吹气抑制气体热效应时管道结构对光传输的影响
Effect of tube structure on beam propagation when depressing thermal effect by blowing
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摘要: 采用吹气抑制气体热效应对光传输的影响时，管道结构会对内通道流场分布产生作用从而影响光传输质量。对比研究了沿几何尺寸相同、光路总长相等的U形和Z形管道轴向吹气的情形。仿真过程中，联合求解标量衍射方程和N-S方程,计算管道对吹气流场的影响以及流场对光束的影响，以远场光斑的峰值功率密度点、能量分布重心点位置的偏移以及Strehl比和b值的变化反映光束质量。结果表明:不吹气时，管道结构对流场的影响远小于气体吸热对流场的影响；吹气时，管道内气体流速较大，管道结构对流场分布的影响比较明显；吹气时，U形管道对光束的影响比Z形管道对光束的影响要小。Abstract: The inner flow field’s influence on beam was simulated to study how to design the tube’s inner structure when blowing non-absorbing gas in them to depress thermal-effect of air. The beam-gas-effect model was adopted as well as a Z-like tube and a U-like tube were used in comparison. The results showed different inner structure of tube will produce different influence on beam. The U-like tube could hold the flow field smoother and had little influence on beam than the Z-like tube under the same blowing condition. This was because its flow velocity changed little in direction than the other one. However, the Z-like tube was a little better than the U-like tube when without blowing.
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Key words:
- beam propagation /
- blowing /
- tube structure /
- scalar diffraction /
- n-s equations /
- simulation
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