Abstract
One of the phenomena associated with the planing hull operation is the formation of a spray sheet. In model tests the water surface tension stabilizes the spray sheet and a “spray blister” forms. In addition to being an interesting hydrodynamic phenomena, the spray blister provides a trace of the spray trajectory. As a first approximation, the spray sheet trajectory is modeled as that of a projectile in the presence of gravity. Dimensional analysis of the spray sheet results in a modified Weber number or surface tension parameter STR based on the maximum blister height. Analysis of the spray blister measurements of Savitsky and Breslin (1958) results in a family of STR curves which show the limiting case when blister breakup occurs. Using the resultsof trajectory analysis, it is possible to show that STR = constant/ V 4. A scaling law is derived which enables the collapse of the data into a single curve representing the STR values at a given speed. This analysis forms the basis for understanding the behavior of the spray sheet.
Published Version
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