基于二维激光支持爆轰波模型的光船工作过程数值模拟

Numerical simulation of the operating process based on 2D LSD-wave for the lightcraft

以Raizer建立的一维激光支持的爆轰波模型为基础,根据激光推进中焦点区内入射激光强度的分布情况,建立了二维激光支持的爆轰波模型。在相同的激光入射功率下,分别采用球面激光支持的爆轰波模型、球冠激光支持的爆轰波模型和二维激光支持的爆轰波模型与流场控制方程组进行耦合求解,探讨了焦点区内激光强度分布不同时的光船推进性能。结果表明,在吸收相同激光能量的条件下,三种模型所得推力曲线和冲量耦合系数在误差范围内均吻合,说明能量在焦点区的分布对光船推进性能的影响不大。

Two-dimensional laser-supported detonation （2D LSD） wave models based on 1D LSD wave proposed by Raizer were built, in which the distribution of the incident laser intensity in the focal area of lightcraft was considered. Then the sphere LSD wave, semi-sphere LSD wave and 2D LSD wave, which coupled with the fluid controlled equations, were solved respectively under the same incident laser power. The propulsive performances of lightcraft which had different distribution of the incident laser intensity in focus area were studied. The results show that the thrust and impulse coupling coefficient obtained from the three models are accordant under the same laser absorptive energy. It implies that the propulsive performance of the lightcraft is not greatly affected by the distribution of energy in the focal area.