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By Ning Ren


Knowledge of the initial spray characteristics of sprinklers is critical for fire suppression performance analysis. Although numerous tests and studies have been conducted on fire sprinkler sprays, measurements were mostly conducted in the far-field due to spray diagnostics limitations. Although these far-field measurements are useful for evaluating the ultimate sprinkler performance, they are convoluted by the dispersion process and yield little useful information regarding the initial sprinkler discharge characteristics. With the development of advanced non-intrusive spray diagnostics, high fidelity initial spray measurements are possible, providing sprinkler discharge characteristics which are useful alone for nozzle development or together with analytical tools for prediction of suppression performance. In this study, a laser diagnostic technique based on Shadowgraphy was used to characterize the initial spray for actual fire sprinklers and nozzles having more basic configurations. The shadowgraphs revealed important information on the effect of nozzle geometry on sheet formation (from the injected jet) and sheet fragmentation into drops. Three breakup modes were observed depending on the injection conditions quantifie

Year: 2016
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