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激光活塞热负荷模拟实验需将高斯光束调制成按特定光强分布的多个同心光环,为此提出了基于有限元(FE)分析的激光热负荷光强分布反求设计思想。应用最初设计的整形器对有限元模型进行校核,在合理的范围内调整边界条件参数和活塞材料热物性参数,使模拟结果与实验结果吻合;对于校核后的有限元模型,通过调整光强分布和加载条件以接近目标温度场,从而获得整形器优化设计方案。基于上述方法可实现由目标温度场反求设计出光场分布。研究表明,采用数值模拟方法进行研究,可大幅度缩短整形器设计周期、降低设计费用,并起到虚拟实验的作用,从而提高了热负荷实验的可控性和可预见性。
The laser piston thermal load simulation experiment needs to modulate the Gaussian beam into a plurality of concentric rings with a specific light intensity distribution. Therefore, the inverse design of the laser thermal load light intensity distribution based on the finite element (FE) analysis is proposed. The original design shaper was used to check the finite element model. The boundary condition parameters and the thermophysical parameters of the piston material were adjusted within a reasonable range. The simulation results were in good agreement with the experimental results. For the verified finite element model, Strong distribution and loading conditions close to the target temperature field, to obtain the shaper optimization design. Based on the above method, it is possible to design a light field distribution reversely from the target temperature field. The research shows that the numerical simulation method can greatly reduce the design cycle of the shaper, reduce the design cost and play the role of virtual experiment, which improves the controllability and predictability of the thermal load experiment.