连续激光内通道传输的弱可压缩流模型
Weakly compressible fluid model to study thermal effects on laser propagating in closed tube
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摘要: 分析了激光在气体中传输时采用等压近似线性方程求解流场密度分布的优缺点，在高低速流场统一计算模型的基础上提出了基于压力原变量的分步求解的弱可压缩流计算模型，并分析了该模型的特点。采用该模型结合标量衍射理论对连续激光在封闭充气管道中受到的气体热效应影响进行了数值仿真。仿真结果与实验结果的对比表明，弱可压缩流计算模型能更精确地反映非自由边界热对流对气体密度分布的影响，进而反映流场对光束的影响。这说明弱可压缩流计算模型能较好地适应内通道光传输问题的仿真研究。Abstract: The iso-pressure approximation model used in laser propagation in gas medium and its disadvantage under complex border conditions were analyzed. The weakly compressible fluid model based on the Mach uniform method introduced by Peter Wesseling was developed. Using the weakly compressible fluid model and scalar wave equation, a numerical study was carried out for the gas thermal effects on laser propagating in a closed tube full-filled with air. The far-field beam shape at different time were obtained and compared with the experimental ones. The weakly compressible fluid model could be well adapted problems with complex border conditions, which proves that it is more flexible than the compressible fluid model or the iso-pressure approximate model．
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Key words:
- laser propagation /
- aerooptics /
- thermal effects /
- scalar wave equation /
- weakly compressible fluid
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