Absolute concentration measurements inside a jet plume using video digitization
- 作者：Vauquelin ; O.
- 关键词：Plume ; turbulent diffusion ; concentration ; digitization ; gray level
- 刊名：Atmospheric Environment
- 出版年：1996
- 期刊代码：11_13522310
- 类别：env
- 出版时间：May, 1996
- 卷：30
- 期：9
- 页码：1523-1528
- 文件大小：356 K
摘要
An experimental system based on digitized video image analysis is used to measure the local value of the concentration inside a plume. Experiments are carried out in a wind-tunnel for a smoke-seeded turbulent jet plume illuminated with a laser beam. Each test is filmed, subsequently video images are digitized and analysed in order to determine the smoke absolute concentration corresponding to each pixel gray level. This non-intrusive measurement technique is first calibrated and different laws connecting gray level to concentration are established. As a first application, concentration measurements are made inside a turbulent jet plume and compared with measurements conducted using a classic gas analysis method. We finally present and discuss the possibilities offered for the measurements of absolute concentration fluctuations.