摘要
针对轴封式核主泵的水平螺旋管换热器复杂的结构特点和特殊的运行环境,采用流热耦合的数值模拟方法分析壳侧流体的流量和温度改变对换热器的流场和温度场的影响,探究换热器壳侧进口参数对换热器内流体流动换热特性的影响规律,并采用相关传热准则数分析换热器强化传热性能。结果表明:水平螺旋管流体受曲率的影响产生离心力,形成了有别于直管流动换热的二次流,速度分布呈内凹的圆弧状,会增强换热器传热效率;随壳侧流速的增加,流体的扰动程度加强,湍流程度提高,同时压力损失无明显变化,换热器传热性能增强;在既定结构和尺寸下,由换热器的传热性能曲线可知,壳侧流量和雷诺数的增加对强化螺旋管传热有显著影响。实际工程应用中可采用适当提高换热器的壳侧流量的方法来加强传热。
According to the complicated structural characteristics and special operating environment of the horizontal spirally coiled tubes heat exchanger of the shaft sealed type reactor coolant pump,the numerical simulation method of thermal-fluid coupling was used to analyze the influence which was the change of the flow rate and temperature of the shell-side fluid to the velocity profile and temperature contour of the heat exchanger.The effect of the inlet parameters of the shell-side on the fluid flow and heat transfer characteristics of the spiral tube heat exchanger was investigated,and the performance of the enhanced heat transfer of the heat exchanger was analyzed by the dimensionless criterion numbers of heat transfer.The results show that the influence of the curvature of the horizontal spiral tube fluid generates centrifugal force,which forms a secondary flow different from the heat transfer of the straight tube.The velocity distribution is a concave arc,which enhances the heat transfer efficiency of the heat exchanger.With the increase of the velocity of the shell side,the degree of disturbance of fluid flowing is enhanced and the degree of turbulence is increased.At the same time,the pressure loss does not change significantly,and the heat transfer performance of the heat exchanger is heightened.Under the given structure and size,it can be seen from the heat transfer performance curve of the heat exchanger that the increase of shell-side flow and Reynolds number has a significant impact on strengthening heat transfer of the spiral tubes.In practical engineering applications,the method of appropriately increasing the flow rate can be used to enhancing the heat transfer.
作者
岳清雯
赖喜德
陈小明
胡萍
YUE Qing-wen;LAI Xi-de;CHEN Xiao-ming;HU Ping(School of Energy and Power Engineering,Xihua University,Chengdu,China,Post Code:610039)
出处
《热能动力工程》
CAS
CSCD
北大核心
2021年第4期118-125,共8页
Journal of Engineering for Thermal Energy and Power
基金
四川省科技计划(2020ZHCG0018,2020YFG0350)
2020年四川省工业发展资金
西华大学研究生创新基金(ycjj2019044)。
关键词
轴封式核主泵
水平螺旋管换热器
耦合传热
数值模拟
性能分析
shaft sealed type reactor coolant pump
horizontal spirally tubes heat exchanger
coupling heat transfer
numerical simulation
performance analysis
