何庆中,刘〓怡,陈〓玺,刘玉聪.超(超)临界主给水调节阀流场特性分析[J].水电能源科学,2018,36(6):175-178
超(超)临界主给水调节阀流场特性分析
Flow Characteristic Analysis of Ultra supercritical Main Feed water Regulating Valve
  
DOI:
中文关键词:  超(超)临界  主给水调节阀  多相流  空化  逐级降压
英文关键词:ultra supercritical  main feed water regulating valve  multiphase flow  cavitation  step by step depressurization
基金项目:四川理工学院研究生创新基金项目(y2016013);四川省科技计划项目(2017GZ0359);四川省教育厅创新团队项目(17TD0026);自贡市科技支撑项目(2016J216);自贡市科技计划创新服务团队项目(2016RC2)
作者单位
何庆中,刘〓怡,陈〓玺,刘玉聪 四川理工学院 机械工程学院四川 自贡 643000 
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中文摘要:
      针对某超(超)临界主给水调节阀在运行工况条件下出现的空化汽蚀现象,结合多级节流降压原理与多相流理论,采用Schnerr and Sauer空化模型和Mixture两相流模型,对调节阀内部流场进行数值模拟,研究了笼罩层数与导流槽宽度对流场空化的影响。结果表明,随着笼罩层数的增加,调节阀内的最低压强由0.015 MPa上升至0.717 MPa,最大流速由147.1 m/s降至49.36 m/s,空化的汽相最大体积分数由0.979降至0.160,多级笼罩有助于实现逐级降压、限制流速及抑制空化的目的;同时在阀门结构尺寸允许条件下,适当增加导流槽宽度也有利于抑制空化。研究结果为该类调节阀的设计提供了参考。
英文摘要:
      Aiming at the cavitation phenomenon of a ultra supercritical water regulating valve under operating condition, combining with multistage throttling principle and multiphase flow theory and adopting the Schnerr and Sauer cavitation model and the Mixture two phase flow model, numerical simulation of interior flow field of regulating valve was carried out to study the influence of the number of shrouded layers and the width of the diversion channel on the cavitation in the convection field. The results show that the minimum pressure in the regulating valve rises from 0.015 MPa to 0.717 MPa, the maximum flow rate drops from 147.1 m/s to 49.36 m/s, and the maximum volume fraction of cavitation vapor drops from 0.979 to 0.16 with the increase of the number of shrouded layers. Thus, the multistage layer shroud is helpful to realize the step by step depressurization, limiting the flow velocity and suppressing the cavitation. At the same time, under the condition of the valve structure size, increasing the width of the diversion tank properly is also beneficial to suppress cavitation. The results can provide reference for the design of the regulating valve.
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