摘要
针对煤粉燃烧NO生成提出一种湍流反应统一二阶矩代数(AUSM)模型.用纯双流体模型,包括k ε kp两相湍流模型、EBU Arrhenius燃烧模型、六热流辐射模型、NO生成湍流反应的AUSM模型和原有二阶矩代数模型,对旋流煤粉燃烧器内相流动、煤粉燃烧和NO生成进行了数值模拟.两相流动的模拟结果和PDPA实验结果符合较好.热态模拟结果和文献中的实验结果的对照指出,AUSM模型的模拟结果比ASM模型的模拟结果更合理.ASM模型由于采用温度指数函数的级数展开近似,舍去了并非小量级的高阶项,低估了NO生成率.这和文献中用ASM模型模拟甲烷 空气燃烧低估了NO生成率的趋势是一致的.
An algebraic unified second-order moment (AUSM) turbulence-chemistry model was proposed for simulating NO formation during coal combustion. A full two-fluid model together with the κ-Ε-κp two-phase turbulence model, the EBU-Arrhenius combustion model, the six-flux radiation model and two different turbulence-chemistry models of NO formation were used to simulate gas-particle flows, coal combustion and NO formation in a swirl burner. The predicted two-phase flow results are in good agreement with the PDPA (phase-Doppler particle anemometer) measurement results. Comparison of predicted combustion results with experiments indicates that the AUSM model is more reasonable than the original ASM model, which under-predicts the NO formation rate due to the approximation made in series expansion of the exponential function of temperature. So does the simulation of NO formation during methane-air combustion by using the original ASM model reported in other documents.
出处
《燃烧科学与技术》
EI
CAS
CSCD
2003年第3期209-213,共5页
Journal of Combustion Science and Technology
基金
国家重点基础研究专项经费资助项目(G1999 0222 07).
关键词
煤粉燃烧
NO生成
二阶矩代数模型
Coal dust
Computational fluid dynamics
Computer simulation
Mathematical models
Nitrogen oxides
Turbulent flow
Two phase flow
