钝体驻定湍流扩散火焰局部熄火的PDF模拟  

PDF Simulation of Local Extinction Within a Bluff-Body Stabilized Turbulent Non-Premixed Flame

作　　者：黄庆[1,2] 朱旻明[2] 叶桃红[2] 陈义良[2] 董刚[3] 

机构地区：[1]中南大学能源科学与工程学院,长沙410083 [2]中国科学技术大学热科学和能源工程系,合肥230027 [3]南京理工大学瞬态物理重点实验室,南京210094

出　　处：《燃烧科学与技术》2009年第4期321-326,共6页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(50506028)

摘　　要：用标量联合的概率密度函数(PDF)方法对钝体驻定的湍流射流扩散Sydney火焰HM3进行数值模拟,速度场用一个修正的LRR-IP雷诺应力模型求解.采用3种不同层次的甲烷反应动力学机理对火焰的宏观结构和熄火特征进行比较研究,并结合当地自适应建表方法加速化学反应计算.结果表明,计算值和实验数据吻合较好,在回流区内,不同反应机理的预测值差别不大,但在"颈部"区域,C2机理相对C1机理可以更准确地模拟标量场的变化和局部熄火现象.The joint-scalar probability density function （PDF） model is used to predict a bluff-body stabilized turbulent non-premixed Sydney flame HM3. A modified LRR-IP Reynolds stress model is applied to obtaining accurate mean flow and turbulent mixing fields. Three different chemical kinetical schemes for methane chemistry are considered to study the macro flame structure and local extinction in flame HM3. The in situ adaptive tabulation （ISAT） technique is applied to incorporating detailed chemistry in an efficient manner. The numerical results and the experimental data are in good agreement. The numerical results indicate that different mechanisms show little difference in their influence on the flames in the recirculation zone, but that C2 chemistry can better predict the scalar field and local extinction than C1 chemistry in the neck zone.

关 键 词：概率密度函数方法 当地自适应建表 钝体驻定扩散火焰 局部熄火 

分 类 号：V231.2[航空宇航科学与技术—航空宇航推进理论与工程] TK121[动力工程及工程热物理—工程热物理]