CAJ | 학술논문

针对大口径宽波段激光发射通道密封防护较难的问题,提出了正压净化通风密封方法.该方法利用送入内通道的干燥洁净的净化气流,排出原有空气并充满内通道,基于正压原理阻挡外界空气和微粒,实现发射通道的密封.借助计算流体力学软件Fluent对激光发射内通道的正压通风流场进行了连续相和离散相的数值模拟,发现正压通风方法形成的正压净化气流不仅可以阻挡外界空气,而且在小于4.71E-3 kg/m3的颗粒浓度范围内,净化气流对空气中各种粒径的尘埃颗粒也起到很大阻挡作用.另外,通过分析流场的气体折射率的非均匀分布发现,对于0.8~10.6μm波段范围的激光,正压通风引起的光程差约为0.32μm.正压通风实验的测量结果显示,颗粒浓度与仿真曲线变化趋势基本一致,证明了正压通风方法的有效性.
침대대구경관파단격광발사통도밀봉방호교난적문제,제출료정압정화통풍밀봉방법.해방법이용송입내통도적간조길정적정화기류,배출원유공기병충만내통도,기우정압원리조당외계공기화미립,실현발사통도적밀봉.차조계산류체역학연건Fluent대격광발사내통도적정압통풍류장진행료련속상화리산상적수치모의,발현정압통풍방법형성적정압정화기류불부가이조당외계공기,이차재소우4.71E-3 kg/m3적과립농도범위내,정화기류대공기중각충립경적진애과립야기도흔대조당작용.령외,통과분석류장적기체절사솔적비균균분포발현,대우0.8~10.6μm파단범위적격광,정압통풍인기적광정차약위0.32μm.정압통풍실험적측량결과현시,과립농도여방진곡선변화추세기본일치,증명료정압통풍방법적유효성.
In view of the problem that the seal protection for a laser emission system with large-diameter and wide-band is very difficult, the purification positive pressure ventilation seal method has been put forward. This method was to achieve the purpose of sealing by exhausting the original air and making the pipe full of purified and dry and clean air, so the air and particles from outside will be resisted based on the positive pressure principle. For the flow field of the positive pressure ventilation in laser emission pipe, the numerical simulation of the continuous phase and discrete phase has been made by the CFD software-Fluent, found that the purified positive pressure airflow formed by the positive pressure ventilation could resist the air backflow from outside, but also made a barrier function for the dust particle with kinds of sizes in the air, when the concentration was less than 4.71E-3 kg/m3. In addition, this paper found that the positive pressure ventilation flow caused a 0.32μm optical path difference when laser's band was within 0.8 -10.6μm,based on the analysis of refractive index in the pipe. Measurement results from the positive pressure ventilation experiments show that trends of vary of particle concentration and simulation curve are basically consistent, which demonstrates the effectiveness of the method of positive pressure ventilation.