摘要
固体颗粒冲蚀严重影响超常参数汽轮机调节级喷嘴寿命．本文根据相似理论并借助PIV技术,进行了三种喷嘴内固体微粒运动特性及其材料抗冲蚀特性的试验研究,并通过三维数值模拟进一步研究了单一参数变化对粒子运动特性的影响．发现同一粒子再次撞击角度比初次撞击角度平均小5°～15°；约45%～80%的粒子撞击在离喷嘴出口边约15%的区域；粒子对前加载型线喷嘴有更严重的冲蚀,可以预测采用合适型线的后加载喷嘴或缩短喷嘴宽度能有效降低粒子冲蚀．
Solid particle erosion （SPE） is very critical on the life cycle of control stage nozzle for supernormal parameters steam turbine. Based on similarity theory and PIV technique, the experiments have been done on material anti-erosion capability and particles moving characteristic within three kind nozzles in this paper, and three-dimension numerical simulation was used to further investigate the contribution of every parameter on particles moving. The angle of particle＇s second impact on wall is 5°-15° smaller than the first impact. There are about 45%-80% impact happened on the 15% region from outlet edge of nozzle. SPE on fore-loaded nozzle is more severe, and the results suggest that the damage of SPE can be reduced by using back-loaded nozzle with suitable profile and reducing width of nozzle.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2007年第2期265-267,共3页
Journal of Engineering Thermophysics
基金
国家自然科学基金(N0.50476051
No.50323001)
关键词
汽轮机
调节级
固体微粒冲蚀
试验研究
数值模拟
steam turbine
control stage
solid particle erosion
experimental investigation
numerical simulation
