Pre- and post-swirl fins design for improved propulsive performances. Issue 1 (2nd January 2022)

• Record Type: Journal Article
• Authors: Gaggero, Stefano; Martinelli, Mattia
• Is Part Of: Ship technology research. Volume 69:Issue 1(2022)
• Page Start: 31
• Page End: 49
• Publication Date: 2022-01-02
• Subjects: Pre-swirl stators -- post-swirl stators -- design by optimization -- energy-saving devices -- ESD -- CFD -- optimization; Shipbuilding -- Periodicals; 623.82072
• DOI: 10.1080/09377255.2021.1934362
• Languages: English
• ISSNs: 0937-7255

Abstract

ABSTRACT : Pre- and post-swirl fins-based energy-saving devices (ESD) are designed to improve the propulsive performances of a twin-screw ship. To this aim, BEM and RANSE calculations are employed. Depending on the application, a simple actuator disc model (post-swirl) with radially varying load or a combined BEM/RANSE method for self-propulsion prediction (pre-swirl) are required. Both the approaches are included in a framework for a design by optimization, where systematic variations of the ESD geometry are used to explore the design space and maximize the energy-saving effect of the devices. Considering the particularity of the case selected for the study, results show encouraging improvements that reach a promising 5% in the case of the combined action of both devices.