稠液雾对激光散射液滴尺寸测量影响的试验研究

EXPERIMENTAL STUDY OF THE EFFECT OF DENSE SPRAY ON DROP SIZE MEASUREMENT BY LIGHT SCATTERING TECHNOLOGY

本文研究了稠液雾对激光散射液滴尺寸测量的影响。采用马尔文激光测雾仪 ,用五个内混合空气雾化喷嘴沿激光束排列来组成稠液雾 ,由此得出多重散射修正系数的数据。通过回归分析得出经验方程 ,该方程表示修正系数是遮光率 ( OBS) ,稀液雾状况下的索太尔平均直径 SMDo和稀液雾状况下的 Rosin- Rammler分布的液滴尺寸分布参数 No 的函数 ,该经验方程可以非常好地概括试验数据 ,可以在实际试验中用于对高遮光率下得出的马尔文测雾仪数据进行修正。

The effect of dense spray on drop size measurement by light scattering technology was studied by using Malverm instrument with five duplicated internal mixing airblast atomizers aligned with laser beam.The correction factor data for multiple scattering were obtained.By regression analysis,an empirical equation was obtained which correlated the correction factor as a function of obscuration(OBS),Sauter Mean Diameter under dulite spray condition SMD o and drop size distribution parameter for Rosin Rammler distribution under dilute spray condition N o. The experimental data showed definitely that the correction factor is not only a function of OBS,SMD o,as proposed by Lee Dodge,but also is a function of N o.The correlation fits the experimental data very well,and can be used for practical purposes to correct the data from Malvern drop sizer at high obscuration conditions.