摘要
对于不同机组,汽轮机调节级内部结构不尽相同,其中的固体颗粒冲蚀规律也会有区别。以某600MW汽轮机调节级叶栅为研究对象,采用欧拉-拉格朗日法,数值模拟了调节级静、动叶栅通道内固体颗粒的运动特性,研究了固体颗粒的运动规律,分析了固体颗粒对喷嘴叶片、动叶片的冲蚀。研究发现不同粒径的固体颗粒对叶片的冲蚀有着不同的影响,大粒径粒子造成的冲蚀占主要比例,小粒子甚至未对叶面发生碰撞;喷嘴内的冲蚀区集中在压力面的中后部;动叶内的冲蚀区位于压力面中后部以及柱形前缘,压力面中后部靠近叶尖部位的地方冲蚀最为严重。
For different units, the control stage of steam turbine would have different internal structure. Then the erosion of solid particles in it would be different. The control stage of one 600MW steam turbine was researched in paper. Using the Euler-Lagrange method, the flow characteristics of solid particles in the cascade channels was numerical simulated. The flow characteristics of solid particles in the cascade channels were analyzed. And the erosion distribution on the nozzle blade and rotating blade caused by solid particles was also analyzed. The analysis showed that the erosion on the blades caused by different size particles was different. The large diameter particles would cause more erosion than the small particles. The smaller particles does not even collide the blades. In the nozzle, the erosion area is concentrated on the rear of the pressure surface. In the rotor, the erosion area is located at the rear of the pressure surface and the blade leading edge. The area on the pressure surface near the blade tip was more eroded.
出处
《汽轮机技术》
北大核心
2013年第1期31-34,64,共5页
Turbine Technology
基金
上海市教委重点学科(第五期)(J51304)
第三期本科教育高地建设项目(A88001)资助
关键词
汽轮机
调节级
固体颗粒
冲蚀
数值模拟
steam turbine
control stage
solid particles
erosion
numerical simulation
