航天器空间环境模拟器热沉热均匀性分析

Thermal Uniformity Analysis for Heat Sink of Space Simulator

通过建立传热数学模型以及求解,给出了空间环境模拟器中热沉热均匀性优化的结果。和其他以肋片为基础的辐射器不同,空间模拟器热沉主要是要尽可能的提高其热均匀性。因此,通过改变热沉的几何参数(热沉肋片长度、肋片厚度和液氮管半径)以及物理参数(液氮流速),进行了详尽的热沉热均匀性分析。在分析中发现,随着热沉肋片厚度的增加和长度的减小,以及流管内流速的增大,其热均匀性都有提高,但是热沉支管半径变化对热沉均匀性的影响并没有肋片长度和厚度以及液氮流速的影响那么明显。最后,根据数值计算结果给出了热沉优化设计参数取值范围和参考意见。

Presented a typical heat sink in a space simulator with heat transfer model. Compared to other fin-structure radiators, heat sink for space simulator is characterized by looking into the enhancement of its thermal uniformity. Thus a detailed parametric study was performed by varying heat sink dimensions （fin length, fin thickness, and liquid nitrogen pipe radius） and surrounding conditions （liquid nitrogen velocity）. It was found that thermal uniformity increased the most with the decrease of fin length, increase of fin thickness, and increase of liquid nitrogen pipe radius as well as the liquid nitrogen flowing velocity. At last, optimized heat sink parameter ranges were offered with help of numerical analysis results after taking some real design factors into consideration.