摘要
引入多孔介质,采用k-ε湍流模型,利用准三维数值计算方法对一双流程凝汽器的汽相流动与换热进行计算与分析。针对由于凝汽器喉部低压加热器和扩散角的影响以及冷却水温沿流程变化而引起的蒸汽热负荷分配不均的问题,提出安装导流板改善流动与传热特性的措施。通过计算证实:添加导流挡板后,增大了左边管束区的蒸汽流量,保证了这一区域管束的蒸汽负荷,提高了传热面积的有效利用面积,沿冷却水流向各管束区域的蒸汽负荷分配较为均匀,增加了蒸汽凝结量,提高了凝汽器真空,凝汽器的工作性能得到改善。
By introducing porous media, the article calculate and analyze the steam flow and heat transfer of a two-pass condenser using the k-ε turbulence model and the quasi-three-dimensional numerical calculation method. To addressed the uneven distribution of steam thermal load caused by the impact of angle flare, the LPH in the condenser throat and cooling water temperature changed along the process, the measures installing guide plate to improve flow and heat transfer characteristics have been introduced. The calculation confirms that the steam flow of left pipe bundle is increased by add guide plate. It ensures the steam load of this region and improves the effective use of the heat transfer area. The steam load of each pipe bundle region distributes more uniform along the cooling water, The steam condensation, condenser vacuum and the condenser performance are improved.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2008年第23期25-30,共6页
Proceedings of the CSEE
关键词
凝汽器
流动
传热
数值分析
condenser
fluid flow
heat transfer
numericalanalysis
