Propeller partnership pursues improved propulsion
Pressure streamlines show as computer generated images.
A long term partnership between a propeller manufacturer and a leading university is bringing science to bear on the interaction between hull design, propellers and other hull appendages.
CJR Propulsion is now working with Southampton University’s Fluid Structure Interactions Research Group (FSIRG) to develop accurate design tools to optimise propeller and sterngear technology for improved performance, fuel efficiency and longevity as well as reduced vibration.
Using computational fluid dynamics (CFD), CJR and FSIRG are beginning to analyse and solve problems relating to fluid flows, using numerical methods and algorithms to perform the complex calculations required to simulate the interaction between hull and appendages and the water.
Based in Southampton, CJR Propulsion designs and manufactures high quality shafts, propellers, rudders and other associated sterngear for the marine industry’s leading brands.
Mark Russell, CJR’s managing director said, ‘We have invested heavily in advanced technology and recognise the importance of steering the industry towards a more scientific approach to hull and associated appendage design. We also see the potentially significant commercial gains which can be made through having a better understanding of the underwater environment.’
The joint venture will utilise the UK government backed Knowledge Transfer Partnership (KTP) scheme, which offers post graduate students the opportunity to gain real world experience, whilst delivering commercial value back into the private sector.
Mr Russell added that the project will enable the company ‘to leverage significant value for our clients, who will benefit from the competitive and commercial advantages of addressing these issues.’
The project is now firmly underway and impressive results appear to already be in the pipeline. Simon Lewis, a student at Southampton University who will be supporting the development explains, ‘From our first project, we have gained a far better understanding of the stresses hull appendages have to face below the waterline. This enhanced understanding of the flow around the hull and appendages allows us to significantly reduce the appendage drag, which contributes between 10% to 15% of the overall drag of the craft. That sort of improvement could equate to around a two knot increase in the cruising speed of high speed craft. It is results such as these which show the true potential CFD has in the marine environment.’
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