Experimental measurement of the nearfield longitudinal wake profiles of a high-speed prismatic planing hull

Gray-Stephens, Angus and Tezdogan, Tahsin and Day, Sandy (2020) Experimental measurement of the nearfield longitudinal wake profiles of a high-speed prismatic planing hull. Ship Technology Research. ISSN 0937-7255 (In Press)

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    Abstract

    This study details an extensive investigation into the nearfield longitudinal wake profiles of a high-speed planing hull. Developing a more thorough understanding of the flow in this region is of benefit to the designers of stepped hulls, who are required to determine how the forebody’s wake will intersect with the afterbody. As no experimental data was available within the public domain, a novel small-scale model-testing program was undertaken, measuring Centreline (CL) and Quarter Beam (QB) nearfield longitudinal wake profiles, as well as the resistance, lift and trimming moment of a prismatic hull. The nearfield wake profile was found to exhibit trends in agreement with the findings of previous work investigating the mid and far field wake patterns. The results of this experimental work are provided in full as validation data. Two methods of modelling these profiles, Savitsky’s Wake Equations and the Linear Wake Assumption are then assessed to determine the level of confidence with which they may be used. It was found that Savitsky’s Wake Equations displayed a surprising level of accuracy whereas the Linear Wake Assumption was not valid for the conditions investigated.