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 ID: 225547
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Slide1
Hydrodynamics of tidal stream energy devices with two rows of blades
Peter Johnson
PhD student, UCL Mechanical engineering, andLecturer, Nazarbayev University School of Engineeringwith Adam Wojcik and Kevin Drake, UCL Mechanical Engineering
?Slide2Slide3
Hydrodynamics of tidal stream energy devices with two rows of blades
Peter Johnson
PhD student, UCL Mechanical engineering, and
Lecturer,
Nazarbayev University School of Engineeringwith Adam Wojcik and Kevin Drake, UCL Mechanical EngineeringSlide4Slide5Slide6
blade speed
water speed
relative speed
drag
lift
Guy cable
Sea Bed
Guy cable
Guy cable
Guy cable
cable
blade
blade
cable
blade
blade
cable
cable
Support
Column
GeneratorSlide7Slide8
θ
F
n
F
t
F
n
F
tSlide9
2 m
0.5 m
chain
wheel
shaft
shaft
blade
track
Slider
Aluminium plateSlide10
PredictionsSlide11
W
2R
Clockwise:
Θ
= 0.5
Clockwise:
Θ
= 0
F
n
F
t
M
y
x
R
q
DefinitionsSlide12
2D vortex model resultsSlide13Slide14Slide15
Power coefficient
Blade speed
o –
Moonraker
,
+ –
Darrieus
2D point vortex model using empirical blade dataSlide16Slide17
chain
Attachment link
Aluminium plate
Nylon pads
(rapid prototyped)
Aluminium plate
Screws
Blade
Wheel (bearing)
S/steel shaftSlide18
Blade
(carbon fibre)
chain
wheel
Attachment link
S/steel shaft
Nylon pads
(rapid prototyped)
Aluminium platesSlide19Slide20Slide21
VideoPII_001.wmvSlide22
Blade
(hollow carbon fibre shell)
Steel cantilever insert
Distributed load
Strain gauges at root
of cantilevered insert
blade
Tracks
Tracks
Distributed load
Strain gauges
Bending
member
Blade
(hollow carbon fibre shell)
Tracks
Tracks
Blade
Blade
(hollow carbon fibre shell)
Blade instrumentation conceptsSlide23
Distributed load
Strain gauges
Bending
member
Blade
(hollow carbon fibre shell)
Tracks
Tracks
Blade
Blade
(hollow carbon fibre shell)
Blade instrumentation concepts
How to record the signal from the strain gauge?Slide24
Carbon
fibre
blade
61 mm
Microlog main PCB
Microlog bluetooth transceiver
9 mm
Microlog
filter circuit (inside blade)
TerminalsSlide25
Polished
surfaces for
strain gauges
Holes for cables
Holes for dowel pins
18 mm
Junction board
Stainless steel rod
Dual strain gauge
Microlog main PCBSlide26
Nano batteries
Bending member
Microlog PCBs
Charging circuit
Filled with Silicone
Dowel pins
Epoxy escape holes
Filled with epoxy
Flush dowel pinsSlide27Slide28
QinetiQ Plc.,
Naval testing facilities, Haslar
, near Portsmouth, UKSlide29
CalibrationSlide30
Results: Fourier fitting (1/3)Slide31
Results: Fourier fittingSlide32
Results: Fourier fittingSlide33
W
2R
Clockwise:
Θ
= 0.5
Clockwise:
Θ
= 0
F
n
F
t
M
y
x
R
q
Recap: definitionsSlide34
Normal forceSlide35
Normal forceSlide36
Normal forceSlide37
Summary of results for force normal to blade’s motion,
F
nData here is for results with 3 bladesSlide38
Tangential force; 6 bladesSlide39
Tangential force; 6 bladesSlide40Slide41
x – experiment
o – vortex model (infinite blades)
– vortex model (finite blades)
for 6 blades
6 bladesSlide42
Tangential force; 3 bladesSlide43
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
ideal
practical
Cable-tie extended
3 bladesSlide44
3 bladesSlide45Slide46Slide47
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.Slide48
Thank you… and questions
www.londonmarinepower.co.uk
(from Kaz: www.londonmarinepower.co.uk.nyud.net )Slide49
Results: Fourier fitting