具有恒热流边界的水升华器启动特性实验
收稿日期: 2013-09-06
修回日期: 2014-01-15
网络出版日期: 2014-02-21
基金资助
国家科技重大专项
Experiment on Startup Performance of Sublimator with Constant Heat Flux Boundary
Received date: 2013-09-06
Revised date: 2014-01-15
Online published: 2014-02-21
Supported by
National Science and Technology Major Project
水升华器是具有短时大功耗或所处环境温度较高的航天器较为理想的散热装置。以往的研究工作对水升华器的启动性能关注较少，本文对水升华器启动工作机理及其影响因素进行了分析，对初始温度、给水压力及热负荷对水升华器启动过程瞬态特性的影响开展了实验研究。结果表明：具有恒热流边界的水升华器在不同条件下启动后，均可以在给水后的短时间内建立稳定的相变工作模式；水升华器目标温度所能达到的稳定温度水平主要受热负荷的影响，而受启动初始温度和给水压力的影响较小；水升华器的启动响应时间与其初始温度、给水压力及热负荷均分别呈线性关系，较高的初始温度会增加水升华器的响应时间，而增加给水压力及热负荷则缩短了水升华器的响应时间。由实验数据分析得到的拟合系数1/aq0可以作为水升华器多孔板和加热面之间的等效换热系数。
王玉莹 , 钟奇 , 宁献文 , 苗建印 , 李劲东 . 具有恒热流边界的水升华器启动特性实验[J]. 航空学报, 2014 , 35(6) : 1571 -1580 . DOI: 10.7527/S1000-6893.2013.0523
The sublimator is an ideal heat rejection device for the spacecraft which works with peak heat loads or in warm thermal environments. However, few research efforts have focused on the startup performance of a sublimator. In this paper the startup work mechanism and the performance related factors of the sublimator are analyzed, and experiments are carried out about the influence of initial temperature, feed water pressure and heat load on the transient performance of sublimator startup. The experiment results indicate that a sublimator with constant heat flux boundary can establish a steady phase change work mode in a short period after water is fed to it. The initial temperature and the feed water pressure have little influence on the steady state temperature of the sublimator, while the heat load has a greater impact on the steady state temperature. The startup response time shows a linear relationship with the initial temperature, feed water pressure and heat load respectively. Increase of the initial temperature leads to a longer response time, while increase of feed water pressure and heat load results in a shorter response time. The coefficient 1/aq0 analyzed from the experiment results can reflect the heat transfer coefficient between the sublimator porous plate and the heat source.
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