An Exploratory Study on the Working Principles of Energy Saving Devices (ESDs)
Author Dang, J., Chen, H., Dong, G., Ploeg, A. van der, Hallmann, R. and Mauro, F
Title An Exploratory Study on the Working Principles of Energy Saving Devices (ESDs)
Conference/Journal Greenship 2011, Wuxi, China
Month October
Year 2011

A new Joint Industry Project (JIP) has been initiated recently by MARIN, called ESD-JILI (机理), looking into the working principles and scale effects on Energy Saving Devices (ESDs).
Three ESDs have been chosen for the investigations in the first phase. They were a preduct with a supporting stator in the duct, a pre-swirl stator with asymmetric blade design and Propeller Boss Cap Fins (PBCF). Measurements of forces and moments on all components of the ESDs have been carried out in selfpropulsion model tests with dedicated sensors. Particle Image Velocimetry (PIV) technique has been used in the investigation of the detailed flow around the ESDs. In order to investigate the scale effects in model tests, a fullscale wake field was approximated by a ‘smart ship model’. Computational Fluid Dynamics (CFD) calculations were carried out both for designing the smart ship model and also for the detailed flow around the ESDs. Some findings and fundamental issues on scale-effects of the ESDs are addressed in this paper.

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October 10, 2011
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