钟主海，江生科

(东方汽轮机有限公司，四川 德阳，618000)

超超临界汽轮机组固体颗粒冲蚀的数值研究

钟主海，江生科

(东方汽轮机有限公司，四川 德阳，618000)

文章采用商用计算流体动力学软件CFX，针对某1 000 MW汽轮机组，采用欧拉－拉格朗日法，数值模拟了高压缸首级通道内固体颗粒的运动特性，结果表明：不同粒径的固体颗粒对叶片的冲蚀有着不同的影响，固体颗粒直径越大，发生碰撞时的角度越大,撞击点位置越接近前缘。固体颗粒在静叶压力面、吸力面撞击点的撞击角度均在0°~15°之间。静动叶内的冲蚀区主要集中在压力面的中后部，并且静叶受冲蚀的程度远大于动叶。文章还对静叶出汽边采用Cr2C3抗冲蚀涂层后的流动情况进行了分析和比较，结果表明，采用Cr2C3抗冲蚀涂层对叶片气动性能影响不大。

汽轮机，固体颗粒，冲蚀，抗冲蚀涂层

Abstract：Based on Euler-lagrange method， a numerical sirnulation on the motion behavior of solid particles in the first stage passage of one 1 000 MW steam turbine high pressure cylinder was conducted by the commercial computational flow dynamics software CFX．The results showed that the solid particles with different sizes had different effects on the erosion of blades．The larger the diameter of solid particle is,the larger the anagle of impact is,the closer the impact point is to the leading edge．The impacting angle of solid particles on the impact point of the stator blade pressure surface and the suction surface is between 0°～15°．The erosion area stationary blade and moving blade was concentrated in the rear of the pressure surface．And the degree of eiosion of stationary blades was greater than that of moving blades．This paper also analyzed and compared the flow situation of the exit of stationary blade of that Cr2C3anti erosion ceating．The results showed that Cr2C3anti erosion coating caused little impact to the performance of the turbine stage．

Key words：steam turbine,solid particles,erosion,anti erosion coating

0 引言

随着机组初温的提高，锅炉和管道系统的高温氧化加剧，从管路内壁脱落的氧化物除了频繁堵塞锅炉过热管和再热管外，还将随高速汽流进入汽轮机对调节级喷嘴和再热后第一级静叶产生严重的固体颗粒冲蚀（简称SPE）破坏，导致汽轮机做功效率降低、轴系振动和轴向推力增大，目前其已成为影响高参数汽轮机安全性和经济性的一个突出问题。

固体颗粒冲蚀之所以集中在调节级喷嘴和再热后第一级静叶主要有两个原因：（1）与下游的压力级相比，这两级叶栅的流道面积小、汽流密度大、速度高，导致单位叶栅表面积承受更高的粒子冲击频率和粒子速度；……