摘要
针对汽轮机末级湿度过大导致叶片损伤和级效率下降问题,运用k-ε两方程湍流模型,DPM和EWF模型耦合方式,对蒸汽在空心静叶栅通道内的蒸汽流动、水滴沉积及成膜过程进行了数值研究;设计了两种除湿方案并数值分析了不同方案除湿效果。结果表明:负荷不同对水滴沉积影响较小;较大水滴粒子是液膜沉积的主要来源;压力面在相对叶高0.5以上部位均有沉积;吸力面在相对叶宽0到0.2部位均有沉积且在相对叶高0.4以上部位沉积较为明显;压力面和吸力面各开两道槽的除湿方案更有利于水膜的抽吸,可明显抑制水膜进一步增厚及运动趋势。
For the problem of the blade damage and reduced stage efficiency caused by the excessive humidity at the last stage of turbine,based on k-ε turbulent mode,DPM and EWF model coupling method are used to study the steam flow,water droplet deposition and film forming process in the hollow static cascade channel,and two kinds of dehumidification schemes are designed and analyzed numerically. The results show that the different loads have little influence on the deposition of water droplets,and the larger water droplet particles are the main source of liquid film deposition,and the pressure surface is deposited over 0.5 parts of the relative blade height,the suction surface is deposited at the relative blade width of 0 to 0.2,and the deposition in the relative blade height is more than 0.4,and the pressure surface and the suction surface each open two channels dehumidification scheme of the tank is more conducive to the suction of the water film,and can obviously inhibit the further thickening and movement trend of the water film.
作者
屈海涛
王智
白娜
赵豫晋
田欢
李冰天
QU Hai-tao;WANG Zhi;BAI Na;ZHAO Yu-jin;TIAN Huan;LI Bing-tian(China Datang Corporation Science and Technology Research Institute Central-China Branch,Zhengzhou 450000, China;School of Energy,Power and Mechanical Engineering,North China Electric Power University,Baoding 071003, China;China Resources Power (Panjin)Company Limited,Panjin 124000, China)
出处
《汽轮机技术》
北大核心
2019年第2期118-122,共5页
Turbine Technology
