摘要
基于CFD仿真软件FLUENT,建立了封闭球形容腔内氦气关键物性参数随温度变化的深低温自然对流仿真模型。利用该模型对封闭球形容腔内20～100 K温度下不同瑞利数(10~8<Ra<10^(11))伪稳态自然对流换热进行了数值模拟,得到了速度场分布、温度场分布和努塞尔数(Nu).开展了液氢温区球形封闭容腔内氦气伪稳态自然对流换热试验。通过与试验数据的对比分析,验证了本文所提出的深低温自然对流模型的有效性。利用最小二乘法,获得了深低温球形容腔内氦气自然对流换热准则数方程。
Based on the FLUENT software, a model was established to analyze the natural convection heat transfer to helium contained within a closed spherical cavity at deep low temperature,which considered the change of critical fluid property with temperature. The numerical solutions for the velocity, temperature distributions, and the average Nusselt number for pseudosteady-state natural convection in sphere cavity were calculated for temperature range of 20 K to 100 K and Rayleigh numbers from 10^8 to 10^11. The effectiveness of the simulation model was validated by the pseudosteady-state natural heat transfer experiments of helium within a closed spherical cavity at liquid hydrogen temperature. Using the least squares method, the Nusselt number equation of natural convection heat transfer is obtained.
作者
王恺
伍继浩
陈二锋
吕翠
魏操兵
WANG Kai;WU Ji-Hao;CHEN Er-Feng;LU Cui;WEI Cao-Bing(State Key Laboratory of Technologies in Space Cryogenic Propellants （Technical Institute of Physics and Chemistry, Chinese Academy of Sciences）, Beijing 100190, China;University of Chinese Academy of Sciences~ Beijing i00049~ China;Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2018年第7期1518-1523,共6页
Journal of Engineering Thermophysics
基金
国家财政部专项资助项目(No.Y5AF021ZD8)
中科院低温工程学重点实验室青年科技创新项目(No.CRYOQN201711)
关键词
深低温
球形容腔
自然对流
数值仿真
试验
deep low temperature
sphere enclosure
natural convection
numerical simulation
experiment
