摘要
为了提高空气流动换热数值计算结果精度,本文针对可压缩空气开展模型、数据处理方法的适用性研究。本文基于开式反应堆内通道,采用计算流体力学方法,在雷诺数1万~40万、温度450~1200 K的范围内,针对可压缩性、定性温度及粘性加热效应等空气流动换热的关键问题,得到不同湍流模型下加热空气管流的平均换热系数;结合经典传热关系式,确定了数据处理方法并讨论了粘性加热效应的影响特点。计算结果表明:Realizable k-ε模型更适宜高温高速可压空气流动;采用进出口平均温度作为定性温度,得到的传热关系式与经典关系式误差在10%以内,满足计算要求;计算中应考虑粘性加热效应,该效应仅会使高雷诺数工况的努塞尔数Nu减小。本文可为精确计算空气流动换热特性提供依据。
To improve the accuracy of air flow and heat transfer in numerical study,the research on viscous model and data processing method of compressible air is conducted.The average heat transfer coefficients of airflow in the heating tube are obtained using the computational fluid dynamics method with Re ranging from 10000 to 400000 and temperature ranging from 450 K to 1200 K.To solve the key problems of airflow and heat transfer,such as compressibility,qualitative temperature,and viscous heating effect,the average heat transfer coefficient of heated air pipe flow under different turbulence models is obtained.Combined with the classical heat transfer relation,the data processing method is determined,and the characteristics of the influencing factors of the viscous heating effect are discussed.The results indicate that the realizable k-εmodel can simulate the high-temperature and high-speed compressible airflow.The deviation of the heat transfer correlation between the numerical method and Gnielinski correlation is determined to be within 10%using the average temperature of the inlet and outlet as qualitative temperature,which is acceptable.The viscous heating effect,which will decrease Nu under high Re conditions,should be considered.This study provides a basis for the accurate calculation of the heat transfer characteristics of air.
作者
卢瑞博
宁可为
邱志方
余霖
赵富龙
谭思超
LU Ruibo;NING Kewei;QIU Zhifang;YU Lin;ZHAO Fulong;TAN Sichao(College of Nuclear Science and Technology, Harbin Engineering University, Harbin 150001, China;Heilongjiang Provincial Key Laboratory of Nuclear Power System & Equipment, Harbin 150001, China;Nuclear Power Institute of China, Chengdu 610000, China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2021年第12期1733-1738,共6页
Journal of Harbin Engineering University
基金
核反应堆系统设计技术重点实验室基金项目(HT-KFKT-02-2019002)
黑龙江省博士后基金项目(LBH-Z19013).
关键词
计算流体力学
开式反应堆
定热流加热
高温高速空气
变物性
模型适用性
粘性加热
定性温度选择
computational fluid dynamics
open cycle reactor
fixed heat flux
high-temperature and high-speed air
variable physical properties
applicability of viscous models
viscous heating
selection of qualitative temperature
