旋流煤粉燃烧NO生成的AUSM湍流反应模型  

AUSM Turbulence-Chemistry Model for Simulating NO Formation in Swirling Coal Combustion

作　　者：张宇[1] 周力行[1] 张健[1] 

机构地区：[1]清华大学工程力学系煤的清洁燃烧国家重点实验室,北京100084

出　　处：《燃烧科学与技术》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).

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.

关 键 词：煤粉燃烧 NO生成 二阶矩代数模型 

分 类 号：TK16[动力工程及工程热物理—热能工程]