【摘要】 将区域法与求目标函数最小值的共轭梯度法结合,进行非灰系统当量灰吸收系数的反演．通过调整供入的热负荷以及炉壁黑度,研究了炉壁黑度和炉气温度变化对反演的当量灰吸收系数的影响．结果表明,炉气温度分布是影响反演的当量灰吸收系数的主要因素,而炉壁黑度对反演的结果影响较小．平均的当量灰吸收系数随炉气温度的升高而减小．在炉子的入口段和出口段,当量灰吸收系数分布随炉气温度变化的规律不同．当量灰吸收系数随炉壁黑度的增加略有减小．更多还原

【Abstract】 Equivalent gray absorption coefficient in non-gray system is calculated by inverse analysis, which combines the zonal method and the method of minimization of a performance function stylizing the conjugated gradient. By varying the loaded heat flux and wall emmisivity, the effect of gas temperature field and wall emmisivity on the equivalent gray absorption coefficient is studied. The results show that gas temperature field is the main effect factor on equivalent gray absorption coefficient, while the influence of wall emmisivity is small. Mean equivalent gray absorption coefficient decreases with the increase of gas temperature. Distributions of equivalent gray absorption coefficient with the change of gas temperature at input and output zones of the furnace are different. Equivalent gray absorption coefficient decreases slightly with the increase of wall emissivity.更多还原