大型空冷汽轮发电机转子三维流场计算  

Calculation of Three-dimensional Rotor Flow Field of Large Air-cooled Turbo-generator

作　　者：孙永彪 王坤[2] SUN Yongbiao;WANG Kun(Hebei Normal University,Shijiazhuang 050024,China;Huazhong University of Science and Technology,Wuhan 430070,China)

机构地区：[1]河北师范大学,石家庄050024 [2]华中科技大学,武汉430070

出　　处：《大电机技术》2021年第2期7-12,18,共7页Large Electric Machine and Hydraulic Turbine

基　　金：国家重点基础研究发展计划(973计划)项目(2015CB251504)。

摘　　要：某大型空冷汽轮发电机转子采用导线双向进风的冷却方式,为研究其端部、轴径向转子槽内冷却空气流量分布及其内、外流场在旋转情况下的特征,本文建立了包括端部弧段和轴径向段转子槽内外流域及与之对应的气隙在内的半轴段1/2圆三维物理模型。依据计算流体动力学原理,采用有限体积法,对计算域内的三维流场进行了数值模拟。结果表明:转子旋转会影响转子槽内、外的流场特性,并对R区(迎风区)和L区(背风区)导线内流量分布、导线内外流场压力分布及速度分布具有不同程度的影响;在轴径向进风口处的压力范围为(22.10±12)k Pa;在端部进风口处压力范围为(22.25±15)k Pa;轴径向槽楔出风口处的最高速度为228.2m/s。The half round three-dimensional physical model is created including the internal and external flow field of the end and axial-radial rotor slots with the relavent air gap for a large air-cooled turbo-generator rotor which allows the cooled air enters the conductor in two ways,in order to study the air mass distribution in the slots and conductors as well as the flow characteristics of internal and external flow field under the condition of rotor rotation.According to the principle of computational fluid dynamics(CFD),the three-dimensional flow field in the computational domain is numerically simulated by the finite volume method.The results show that the rotor rotation has effects on the internal and external flow field characteristics of rotor slots,the flow distribution in the R zone(windward side)and the L zone(downwind end),the pressure distribution and velocity distribution in the internal and external field of the conductor.The pressure ranges at the axial-radial conductor inlets and at the end conductor inlets are(22.10±12)kPa,(22.25±15)kPa,respectively.The maximum velocity at the air outlet of the axial-radial slot wedges is 228.2 m/s.

关 键 词：空冷汽轮发电机 通风冷却模型 转子 三维流场 仿真计算 

分 类 号：TM301.4[电气工程—电机]