喷雾火焰中液滴尺寸的测量及研究

MEASUREMENT AND PREDICTION OF THE DROPLET SIZE IN SPRAY FLAME

一、引言 为了从理论上计算预报喷雾火焰中的液滴尺寸,研究者们提出许多描述喷雾中液滴的蒸发、着火和燃烧的模型。这些模型大致可分两类:一类是修正后的经典模型,以单个油滴为分析对象,其蒸发模型是液滴尺寸的减小遵从直径平方规律;另一类是以液滴群为对象,考虑液滴之间的相互作用,从而列出一系列数理方程。

A simple droplet evaporation model was presented to predict the droplet size change from igniting to disappearing. On the basis of laser diffraction measurement, a new signal processing method was developed to remove the effect of luminous flame, and the size distribution of droplets in spray flames was measured successfully by using Malvern Analyzer. Experiment results were discussed. By comparison, the experimental value agrees well with the calculated value