抛物型激光推进光船构型设计与特性分析

Design of configuration and analyse of properties for parabolic laser propulsion lightcraft

关键词:  激光推进  LSD波  光船  耦合系数  数值仿真

Key words:  Laser propulsion  LSD wave  Lightcraft  Coupling coefficient  Numerical simulation

摘要:

以轴对称Navier-Stokes方程组为基础,将球面激光支持的爆轰波模型与流场控制方程组进行耦合求解,数值模拟了抛物型激光推进光船的工作过程。计算中对激光支持的爆轰波阵面进行实时追踪,以获得激光能量吸收源项,同时采用Gupta建立的高温平衡空气模型来计算工质的热力学参数和输运特性。并用所发展的数值模拟程序研究了不同构型设计光船的推进性能。最后分析了流场流动特性和推力生成机制。结果表明,推力面离焦点距离越近,光船获得的冲量耦合系数越大,而峰值推力越小。

Abstract:

Based on sphere laser-supported detonation(LSD) wave,the axial symmetric Navier-Stokes equations were used to simulate the work process for parabolic laser propulsion lightcraft.In order to obtain the absorptive laser energy,the surface of the LSD wave was traced,while equilibrium air in high temperature proposed by Gupta was used to calculate the thermodynamic and transport properties in the computation.Then the propulsive performances of the different configuration lightcrafts were studied by the numerical simulation program developed.Finally,the fluid properties and the production of thrust were analyzed in detail.The results show that if the thrust plane is closer to the focus,the impulse coupling coefficient is larger,while the peak value of the thrust is smaller.