COIL低温真空吸附床结构的改进

 压力恢复系统是氧碘化学激光器的重要组成部分。采用低温真空吸附系统作为氧碘化学激光器的压力恢复系统，吸附床的吸附性能决定着低温真空吸附系统的压力恢复性能。通过改变液氮在传热过程中的流动状态，改善液氮与吸附床之间的热交换效率。对两种不同结构吸附床的传热系数进行了计算及实验验证，结果表明:当液氮在传热过程中的流动状态由环状流变为泡状流时，可以很好地改善液氮与吸附床的传热效率。改进后的液氮与吸附床的传热系数提高了2.2倍，提高了吸附床的吸附性能。

Structure improvement of cryosorption bde for COLL

The pressure recovery system is an important part of Chemical Oxygen-Iodine Laser(COIL).Adopting cryosorption vacuum system as the pressure recovery system of COIL,the pressure recovery capability of cryosorption vacuum system is determined directly by the performance of adsorption bed.In this paper,the heat transfer efficiency of the adsorption bed with different structure was studied with theoretic and experimental approaches.It is found that the flow state and pattern of liquid nitrogen in pipe have great influences on the heat transfer.After structure improvement,the heat transfer coefficient between adsorption bed and liquid nitrogen has been increased by 2.2 times.It is proved that the improvement in the adsorption bed structure has enhanced the heat transfer effect of adsorption bed,therefore enhanced the adsorption ability of the adsorption bed.