静叶斜置对高参数汽轮机再热后第一级叶栅冲蚀的影响

在高温、高速加速冲蚀试验结果所建立的叶栅材料冲蚀率模型和粒子反弹模型的基础上,利用三维数值计算法模拟、分析了静叶斜置对超临界及超超临界汽轮机再热后第一级叶栅冲蚀特性的影响.结果表明:再热后第一级静叶斜置角度为30°时,静叶压力面最大冲蚀失重减小了约30％,吸力面尾缘的冲蚀破坏明显减轻,级效率仅下降0.1％；进一步增大斜置角度,再热后第一级叶栅抗磨性能提升并不明显,级效率下降了1％；减小斜置角度会使静叶压力面最大冲蚀失重增加23％,叶栅抗磨性能显著降低.该研究结果可为减轻再热后第一级叶栅的冲蚀破坏提供技术依据.

Influence of Oblique Stator on Erosion Characteristics of Solid Particles in the First Reheat Stage Blades of a Supercritical Steam Turbine

From the blade material erosion models and the particle rebound models produced by the high temperature and high speed accelerated erosion test results,the simulations and analyses were performed on the influence of the oblique stator on the erosion characteristics of solid particles in the first reheat stage of an ultra-supercritical steam turbine by the 3D numerical computing method.The results show that when the oblique angle of the oblique stator in first reheat stage is 30 degrees,the maximum weight loss on the vane pressure surface drops by about 30% and the erosion damage to the trailing edge on the vane suction surface also decreases obviously,and the stage efficiency decreases by only 0.1%.The further increase in the oblique angle may enhance the blade anti-wear property slightly but reduce stage efficiency by 1%.However,the decrease in the oblique angle will increase the maximum weight loss on the vane pressure surface by 23%,leading to a significant reduction in the blade anti-wear property.The results of this study will provide a technical basis for reducing the erosion on first reheat stages.