摘要
为研究枞树形管束凝汽器的流动及换热特性,识别易产生流体弹性激振的高风险区,采用基于多孔介质模型的CFD方法对凝汽器在不同运行工况下的激振风险进行数值研究,获得管束区域风险系数分布。根据研究结果,当机组处于额定运行工况,凝汽器管束区域最大流速为62.7m/s,风险系数最大值为0.38;而当机组处于海水温度为10℃(冬季)叠加汽轮机甩负荷工况下,管束区域最大流速为137.8m/s,风险系数最大值高达0.96,超出设计值的0.64。受管束阻力影响,高风险区主要分布于管指表层区域钛管,与实际开裂位置相符。枞树形管束指缝区域风险系数由外向内急剧下降,而管指顶部区域风险系数平缓下降,需要针对性地采取预防性堵管或者加装防振条等措施。
In order to study the flow and heat transfer characteristics in fir-shaped tube bundle of condenser and identify the high-risk area prone to fluid elastic excitation,the CFD method based on porous medium model is used to numerically study the excitation risk of condenser under different operating conditions,and the distribution of risk coefficient in tube bundle area is obtained.According to the research results,the maximum velocity in the condenser tube bundle area is 62.7m/s and the maximum value of risk coefficient is 0.38 when the nuclear unit is under RP mode,while the maximum velocity in the tube bundle area is 137.8m/s and the maximum value of risk coefficient is as high as 0.96 which exceeds the design value by 0.64 when the cooling water temperature is 10℃superimposed with by-pass mode.Affected by the tube bundle resistance,the highrisk area is mainly distributed in the surface area of the tube finger,which is consistent with the actual cracking position.The risk coefficient in the finger seam area of fir-shaped tube bundle decreases sharply from outside to inside,while the risk coefficient in the top area of tube finger decreases gently.Preventive tube plugging or anti-vibration strip shall be taken.
作者
祖帅
车银辉
刘艳庄
汪国山
ZU Shuai;CHE Yin-hui;LIU Yan-zhuang;WANG Guo-shan(Suzhou Nuclear Power Research Institute,Shenzhen 518000,China;School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《汽轮机技术》
北大核心
2022年第1期33-37,共5页
Turbine Technology
关键词
凝汽器
钛管
多孔介质
流体弹性激振
CFD
condenser
titanium tubes
porous medium
fluid-elastic instability
CFD
作者简介
祖帅(1990-),男,硕士,工程师。从事核电厂重大设备数值仿真研究等工作。
