hydrodynamics of tidal stream energy devices with two rows of blades
Post on 26-Feb-2016
61 Views
Preview:
DESCRIPTION
TRANSCRIPT
Hydrodynamics of tidal stream energy devices with two rows of blades
Peter JohnsonPhD student, UCL Mechanical engineering, andLecturer, 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 JohnsonPhD student, UCL Mechanical engineering, andLecturer, 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
Guy cable
Guy cable
cable
cable
cable
cable
SupportColumn
Generator
θ
Fn
Ft
Fn
Ft
sinnFN
sinnFN
2 m
0.5
m
chain
wheel
shaft
shaft
blade
trackSlider
Aluminium plate
Predictions
W
2R
Clockwise:
Θ = 0.5
Clockwise:
Θ = 0
FnFt
M
y
x
R
Definitions
2D vortex model results
Pow
er c
oeffi
cien
t
Blade speed
o – Moonraker, + – Darrieus
2D point vortex model using empirical blade data
Blade(carbon fibre)
chain
wheelAttachment link
S/steel shaft
Nylon pads (rapid prototyped)
Aluminium plates
VideoPII_001.wmv
Distributed load
Strain gaugesBending member
Blade(hollow carbon fibre shell)
TracksTracksBlade
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 batteriesBending 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
W
2R
Clockwise:
Θ = 0.5
Clockwise:
Θ = 0
FnFt
M
y
x
R
Recap: definitions
Normal force
Normal force
Normal force
Summary of results for force normal to blade’s motion, Fn
Data here is for results with 3 blades
Tangential force; 6 blades
Tangential force; 6 blades
x – experimento – vortex model (infinite blades) – vortex model (finite blades) for 6 blades
6 blades
Tangential force; 3 blades
Track
wheelscarriage
TrackNo 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
ideal practical
Cable-tie extended
3 blades
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 )
Results: Fourier fitting
top related