为提高压力恢复系统效率,设计并制造了一台高翅管换热器。采用滚扎而成的整体式螺旋高翅片管,代替套片式圆形普通翅片管,翅片管材料为紫铜,管束按等腰三角形叉排布置,管内强制水冷。测试了高翅管换热器的阻力特性,对比分析了加入换热器前后压力恢复系统性能的变化。结果表明: 随着背压的提高,该换热器流阻逐渐降低,当背压达到9.366 kPa时,换热器流阻为0.133 kPa,仅占换热器入口激光尾气压力的1.4%;与不加换热器相比,加入高翅管换热器后的引射器混合室入口压力降低了12.95%,压力恢复系统的效率得到了提高。

In order to improve the efficiency of the pressure recovery system (PRS) of high energy chemical laser, a high-fin heat exchanger was designed and manufactured. Instead of the common non-integral finned tubes, copper tubes with integral screwed high fins were adopted.The copper tubes were in staggered arrangement and were forced water-cooled.The heat exchanger was integrated in a chemical laser system and was then tested. Comparative analysis was performed to the efficiency of PRS with and without heat exchanger.The flow resistance of heat exchanger is found to decrease when background pressure increases from 4.03 kPa to 9.366 kPa. When background pressure is 9.366 kPa, flow resistance is 0.133 kPa,which only accounts for 1.4% of the pressure at heat exchanger entrance.Compared with that of PRS without heat exchanger,the pressure at the mixing chamber entrance of PRS with heat exchanger decreases 12.95%,which suggests that the efficiency of PRS is improved with the help of heat exchanger.