Abstract
An experimental swirl nozzle was developed as a conceptional design of a variable flow nozzle characterized with an improved turn-down ratio with consistent spray performance (Koo and Kuhlman, 1993). The spray characteristics of the experimental nozzle were calibrated using the theoretical performance of swirl-type nozzles. The models of the discharge coefficient, the swath coefficient, and the volume median diameter were assessed by comparing predictions to experimental data. Predicted spray performance from the models correlated rationally with experimental results. Spray characteristics of the experimental nozzle were governed by the theoretical extreme conditions as well as major variables. The lower extreme condition was characterized by unique spray performance in the turbulent flow region. The upper extreme condition was characterized by an increase of spray flow velocity due to the critical limit of air core area. The calibrated models can be applied to the design and development of a variable flow nozzle.
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