旋流燃烧室内等温流场特性的研究  

Research on Isothermal Flow Field Characteristics of Cyclone Combustion Chambers

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：《动力工程》2005年第3期331-334,共4页Power Engineering

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：采用三维轴对称RNG k ε湍流模型模拟了微型燃气轮机旋流燃烧室内的等温流场,用粒子测速仪(PIV)测量了旋流燃烧室内不同截面位置的速度矢量分布。对数值模拟结果与实验数据进行了比较分析,研究结果表明:旋流空气在燃烧室头部形成回流区,PIV实验测量的中心回流区范围小于计算结果,燃烧室中心轴的速度小于周围区域的速度,旋流燃烧室内的环向速度衰减较慢,燃烧室内充满旋流。在实验过程中,发现垂直于轴向的横截面PIV测量结果优于轴向截面的PIV测量结果;适当地增加光面厚度,有利于捕捉到更多的粒子,提高测量精度。图6参7。The isothermal flow field in a cyclone combustion chamber is being modeled by a 3-dimensional axis-symmetric RNG k-ε turbulent flow model. A particle image velocimeter (PIV) was use for measuring the velocity vector distribution in various cross-sections of a cyclone combustion chamber. Numerical simulation results are compared with test data and are analyzed. Results reveal that the swirling air flow generates a recirculation zone in the combustion chamber's front part, but the extent of which, according to PIV test measurements, was found to be smaller than that obtained by numerical calculation. It was further found that the velocity along the combustion chamber's center line is smaller than that in the surrounding space, that the tangential velocity components in the combustion chamber decay relatively slow, and the whole combustion chamber was full of swirling flow. It was moreover discovered during the test that PIV measurement results in cross-sections perpendicular to the center line were better than those obtained in axial sections and also that increasing the thickness of optical planes would be favorable for capturing sight of more particles and thereby raising measurement precision.

关 键 词：动力机械工程 旋流流场 RNG k-ε湍流模型 PIV 数值模拟 

分 类 号：TK223.21[动力工程及工程热物理—动力机械及工程]