Positive seal in large-diameter and wide-band laser emission pipe

	Positive seal in large-diameter and wide-band laser emission pipe
	Chen, W.-T.; Y.-G. Gao and S. Shao
	2015
发表期刊	Guangxue Jingmi Gongcheng/Optics and Precision Engineering
卷号	23 期号:8 页码:2236-2242
摘要	To prevent dust and moisture to enter the laser emission pipe of a high-energy laser emission system with large-diameter and wide-band, a positive pressure ventilation seal method for the laser emission pipe is proposed. This method uses purified, dry and clean air to exhaust original air, and allow a positive pressure flow on an emission port to resist the air diffusion into the laser emission pipe from outside and to achieve the sealing for the pipe. The numerical simulation and analysis for a flow field of the positive pressure ventilation in the laser emission pipe are performed by the CFD software-Fluent, and it shows that the clean air keeps a certain velocity and pressure on the emission port and could form a positive pressure airflow to resist the backflow from outside. For a long wavelength 10.6 m laser, the variation of refractive index in the pipe is estimated to be a magnitude of 10sup-7/sup based on the pressure change, which causes a 1 m optical path difference. The simulation results are experimentally verified and the results show that the velocity varies of interior have nearly no difference, though its' velocity is a litter bigger than that of simulation, and there is a positive pressure airflow with 0.64 m/s. Moreover, the relative humidity of clean air has dropped to 29% from 59%, which basically reaches the design sealing requirements of the positive pressure ventilation system for dust-proof and dehumidification. , 2015, Chinese Academy of Sciences. All right reserved.
文章类型	期刊论文
收录类别	EI
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/56016
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Chen, W.-T.,Y.-G. Gao and S. Shao. Positive seal in large-diameter and wide-band laser emission pipe[J]. Guangxue Jingmi Gongcheng/Optics and Precision Engineering,2015,23(8):2236-2242.
APA	Chen, W.-T.,&Y.-G. Gao and S. Shao.(2015).Positive seal in large-diameter and wide-band laser emission pipe.Guangxue Jingmi Gongcheng/Optics and Precision Engineering,23(8),2236-2242.
MLA	Chen, W.-T.,et al."Positive seal in large-diameter and wide-band laser emission pipe".Guangxue Jingmi Gongcheng/Optics and Precision Engineering 23.8(2015):2236-2242.

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