摘要
为了对凝汽器进行性能分析并为优化设计提供理论依据,运用计算流体力学方法,采用多孔介质模型对凝汽器水侧管束区域进行简化,采取减少管束区域长度并根据减少后的长度修正阻力系数的方法进行优化,减少了冷却水在多孔介质模型中的流动扩散。通过三维数值模拟计算了凝汽器水侧的流动参数,得出水侧影响凝汽器性能的因素:凝汽器进口水室存在漩涡使得流动阻力增加;不同管束区域冷却水流量差距较大,会对凝汽器性能产生影响。数值模拟结果表明用多孔介质模型对水侧管束区域进行简化是可行的。
To provide theoretical bases for design optimization of a condenser, the computational fluid dynamics method was used to carry out performance analysis of the condenser, while a porous media model was adopted to simplify its cooling water tube regions, and the model was further optimized by reducing the length of the tube region and correcting the resistance factor according to the reduced length, thus reducing the flow and diffusion of cooling water in the porous media model. The cooling water flow parameters were calculated through a 3-dimensional numerical simulation model, based on which the factors influencing the condenser＇s performance were found to be as follows： the vortices existing in the inlet cooling water chamber, which increase the flow resistance; the cooling water flow differs a lot in different tube regions, which influences the performance of the condenser. Simulation results show that it is feasible to simplify the cooling water tube regions by porous media model.
作者
易思强
杨建明
Yi Siqiang Yang Jianming(School of Energy and Environment, Southeast University, Nanjing 210096, China)
出处
《发电设备》
2017年第2期81-85,共5页
Power Equipment
关键词
汽轮机
凝汽器
多孔介质模型
数值模拟
steam turbine
condenser
porous media model
numerical simulation
