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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

 ?Slide2
Slide3

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 EngineeringSlide4
Slide5
Slide6

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

GeneratorSlide7
Slide8

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 resultsSlide13
Slide14
Slide15

Power coefficient

Blade speed

o –

Moonraker

,

+ –

Darrieus

2D point vortex model using empirical blade dataSlide16
Slide17

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 platesSlide19
Slide20
Slide21

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 pinsSlide27
Slide28

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 bladesSlide40
Slide41

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 bladesSlide45
Slide46
Slide47

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

By: jane-oiler
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Type: Public

Hydrodynamics of tidal stream energy - Description


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 Download Presentation

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