铝粉对固体推进剂羽流红外特性的影响

Influence of aluminum on infrared signature of exhaust plume from solid propellant

为研究铝粉对固体推进剂羽流红外特性的影响,建立了羽流红外传输的计算模型,通过在流场能量方程中引入辐射源项,实现了流场计算与辐射传输的耦合求解。基于欧拉-拉格朗日方法,对考虑后燃化学反应的-气固两相羽流流场进行了计算,使用离散坐标法求解羽流辐射传输方程,得到了羽流红外辐射强度在1000～4500 cm-1范围内的分布情况及辐射强度在近场内的分布云图,与试验数据吻合较好。在羽流近场内能捕捉到辐射特性随流场物性变化的情况,表明耦合求解能提高辐射计算精度。Al2O3能显著提高推进剂羽流的红外辐射能力,羽流辐射强度随推进剂中铝粉含量增加而大幅上升。

To study the influence of aluminum on the infrared signature of exhaust plume from solid propellant,the calculation model for infrared radiation transfer of plume was established.The radiation source item was induced to energy equation,thus the plume flow field and radiation transfer was calculated together.Based on Euler-Lagrange method,the gas-particle plume field with afterburning reaction was calculated;discrete ordinates method was used to solve the radiation transfer equation.The spectral radiation intensity from 1 000~4 500 cm-1 and radiation intensity contours were obtained.The calculation results accord well with the experimental data.The results show that the IR characteristics in the near plume field can be captured varying with the physical characteristics of flow field,which shows that the coupled solution can increase the calculation resolution.Al2O3 particles can significantly increase the radiation intensity of plume from solid propellant.The radiation intensity of plume increases with the increase of aluminum content in solid propellant.