固体推进剂光学参数对激光点火延迟时间的影响

Effect of optical parameters of solid propellant on the laser ignition delay

给出了固体含能材料主要光学参数的定义和测量方法 ,考察了推进剂光学参数对激光点火中点火延迟时间的影响 ,着重分析了吸收系数偏小带来的光学深度吸收 ,以及由此引起的理论与实际点火延迟的差异 ,并建立转换系数予以描述。以NEPE推进剂为例 ,对不同热流密度下点火延迟时间的理论估算表明 ,光学参数及由光学参数决定的深度吸收对激光点火延迟时间的影响不可忽略。

The optical parameters of solid energetic materials are defined and their measuring methods introduced.Both the variation of the parameters with laser wavelength and their effect on the laser ignition delay time were tested.The in depth absorption of radiation caused by lower absorption coefficient is analyzed which would lead to significant difference of ignition delay between theoretical and experimental results.Convertion coefficient is defined to estimate the differences,Theoretical estimations of ignition delay time of NEPE propellant show that the effect of the optical parameters and the in depth absorption determined by optial parameters on the laser ignition delay can not be disregarded.