以某超超临界机组中的中压涡流冷却结构为研究对象，采用流热耦合方法进行了数值计算，分析了流域与固体域交界面条件对转轴内部温度分布的影响，并对比了静止与4个旋转速度下转轴的冷却效果。结果表明：对于给定的热边界条件，在设计转速下中压涡流腔室内部流体从转轴带走热量，具有冷却效果；随转速增加，汽流与轮毂壁面的相对速度减小，使壁面温度降低，最大温降增加，转轴内高温区缩小，高温区边界处温度梯度下降，而转轴反转会恶化转轴的热环境。

With the tangential direction cooling structure in the intermediate pressure cylinder of ultrasupercritical steam turbine as the research object,numerical calculations are carried out by the fluidthermal coupling analysis method,and the influence of interface boundary conditions between fluid domain and solid domain on the internal temperature distribution of the shaft is analyzed.In addition,the cooling effect of the shaft under static and four rotating speeds is compared.It is found that under the given thermal boundary conditions of the shaft,the fluid inside the chamber could take heat away from the shaft at the design rotating speed,and could play a cooling role; with the increase of rotating speed,the relative velocity of the steam flow and hub wall decreases,which leads to the hub wall temperature to decrease,the maximum temperature difference to increase,the high temperature zone in the shaft to shrink,and the temperature gradient at the boundary of the high temperature zone to decrease.However,reverse rotation of the shaft will deteriorate the thermal environment of the shaft.

TK221

国家重点研发计划（2018YFB0604404）