微重力条件下FC-72在针肋表面冷凝传热的实验研究

doi:10.11949/j.issn.0438-1157.20190025

摘要/Abstract

摘要：

对微重力条件下矩形窄通道内FC-72蒸气在4种不同参数的椭圆形针肋表面和平板表面上的冷凝传热进行了可视化实验研究，分析了微重力对冷凝表面冷凝液分布、气-液界面、入口蒸气温度、冷凝基底温度、热通量以及冷凝传热系数的影响。结果表明，微重力条件下，矩形窄通道内气-液界面出现不稳定，并有波动和沿侧壁爬升现象。落舱释放前后，冷凝表面液膜形态并未观察到明显变化；对于非稳态状态，冷凝基底温度出现小幅升高，并有一定的滞后，落舱释放后蒸气发生器盘管内流型的转变提高了加热效率，从而导致入口蒸气温度急剧升高；对于脉动状态，基底温度变化情况与非稳态状态相似，但入口蒸气温度并无明显变化；而对于准稳态状态，基底个别测温点温度发生阶跃，入口蒸气温度并无明显变化，热通量和冷凝传热系数发生急剧下降，降幅分别达18%和20%。

关键词: 微重力, 椭圆形针肋, 凝结, 界面, 温度, 两相流

Abstract:

The condensation heat transfer of FC-72 in a narrow rectangular channel with four kinds of elliptical pin-fin surfaces and a flat surface under microgravity condition was studied by visualization experiments. The effects of microgravity on condensate distribution, steam-liquid interface, condensation substrate temperature, inlet steam temperature and heat flux were analyzed. The results showed that the steam-liquid interface in the narrow rectangular channel was unstable, fluctuated and climbed along the lateral wall in microgravity. No obvious changes were observed in liquid film on the condensing surface after the release of drop cabin. For unsteady state, the condensation substrate temperature increased slightly, and there was a certain delay. After the release of drop cabin, the change of flow pattern in steam generator coil improved the heating efficiency, which resulted in a sharp rise in inlet steam temperature. For pulsating state, the change of substrate temperature was similar to that of unsteady state, but there was no obvious change in inlet steam temperature. For quasi-steady state, the temperature at some temperature measuring points jumped a little bit, but the inlet steam temperature had no obvious change. Furthermore, the heat flux decreased sharply in microgravity, falling by 18.8%.

Key words: microgravity, elliptical pin-fin, condensation, interface, temperature, two-phase flow

中图分类号:

TK 124

张雷刚, 许波, 施娟, 陈振乾. 微重力条件下FC-72在针肋表面冷凝传热的实验研究[J]. 化工学报, 2019, 70(S1): 45-53.

Leigang ZHANG, Bo XU, Juan SHI, Zhenqian CHEN. Experimental study on condensation of FC-72 in narrow rectangular channel with ellipse-shape pin fins in microgravity[J]. CIESC Journal, 2019, 70(S1): 45-53.

图/表 11

图1 实验装置

Fig.1 Schematic diagram of experimental device

图2 测试段

Fig.2 Schematic diagram of test section

表1 椭圆形针肋参数

Table 1 Parameters of elliptical pin-fin plates

参数	P4	P5	P7	P10
a/mm	0.6	0.6	0.75	0.6
b/mm	0.3	0.3	0.25	0.3
s_v/mm	1.2	1.2	1.2	1.2
s_p/mm	1.2	2.4	1.2	1.2
h/mm	1.8	1.8	1.8	1.8
a/b	2	2	3	2
n	275	179	253	263
材质	黄铜	黄铜	黄铜	紫铜
排列方式	顺排	叉排	叉排	叉排

表2 微重力实验条件

Table 2 Experimental conditions in microgravity

工况	试件	通蒸气时间/s	冷凝状态	质量流量/ (kg/(m²·s))	相机帧率	数据采集频率
1^#	P0	46.3	非稳态	110.4	30	50
2^#	P4	361.4	准稳态	110.4	30	5
3^#	P5	376.9	脉动状态	110.4	30	50
4^#	P7	19.18	非稳态	110.4	500	50
5^#	P10	20.72	非稳态	110.4	500	50

图3 热电偶安装位置（俯视图）

Fig.3 Mounting position of thermocouples (top view)

图4 实验数据可靠性验证

Fig.4 Reliability verification of experimental data

图5 微重力条件下冷凝液分布及气-液界面分布情况

Fig.5 Distribution of condensate and vapor-liquid interface in microgravity

图6 落舱释放前后入口处蒸气温度变化

Fig.6 Variation of inlet steam temperature before and after release

图7 不同重力条件下紫铜盘管内气-液分布示意图

Fig.7 Schematic diagram of vapor-liquid distribution in copper coil under different gravity conditions

图8 不同冷凝状态下基底各测温点温度变化

Fig.8 Temperature variation in brass base under different condensation states

图9 落舱释放前后P4热通量及冷凝传热系数变化

Fig.9 Variation of heat flux and condensation heat transfer coefficient on P4 before and after release

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