化学氧碘激光器光腔边界层的被动控制方法实验

针对化学氧碘激光器(Chemical Oxygen-Iodine Laser, COIL)光腔内边界层的被动控制方法,设计了三种实验件。光腔的上下壁板是可拆卸的,可以更换不同的实验件,以此比较边界层的控制效果。实验结果表明:开槽板、主流引射缝和开孔板在对光腔边界层的控制上都取得了一定的效果,改善了光腔特别是光腔后半部分的压力分布。在一定范围内,增加边界层的抽气量,可以进一步减小边界层厚度,降低光腔压力,同时提高COIL出光功率,但是当抽气量过大时,反而会降低出光功率。三种实验件中,主流引射的方式对抽气量最敏感,当抽气量增加至5%时,COIL出光功率已经明显下降;开孔板对抽气量不太敏感,抽气量从1%增加至7%,对COIL出光功率的影响并不明显。

Experimental study on the passive boundary layer control methods of chemical oxygen-iodine laser cavity

Aiming at the passive boundary layer control methods of COIL (chemical oxygen-iodine lase) cavity, three types of experiment rigs were designed. The upper and bottom walls of laser cavity are removable, so the boundary layer control effect with different experiment rigs can be compared. The experiment results indicate that the thickness of boundary layer in laser cavity can be reduced by both slotted wall, mainstream ejected slot and perforated wall. The pressure distribution in cavity, especially in the latter of cavity, is improved. The boundary layer thickness can be reduced further by increasing the sucking rate in a proper range, meanwhile the cavity pressure can be dropped and the COIL power can be increased. But the COIL power also can be dropped with the overlarge sucking rate. Among the three experiment rigs, the mainstream ejected slot is the most sensitive to sucking rate, that when the sucking rate improved to 5%, the COIL power drops obviously. The perforated wall is the most insensitive to sucking rate, and the COIL power has little change while the sucking rate improved from 1% to 7%.