同轴旋转分层流燃烧器空气动力场的数值模拟  

Numerical simulation on air dynamic field in co-axial swirling stratified flow burner

作　　者：吴江[1] 陈启峰[1] 章明川[1] 范卫东[1] 高茂[1] 尹斌[1] 

机构地区：[1]上海交通大学机械与动力工程学院

出　　处：《水动力学研究与进展（A辑）》2004年第2期213-218,共6页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(59876019);国家重点基础研究规划项目(G1999022209 04)

摘　　要：　同轴旋转分层流燃烧器运用离心力分层原理,对一、二次风混合进行有效控制,达到分级燃烧,抑制NOx生成的目的。由于离心力的作用,同轴旋转分层流燃烧器的湍流脉动是各向异性的,这使得基于各向同性假设的k ε模型不再适用。本文运用作者提出的考虑离心力影响的k ε模型(k ε cf模型),对流项采用混合差分格式,对同轴旋转分层流燃烧器空气动力特性进行了数值模拟,将数值预报与实验测定进行了比较,得到了较好的结果。The mechanism of stratification of centrifugal force is applied to a co-axial swirling stratified flow burner to control effectively the mixture between the primary and secondary air so as to attain staged combustion to prohibit yield of NO_x. Due to centrifugal force, air dynamic field in the burner is anisotropy, which makes k-ε taking model based on the hypothesis that a flow field is isotropic not suitable. k-ε-cf model proposed by the authors, a modified k-ε model taking centrifugal force into account, has been used in the present paper. Air dynamic field in a co-axial swirling stratified flow burner has been simulated with k-ε-cf model. The computational results agree well with the experimental data.

关 键 词：同轴旋转分层流燃烧器 旋转射流 数值模拟 湍流模型 离心力 方程离散 边界条件 

分 类 号：O358[理学—流体力学]