化工学报2016，Vol.67Issue(10)：4086-4094,9.
以最佳温度均匀度和最小熵产为目标的航天器热循环试验系统运行参数优化
Operation parameters optimization of spacecraft thermal cycling test system based on temperature uniformity and entropy generation
摘要
Abstract
The temperature uniformity and entropy generation due to heat transfer inside a thermal cycling test chamber are investigated numerically under various operating parameters. Boussinesq approximation andk-ω model are used in the simulation and the result is validated by previous experiment. The result shows that in the range of 4.3×103≤Re≤8.6×105 and 4.62×1013≤Gr≤1.38×1014, both forced convection and natural convection contribute to the fluid flow and heat transfer. Fluid close to the walls gets heated and rises along the walls due to the buoyancy force while that near the center line accelerates downward to the exit. The temperature at the given height always increases from the center line to the walls. From the top to bottom of the cycling chamber, the temperature increases around the center line while decreases near the walls. The dimensionless standard temperature deviation increases with Reynolds number and changes little with Grashof number. During the mixed convection, the entropy generation due to fluid friction is much smaller than that by heat transfer, and the latter increases with both Reynolds number and Grashof number. In addition, the expressions of wall Nusselt number, dimensionless average temperature, dimensionless temperature standard deviation and dimensionless entropy generation by heat transfer are also provided.关键词
数值模拟/对流/传热/温度均匀度/熵产Key words
numerical simulation/convection/heat transfer/temperature uniformity/entropy generation分类
航空航天引用本文复制引用
黄一也,杨光,吴静怡..以最佳温度均匀度和最小熵产为目标的航天器热循环试验系统运行参数优化[J].化工学报,2016,67(10):4086-4094,9.基金项目
国家自然科学基金项目（51476096）。@@@@Foundation item：supported by the National Natural Science Foundation of China (51476096) （51476096）
