往复式机械泵辅助两相流冷却系统试验研究

文中介绍了一种机械泵辅助两相流系统(Mechanically Pumped Cooling Loop,MPCL),为使MPCL系统更加稳定可靠,研制了一种往复式两相流冷却系统,并对系统不同充液率、启动时间和运行性能进行了研究,获取了最佳充灌率.研究发现,不均匀热源和驱动力不足将降低系统的性能.试验方案从改善热源和提高机械泵驱动能力2方面予以了改进.热源改善后,启动时间缩短,运行性能得到提升.在热源改善的基础上,提高机械泵的驱动能力,可使系统的稳态温度降低,温度波动变小.系统运行时可加大热载荷,在热载荷变化时,系统不会产生温度脉冲.总之,系统的热性能得到大大改善.试验表明,MPCL系统启动平稳,运行安全可靠.系统等效导热系数提高,温度一致性也较好.该系统试验研究结果可作为后续研究的基础.

Experiment of Reciprocating Mechanically Pumped Cooling Loop

A completely new MPCL(Mechanically Pumped Cooling Loop) system is introduced in this paper and the experimental platform is set up to make MPCL operate more stably and reliably. In the preliminary experiment, when the system is filled with different filling rates, the start-up time and operation performances are studied. The optimal filling rate is obtained. Meanwhile it is concluded that uneven heat source and insufficient drive capability of the pump lead to the poor performance of the system. So the experimental scheme is optimized from these two aspects. The start-up time is shortened and the operation performance of the system is improved after the heat source is optimized. Based on the optimized heat source, the drive capability of mechanical pump is improved. The system has shorter start-up time, lower steady-state temperature and smaller temperature fluctuation. The system can have larger heat load when it operates and has no temperature pulse when the heat load changes. In a word, the heat transfer capability of the system is improved greatly. According to the experiment, the MPCL system can start up smoothly and operate safely. The equivalent heat transfer coefficient of the system gets very large and temperature uniformity of the system is very good. The experimental result has laid foundation for further study.