Aplicação de resultados de escala real no projeto de hélices de embarcações fluviais. / Full scale measurements results applied on propeller design for inland ships.

AUTOR(ES)
DATA DE PUBLICAÇÃO

1997

RESUMO

This work shows the results of a series of measurements of propulsive performance of a push-tow in the Araguaia river, with a 448kW twin-screw pusher and two 530t barges. During the measurements the pusher was fitted with two different types of propellers: firstly with a more conventional B-Troost one and later with a Kaplan ducted propeller. The full scale results were analyzed by using results of towing tank tests in order to find out the problems and identify the best procedures for the design of propellers of inland vessels. Taking into consideration the operational characteristics of heavily loaded blades of inland vessel propellers, it has been proposed a differentiated treatment compared to that usually applied on conventional marine propellers. At the end, it was verified that there exist good methods of estimating push-tow resistances, but there are problems in estimating the propulsive coefficients, and these influence decisively the quality of inland propeller design. Regarding the blades geometry of the propeller, it was concluded that inland propellers should have small diameters, great expanded area ratios, thicker blade sections, especially in the tips, no skew and no rake. The analysis showed, also, the advantages of the ducted-propellers in inland vessels, as well as it verified that the propeller systematical series can be used successfully for the selection of such propellers.

ASSUNTO(S)

medições measurements hélice propellers navegação fluvial maneuvering propulsão inland navigation propulsion manobras

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