功率提取对连续波DF化学激光器腔压的影响

为了研究功率提取对连续波DF化学激光器光腔压力的影响,基于一台小型燃烧驱动连续波DF激光器装置,进行了一系列实验,实验结果显示,随着提取功率的增大,光腔压力逐渐减小。利用一维定常流理论和光腔动力学理论,建立了从燃烧室到光腔出口的一维数学模型,得到光腔压力随比功率的变化关系曲线,取得了与实验较为一致的计算结果,从而给出了功率提取对光腔压力影响的理论解释,同时也验证了数学模型的合理性。数学模型和实验结果同时表明,从光腔中提取功率,光腔压力将有一定程度的下降,将实验条件参量代入模型计算,得出比功率为50J/g时,光腔压力比无功率输出时下降约7.4%。

Effect of Output Power on the Pressure of Cavity in Continuous Wave DF Chemical Lasers

To study the effect of output power on the pressure of cavity in continuous wave(CW)DF chemical lasers,a series of experiments are conducted based on a small-scale combustion-driven CW DF chemical laser.The result shows that greater specific power will result in lower cavity pressure.An algebraic model from combustor to the exit of cavity is constructed by using one-dimension steady state theory and cavity dynamics theory,then the dependence of cavity pressure on specific power is attained.The result is consistent with experiments,so the model explains the effect of output power on the pressure of cavity,and the result indicates that the model is logical.Both the model and experiments show that cavity pressure falls down because of output power.When specific power is 50 J/g,cavity pressure will be reduced by 7.4% theoretically in the experimental condition.