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Hydrodynamics of tidal stream energy devices with two rows of blades Peter Johnson PhD student, UCL Mechanical engineering, and Lecturer, Nazarbayev University.

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Presentation on theme: "Hydrodynamics of tidal stream energy devices with two rows of blades Peter Johnson PhD student, UCL Mechanical engineering, and Lecturer, Nazarbayev University."— Presentation transcript:

1 Hydrodynamics of tidal stream energy devices with two rows of blades Peter Johnson PhD student, UCL Mechanical engineering, and Lecturer, Nazarbayev University School of Engineering with Adam Wojcik and Kevin Drake, UCL Mechanical Engineering ?

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3 Hydrodynamics of tidal stream energy devices with two rows of blades Peter Johnson PhD student, UCL Mechanical engineering, and Lecturer, Nazarbayev University School of Engineering with Adam Wojcik and Kevin Drake, UCL Mechanical Engineering

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6 blade speed water speed relative speed drag lift Guy cable Sea Bed Guy cable cable Support Column Generator

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8 θ FnFn FtFt FnFn FtFt

9 2 m 0.5 m chain wheel shaft blade track Slider Aluminium plate

10 Predictions

11 W 2R Clockwise: Θ = 0.5 Clockwise: Θ = 0 FnFn FtFt M y x R Definitions

12 2D vortex model results

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15 Power coefficient Blade speed o – Moonraker, + – Darrieus 2D point vortex model using empirical blade data

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17 chain Attachment link Aluminium plate Nylon pads (rapid prototyped) Aluminium plate Screws Blade Wheel (bearing) S/steel shaft

18 Blade (carbon fibre) chain wheel Attachment link S/steel shaft Nylon pads (rapid prototyped) Aluminium plates

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21 Video PII_001.wmv

22 Blade (hollow carbon fibre shell) Steel cantilever insert Distributed load Strain gauges at root of cantilevered insert blade Tracks Distributed load Strain gauges Bending member Blade (hollow carbon fibre shell) Tracks Blade (hollow carbon fibre shell) Blade instrumentation concepts

23 Distributed load Strain gauges Bending member Blade (hollow carbon fibre shell) Tracks Blade (hollow carbon fibre shell) Blade instrumentation concepts How to record the signal from the strain gauge?

24 Carbon fibre blade 61 mm Microlog main PCB Microlog bluetooth transceiver 9 mm Microlog filter circuit (inside blade) Terminals

25 Polished surfaces for strain gauges Holes for cables Holes for dowel pins 18 mm Junction board Stainless steel rod Dual strain gauge Microlog main PCB

26 Nano batteries Bending member Microlog PCBs Charging circuit Filled with Silicone Dowel pins Epoxy escape holes Filled with epoxy Flush dowel pins

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28 QinetiQ Plc., Naval testing facilities, Haslar, near Portsmouth, UK

29 Calibration

30 Results: Fourier fitting (1/3)

31 Results: Fourier fitting

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33 W 2R Clockwise: Θ = 0.5 Clockwise: Θ = 0 FnFn FtFt M y x R Recap: definitions

34 Normal force

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37 Summary of results for force normal to blades motion, F n Data here is for results with 3 blades

38 Tangential force; 6 blades

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41 x – experiment o – vortex model (infinite blades) – vortex model (finite blades) for 6 blades 6 blades

42 Tangential force; 3 blades

43 Track wheels carriage Track No Track tangent Centrifugal force Cable-tie (slack) Tie clip (tight) Cable-tie connects trailing edge of blade to chain, to limit pitching during corners No Track tangent Centrifugal force idealpractical Cable-tie extended 3 blades

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47 Many thanks to … Kevin Drake, Adam Wojcik, Neil Collins, Richard Winn, Dan Fone, Peter Kelly, Sinan Hasan, Savvas Achilleos, Ian Eames, Christian Klettner, Andre Nicolle, Christian Jonsson, Tim McDonald, Tristan Smith, Ben Tompsen, Chris Pyke, Mike Johnson, Joachim Baumgaertner, And support from QinetiQ Plc., Norwin Electrics, Ashley Power Ltd., JRD Ltd., NCGE, NESTA, EPSRC, UCL.

48 Thank you… and questions (from Kaz: )

49 Results: Fourier fitting


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