某型燃气轮机燃烧室预混燃烧流场数值研究

摘要

本文以某型燃气轮机燃烧室为模型,采用数值方法对其内部流场结构以及NOx排放进行了研究.结果表明,燃烧室回流区由环形射流、中心回流、各旋流喷嘴中心回流、相邻旋流喷嘴之间的低速小回流以及在侧壁面与端壁之间形成的角落回流等5种不同流型共同组成;旋流数增加(0.626 9~0.940 3),燃烧室内回流区的体积减小,火焰长度减小,火焰根部向喷嘴端移动,燃烧室出口平面温度分布更均匀,燃烧室NOx排放降低.%One heavy duty gas turbine combustor have been researched by numerical methods.The flow filed and the relationship between the swirl number and NOx emissions have been studied.The results show that the recirculation zone is constituted by five different flow composition;the volume of the recirculation zone, and the flame length, and the NOx emission reducing with the increase of the swirl number(0.626 9~0.940 3);moreover, the flame moving towards the upstream and the with the swirl number increase.