热力发电2017，Vol.46Issue(2)：88-93,6.DOI:10.3969/j.issn.1002-3364.2017.02.088
超(超)临界机组主给水调节阀内部空化流场模拟
Numerical simulation of cavitation in main feed valve of ultra-supercritical units
摘要
Abstract
Aiming at solving the problem of control valve cavitation damage in main feed system of ultra-supercritical thermal power units,this paper carried out numerical simulation on internal flow field of the control valve,by combining with multistage throttle theory and multiphase flow technology,and using the computational fluid dynamic software CFX.The influence of shroud stage and ring hole on the control valve's cavitation flow field was studied.The results show that,due to the multistage shroud structure,the minimum pressure inside the control valve rises from 3.55 MPa to 6.58 MPa and is higher than the cavitation pressure,and the maximum vapor fraction reduces from 0.96 to almost zero.The velocity of the whole flow field reduces obviously,so the damage of the control valve caused by cavitation can be effectively prevented.Moreover,on the premise of satisfying the operating conditions of the control valve,increasing the throttle hole number will leading to opposite effects on the pressure reduction and velocity control.关键词
超(超)临界/火电机组/主给水/调节阀/空化汽蚀/多级节流/多相流Key words
(ultra) supercritical/thermal power unit/main feed water/control valve/cavitation/multistage throttle/multiphase flow分类
机械制造引用本文复制引用
刘佳,何庆中,刘晓叙,郭斌,刘玉聪,刘怡,陈玺..超(超)临界机组主给水调节阀内部空化流场模拟[J].热力发电,2017,46(2):88-93,6.基金项目
国家能源局(国能科技[2010]335号)项目(2011HVCHT095) （国能科技[2010]335号）
四川省高校重点实验室开放基金科研项目(GK201302) （GK201302）
自贡市科技创新苗子工程专项(2015CXM034) （2015CXM034）
四川理工学院研究生创新基金(Y2015002)Technology Project of National Energy Administration (GNKJ[2010]No.335) (2011HVCHT095) （Y2015002）
Open Fund Research Project for Key Laboratories in Universities of Sichuan Province(GK201302) （GK201302）
Special Funds for Talent Project of Science and Technology Innovation of Zigong City(2015CXM034) （2015CXM034）
Innovation Fund for Graduates in Sichuan University of Science & Engineering(Y2015002) （Y2015002）
