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


BV_SectorMaritimo2015

Ingenieros Navales

Multinational wants to recruit a Sales Engineer for Service Marine market in the Marine Division. He/she will be responsible for developing this business and selling services (service agreements) to our Customers (Shipowners, Repair Shipyards and Power Plants), with special focus on key Accounts, in the Marine & Diesel Industry, both for Spain and Portugal.   […] La entrada Sales Engineer – Madrid se publicó primero en IngenierosNavales. [...]

Empresa ubicada en Vigo con más de 60 años de experiencia en el Mantenimiento de Centrales de Generación (Hidroeléctrica, Cogeneración, etc.) especializados en el Mantenimiento y Reparación de equipamiento mecánico y eléctrico (Turbinas hidráulicas, Generadores, Cuadros y Automatismos, etc.) busca Ingeniero/a para su Oficina Técnica Naval.   Responsabilidades – Desarrollo de proyecto básico de un […] La entrada Ingeniero Oficina Técnica – Vigo se publicó primero en IngenierosNavales. [...]

Navantia Seanergies, la división de Energías Verdes de Navantia, entregó el pasado martes 14 de mayo, su primer proyecto en el astillero de Puerto Real desde su nacimiento como marca The post Navantia Seanergies entrega a Ocean Winds la primera subestación jacket para el parque eólico marino Îles d’Yeu et Noirmoutier first appeared on Revista […] La entrada Navantia Seanergies entrega a Ocean Winds la primera subestación jacket para el parque eólico marino Îles d’Yeu et Noirmoutier se publicó primero en IngenierosNavales. [...]

Los Dispositivos de Peces (FADs, de sus siglas en inglés Fish Aggregating Devices) son herramientas empleadas por la industria atunera en su labor de pesca, por su capacidad de concentrar The post Nuevos materiales biodegradables para una pesca de atún tropical más sostenible first appeared on Revista Ingeniería Naval. La entrada Nuevos materiales biodegradables para una pesca de atún tropical más sostenible se publicó primero en IngenierosNavales. [...]