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:
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 ?
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
blade speed water speed relative speed drag lift Guy cable Sea Bed Guy cable cable Support Column Generator
θ FnFn FtFt FnFn FtFt
2 m 0.5 m chain wheel shaft blade track Slider Aluminium plate
W 2R Clockwise: Θ = 0.5 Clockwise: Θ = 0 FnFn FtFt M y x R Definitions
2D vortex model results
Power coefficient Blade speed o – Moonraker, + – Darrieus 2D point vortex model using empirical blade data
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?
Carbon fibre blade 61 mm Microlog main PCB Microlog bluetooth transceiver 9 mm Microlog filter circuit (inside blade) Terminals
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
Nano batteries Bending member Microlog PCBs Charging circuit Filled with Silicone Dowel pins Epoxy escape holes Filled with epoxy Flush dowel pins
QinetiQ Plc., Naval testing facilities, Haslar, near Portsmouth, UK
Results: Fourier fitting (1/3)
Results: Fourier fitting
W 2R Clockwise: Θ = 0.5 Clockwise: Θ = 0 FnFn FtFt M y x R Recap: definitions
Summary of results for force normal to blades motion, F n Data here is for results with 3 blades
Tangential force; 6 blades
x – experiment o – vortex model (infinite blades) – vortex model (finite blades) for 6 blades 6 blades
Tangential force; 3 blades
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
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.
Thank you… and questions www.londonmarinepower.co.uk (from Kaz: www.londonmarinepower.co.uk.nyud.net )