直筒形约束对激光烧蚀GAP的冲量耦合性能实验研究

Experimental on the Influence of Straight Cylindrical Constraint on the Impulse Coupling Performance of Laser Ablation GAP

论文针对反射式烧蚀模式下,毫米尺度直筒形约束对GAP工质的冲量耦合性能影响进行了实验研究,设计加工了直筒直径与光斑直径比值在区间1.2~3%直筒长度与激光光斑之比在区间2~5的约束,实验结果表明:直径是影响直筒约束作用效果的重要因素,较小约束直径下,GAP工质的冲量耦合性能严重下降,随着直筒约束的直径增大,取得冲量耦合系数极大值对应的激光功率密度增大,在直筒直径达到光斑直径两倍时,能取得最佳冲量耦合系数;约束长度对提高冲量耦合性能总体表现出了积极的影响,随着约束长度的增长,其效能呈现出先增长然后下降的趋势,在约束长度达到光斑直径4倍时,GAP工质的冲量耦合系数提高了14.8%。

In this paper,the influence of cylindrical confinement on the impulse coupling performance of GAP is studied experimentally. The cylindrical confinement whose ratio of cylindrical diameter to spot diameter is 1.2~3 is manufactured. Based on the experimental determination of the optimal cylindrical diameter,the confinement of the ratio of cylindrical length to laser spot is 2~5 in the interval. The experimental results show that diameter is an important factor affecting the confinement effect of straight cylinder,and smaller confinement diameter will seriously reduce the impulse coupling performance of GAP working fluid. With the increase of the diameter of straight cylinder confinement,the laser power density corresponding to the maximum impulse coupling coefficient increases,and the optimal impulse coupling coefficient can be obtained when the diameter of straight cylinder reaches twice the diameter of light spot. The confinement length has a positive effect on improving the impulse coupling performance. With the increase of the confinement length,the efficiency increases first and then decreases. When the confinement length reaches 4 times of the spot diameter,the impulse coupling coefficient of GAP refrigerant increases by 14.8%.