相的计算,加速颗粒能量方程的收敛速度。为了考察颗粒辐射项对燃烧模拟的影响,分析了计入颗粒辐射项前后颗粒燃烧过程和全场燃烧模拟结果的差别。结果表明:计入颗粒辐射项后,颗粒的燃尽时间增长,颗粒辐射份额在颗粒燃尽后占颗粒整体传热的50%左右;炉膛火焰峰面等高温区气相温度有所上升,屏区和低温壁面附近的气相温度有所下降。实验对比表明考虑辐射项后,使得模拟结果向实验值趋近。
An implicit iterative method was proposed to solve the particle energy equation. The discrete coordinate method was used to calculate the radiative heat transfer in the furnace. The radiation term in the particle energy equation was completely considered. The comparison with the conventional differential method shows that the implicit iterative method can stabilize the calculation of the particle phase and accelerate the convergence rate of the particle energy equation. In order to investigate the effect of particle radiation on the combustion simulation, the differences between the particle combustion process and the full-scale combustion simulation before and after the inclusion of particle radiation were analyzed. The results show that the burnout time of particles increases with the particle radiation, and the proportion of particle radiation accounts for about 50% of the total heat transfer of the particles after the particles burn out. The temperature of the gas phase in the high temperature zone such as the furnace flame surface increases, And the temperature of the gas phase near the low temperature wall decreased. Experimental comparison shows that after considering the radiation term, the simulation result is approached to the experimental value.