Revista Ingeniería Naval

NÚMERO 5: ABRIL 2016

Ingeniería Naval Académica. ISSN: 2340-4779

Scale effects in open water test results for performance prediction of conventional and unconventional propellers

Contenido:

ITTC’78 Performance Prediction Method is the only existing standard procedure approved by ITTC to carry out predictions of ship performance based in model tests results. It has been successfully applied from 1978 by towing tanks directly or introducing some variations. But it has been explicitly recognized by ITTC that this method must be only applied to conventional propellers and cannot be applied to Unconventional Tip Shape propellers.

This kind of propellers is one of the best options to save energy in marine propulsion. However, as at model scale these improvements are not clearly shown, the lack of a standard procedure to be applicable to this type of propellers reduces in many projects the possibilities to implement energy saving propellers.

In this study a new procedure will be explained in detail going a step deeper in the basic principles of viscous effects depending of the local section Reynolds number.

The validation work here presented confirms that ITTC’78-PPM is not useful to predict propulsion characteristics of unconventional tip shape propellers and that present proposed method predicts with reasonable accuracy propulsion characteristics of conventional and unconventional propellers, monoblock or CPP type and it is repetitive and easy to implement.

Keywords: Propellers, performance prediction, open-water tests, model to ship extrapolation, unconventional tip blade shape.

pdf [EN] – html [EN]


Redes sociales

Ingenieros Navales

Lunes, 24 Abril, 2017El día 22 de junio se celebrarán las Juntas Generales Extraordinarias de la Asociación de Ingenieros Navales y Oceánicos de Españ [...]

Lunes, 24 Abril, 2017Habiéndose iniciado el periodo de presentación de la declaración de IRPF del año 2016, ponemos a tu disposición unas notas inform [...]

Viernes, 21 Abril, 2017Ya está abierto el plazo de presentación de resúmenes para el 56 Congreso de Ingeniería naval e Industria Marítima que se celeb [...]

Jueves, 20 Abril, 2017Ambas instituciones se comprometen a cooperar en actividades de formación cualificada de los colegiados, los universitarios y la [...]