旋流燃烧室内三维等温流场研究  

Investigation on the three-dimensional isothermal flow field in a swirl combustion chamber

作　　者：程勇[1] 汪军[1] 

机构地区：[1]上海理工大学动力工程学院,上海200093

出　　处：《上海理工大学学报》2004年第5期388-392,共5页Journal of University of Shanghai For Science and Technology

基　　金：上海市重点学科建设资助项目(能源岛关键技术及基地建设)

摘　　要：采用三维RNGk ε湍流模型进行了旋流燃烧室内等温流场的数值模拟,给出了旋流燃烧室内不同截面位置速度分布的计算结果.数值模拟结果与文献中实验数据的比较表明,两者符合较好.该燃烧室采用叶片式旋流器并配置一次和二次空气径向射流.比较了一次空气射流和二次空气射流对燃烧室内流场的影响.研究结果表明,经旋流器进入燃烧室的旋转气流和一次射流空气在燃烧室头部形成回流区,这将有助于缩短火焰长度和稳定燃烧.一次空气射流深度几乎达到燃烧室中心,有利于气流的混合并增大回流量;二次空气射流深度较浅,其对燃烧室内流场的影响较小.The three dimensional RNG k-ε model is employed for investigations on the three-dimensional isothermal flow field in a swirl combustion chamber which is equipped with a vane-type swirler,primary-jet and dilution orifices.Velocity profiles on different cross sections of the swirl combustion chamber are predicted,and they are compared and found in fairly well agreement with the experimental data in literature.The effects of primary and dilution jets on the flow field in the combustion chamber are discussed.It is concluded that a central recirculation zone close to the inlet of the combustor is generated by the swirl streams from the swirler and the primary jets,which is beneficial to reducing flame length and stabilizing combustion.The primary jet streams can penetrate into the central region of the combustor,which is conducive to the mixing of streams and increasing of recirculation.However,the depths of penetration for the dilution streams are relatively small,and they have a relatively little influence upon the flow field in the combustor.

关 键 词：燃气轮机 旋流燃烧室 湍流 数值模拟 速度分布 

分 类 号：TK473.2[动力工程及工程热物理—动力机械及工程] O242.1[理学—计算数学]