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



navantia

aluminios

5

cintranaval

cintranaval

BV_SectorMaritimo2015

Ingenieros Navales

Apply: maría.bazarra.scholar@oceanwinds.com GENERAL DESCRIPTION You will be responsible for assessing the metocean and wind conditions of our future offshore wind farms all over the world oceans. You will work on the development of wind offshore projects, from the very early stage, throughout the design and the final energy yield prediction towards FID. Some of your […] La entrada New job offer: Corporate Meteocean & Energy Assessment Engineer se publicó primero en Ingenieros navales. [...]

Ya se han publicado las bases del proceso selectivo para cubrir 24 plazas del Cuerpo de Ingenieros Navales. El plazo para presentar las solicitudes es hasta el 21 de octubre. En el BOE podéis ver toda la información sobre esta convocatoria. Para la preparación de esta oposición el Servicio de Orientación Profesional al Ingeniero Naval (SOPIN) ofrece […] La entrada 24 Plazas Para el cuerpo de ingenieros navales del Estado se publicó primero en Ingenieros navales. [...]

PROJECT MANAGER – Future Fibres Rigging Systems S.L. Based in Valencia, Alcasser Full time position. Job Description: As a Project manager at Future Fibres, your primary job is to ensure customer satisfaction. The project manager is responsible for receiving rigging orders (projects) from the sales team, and ensuring that they are designed, manufactured, and delivered […] La entrada Future Fibres Rigging Systems is hiring a Project Manager se publicó primero en Ingenieros navales. [...]

QUATTRO FORMACIÓN BUEU, S.L. busca un docente de calderería para impartir un curso de 60 horas para personal que ya está trabajando de caldereros en el sector naval. Requisitos mínimos: Certificado de profesionalidad de calderería Licenciatura, ingeniería, arquitectura, diplomatura o titulación equivalente. Experiencia docente, conocimientos de calderería y estructuras metálicas en el sector naval y […] La entrada DOCENTE DE CALDERERÍA para impartir un curso de 60 horas se publicó primero en Ingenieros navales. [...]