红外加热笼进行瞬态外热流模拟的优化方法

为研究航天器真空热试验时红外加热笼模拟瞬态外热流的优化方法,文章建立了航天器器表、红外笼与热沉之间的辐射换热模型,得到舱板与红外笼的瞬态温度变化、器表到达热流密度的表达式,得出器表到达热流密度与器表内侧等效吸收热流密度和红外笼带条加电电流之间的关系。分析器表内侧等效吸收热流密度相同和不同的情况,基于红外笼加电控制周期为1 min和红外笼带条热容影响,对红外笼加电方式进行研究,提出变电流的优化加电方法。分析结果可为红外笼作为瞬态外热流模拟手段提供参考,减少瞬态外热流模拟误差。

Optimization method for transient heat flux simulation with infrared heating cage

In order to study the optimization method for transient heat flux simulation with infrared heating cage in the thermal vacuum test of spacecraft, this paper establishes a radiation heat transfer model between the spacecraft surface, the infrared heating cage and the heat sink, and obtains the transient temperatures of the cabin plate and the infrared cage, the expression of the arrived heat flux to the spacecraft surface, as well as the relationship between the external heat flux, the internal equivalent absorbed heat flux and the strip current. The equivalent heat absorption inside the spacecraft wall is analyzed. When the control period of the infrared cage is 1 minute, the strip''s thermal capacity and the power supply of the infrared heating cage are studied, then the power supply with varied current is optimized. The analysis results can provide a reference for using the infrared heating cage as a transient external heat flux simulation approach to reduce the simulation error.