摘要
尾流场中气泡幕的存在 ,使得对于气泡、气幕的研究成为研究尾流的一个重要途径 ,而在实验室模拟尾流气幕场并对其进行研究是一种简单且行之有效的途径 .研究表明 ,无气泡幕时激光在扩束时比不扩束时的衰减平缓 ,通过气泡幕的激光在有扩束情况下透射光引起的照度大于无扩束时透射光引起的照度 .在一定气体压强下 ,照度随着光阑孔径的增大而增加 ;当光阑孔径小于 4mm ,基本呈线性增加 ,当光阑孔径大于 4mm ,增加较为缓慢 ,并在光阑孔径等于 10mm时接近饱和 .有气泡幕存在时透射光的输出照度大于无气幕时的照度 ,数量级可达 6 9dB ,有气泡幕时的相对标准差是无气泡幕时的 10倍以上 .
Studying the bubbles and bubble screen becomes an important measure of wake investigation due to the presence of bubbles in wakes. Simulating and investigating wake bubble screen in laboratory is a simple and effective way. It is shown, through our investigation, that the attenuation of laser beams expanded is larger than that of beams not expanded and that the illuminations of transmission of dilated beams greater than that of normal beams. The illumination, under certain pressure, will increase linearly or slowly with the accretion of beam windows when it smaller or greater than 4mm, and will approach saturation when it is equal to 10mm. The illuminations of transmission through a film of bubbles is larger with a magnitude of 69 decibel than that of none bubble screen and the relative standard error of illumination,when bubble screen presents,is above 10 times than that when it is absent.
出处
《西安工业学院学报》
CAS
2001年第4期283-287,共5页
Journal of Xi'an Institute of Technology
基金
国防科技重点实验室 (99JS2 6 3 1 ZK180 1)
