Abstract
A cold-flow experiment was conducted to analyze the effect of varying the impingement distance of like-doublet injectors. An initial experiment was carried out to determine the jet breakup length as a function of jet velocity. The results agreed well with existing empirical breakup length correlations. The like-doublet test program comprised a combination of three impingement angles, three jet velocities, and three different lb/li ratios. It was found that the lb/li ratio has a profound effect upon the resulting spray and atomization quality. For lb/li ratios greater than one, the impingement process produces a flat sheet that disintegrates into waves of ligaments and droplets. Larger impingement angles and jet velocities correspond with smaller droplet sizes and greater spray uniformity. An unsteady sheet forms when the lb/li ratio is equal to one. For lb/li less than one, no sheet is formed. Instead, most of the droplets formed from the disintegration of the jet pass through the impingement point. Occasional droplet collisions occur at the impingement point producing a shower of small droplets down the centerline of the spray. Also, the atomization frequency was found to be proportional to the jet velocity but independent of both the impingement angle and lb/li ratio.
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