AquaBuOY scale 1:10 - Energinet.dk

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Parallel research projectsTesting of the Hose-pumpDynamic testing of the hose-pump was realized at a test rig build at AEAT in the UK, with the support fromthe UK Carbon trust and Dunlop as lead partner. Three different hose constructions were tested. The resultsdemonstrated an efficiency of around 75% in converting mechanical power into hydraulic power. The testsalso showed that fatigue was a problem that needed further research in order to construct hoses withsufficient long operating life. The test showed that the construction induced rotation that after a few monthscaused failure of the hose at its termination. A principle to reduce the rotation by adjusting the applied anglesof reinforcement in different layers of the hose was proposed and incorporated in the design.Hose being tested at the test rigThe theory for the pump regarding flow and pressure for different strokes and periods was verified. Andfatigue tests followed.Dynamic test rig for testing the hose pump – AEATInitially for the 1:10 project the PTO was proposed to be composed of similar rubber hoses – produced byFesto Practical considerations and detailed design regarding these small hoses however revealed that evenif they in theory could provide the required damping, incorporating two opposing sets within the length of theacceleration tube was not possible. Further the flow resistance through the standard fittings would generateexcessive flow losses and make the power measurements difficult without additional measurementequipment. Sea testing of hoses was therefore postponed to larger scale testing.11
1:50 Scale Experiment HMRC CorkTo verify the performance and optimize the AquBuOY Finavera/AquaEnergy was funded through the Irishgovernment Sustainable Energy Ireland SEI, to conduct 1:50 scale testing at HMRC, Cork, Ireland.The testing and preparation of result took place in January - March 2007. The model tests helped calibrateand validate the numerical model developed by Ramboll. Further the principles of the PTO for experimentaltesting was changed from hydraulic to a mechanic system including springs and friction. The combination ofsprings and friction turned out to provide very similar characteristics as the forces from the hose-pumps. Itwas agreed to incorporate this PTO system in the 1:10 scale testing also.The 1:50 scale model ready for testing at HMRCThe main results from the 1:10 scale model experiments were data produced on performance for a widerange of sea states and damping settings. The numerical model was improved by incorporating of moreaccurate hydrodynamic parameters for the combined float and tube geometry as well as drag resistancemeasured experimentally.The comparison between measured and calculated energy production showed an overall good agreement.The numerical model was transferred from Ramboll to Finavera as part of this project to be used in furtheroptimization an evaluation. The results are described in a confidential report as part of the SEI project.12
Page 1 and 2: AquaBuOY scale 1:10Test in Nissum B
Page 3 and 4: Introduction:This R&D project invol
Page 5 and 6: Scope and ObjectivesooooTo build a
Page 7 and 8: Choice of end-stop solution the by-
Page 9 and 10: Methodology used installing of the
Page 11: Results and conclusionThe 1:10 scal
Page 15: References:[1] Energi från havets

AquaBuOY scale 1:10 - Energinet.dk

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