风扇环形外腔产生的正压湍流射流在内腔负压汇流作用下形成锥形风幕流场，将处于流场范围内的气体及粉尘严密封闭起来，使安全生产得到保障。
The tapered windscreen flow field of the fan is composed of the outer ring turbulent jet and the inner sink, which tightly closes gas and dust to ensure the safety production.
提出了一种适用于同轴环形放电结构气体激光器的环形螺旋谐振腔，并给出了理论分析。
For gas lasers a helical resonator with coaxial ring discharge structure is proposed, and the theoretical analysis is given.
本文提出了一种适用于同轴放电气体激光器的环形腔方案，给出了这种腔的设计和光束特性。
A ring resonator scheme suitable for coaxial gas lasers is put forward. The design and the beam propation characteristics in the resonator are given.
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