摘要
凝汽器管束在高速蒸汽冲刷作用下可能会产生汽流激振现象,全面评估管束的汽流激振对保障机组安全运行具有重要的安全意义。采用数值模拟方法,在某核电机组凝汽器若干工况下,对其喉部和壳侧进行蒸汽流场的数值模拟,然后基于凝汽器蒸汽流场分布,分别以最大许用跨距和临界横流速度为评估准则对管束进行汽流激振评估。研究结果表明:对于所研究的核电机组凝汽器,在管束轴向方向上,靠近壳体壁面侧的管束的中段位置为发生汽流激振的危险区;在管束横截面方向上,靠近壳体壁面侧的管束模块上方“树枝”通道外层的冷却管发生汽流激振的可能性很大,且高加疏水工况会加大靠近有闪蒸器这一侧壳体壁面的管束模块在该处汽流激振的可能性;半侧隔离工况下,各管束模块两侧中间位置“树枝”通道外层冷却管有发生汽流激振的可能性。
The condenser tube bundle may experience steam flow-induced vibration under the flowing across from high-speed steam.A comprehensive evaluation of the steam flow-induced vibration for the tube bundle is of great safety significance for ensuring the safe operation of the unit.In this paper,the numerical simulation method wasused to simulate the steam flow field at the throat and shell sides of one nuclear power unit condenser under several operating conditions.Then,based on the steam flow fields in the condenser,Maximum Allowable Spanand Critical crossflow velocity were used to evaluate the steam flow-induced vibrationfor the tube bundle.The results showed that for the studied nuclear power plant condenser,the mid-section of the tube bundle near the shell wall of the condenser in the axial direction of the tube bundlewas a hazardous area prone to steam flow-induced vibration.On the cross-section of the tube bundle,the cooling tubes on the outer layer of the"branch"channels above the tube module near the shell wall were highly susceptible to steam flow-induced vibration.And HP heater drainage condition would increase the likelihood of steam flow-induced vibration in the tube bundle module nearthe flasher.
作者
张莉
陈仁军
汪昆
张冬
ZHANG Li;CHEN Ren-jun;WANG Kun;ZHANG Dong(College of Energy and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 201306,China;China Energy Engineering Group East China Electric Power Test Research Institute Co.,Ltd.,Hangzhou 311200,China;Ningbo Zhenhai Tianda Environmental Protection Building Materials Co.,Ltd.,Ningbo 315200,China)
出处
《汽轮机技术》
北大核心
2024年第3期193-197,240,共6页
Turbine Technology
关键词
凝汽器
流场
数值模拟
汽流激振
condenser
flow field
numerical simulation
steam flow-induced vibration
