“e-ro.dynamic” transferring knowledge from aerospace to ... · * field test at nordex n60...

© SPITZNER ENGINEERS GmbH ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT.

SE_presentation_normal.pptx Rev. 19.05.2014

“e-ro.dynamic”

Transferring knowledge from

aerospace to wind energy

Presentation at

CFK-Valley Stade Convention 2014

Fabian-Timmo Seebo

24.06.2014

© SPITZNER ENGINEERS GmbH

ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT.

Motivation

How to increase the energy output of

operating wind turbines…?

…by transferring known aircraft

technologies!

24 June 2014 2

Chevron

nozzles

Vertical tail plane:

boundary layer control

laminar wing

winglet



Topic: Aerodynamic optimization of operating wind turbine rotor

blades (AOR)

Platform: Supported by federal ministry of

economics and technology

Duration: October 2010 – October 2012

Collaboration:

Product Development Scientific Research Manufacturing

EEHH Cluster “German Renewables Award 2013”

Category: Project of the Year

Research project

24 June 2014 3



Basic Idea

Increase of rotor blade efficiency as a retrofit solution.

24 June 2014 4

„Old design“ rotor blade Aerodynamically improved rotor blade

=efficient Rotor blade

Product: e-ro.dynamic®



Rotor Blade Modifications

24 June 2014 5

Boundary

layer fence

Winglet

New airfoil for blade root

Boundary layer

Control

Zig-zag shaped

trailing edge



Passive boundary layer control system

• Air on the rotor blade surface at the root is sucked in

• The suction is induced through pressure differences due to the

rotation of the blade

• The sucked air is transported through the blade

• In the end, the air is blown out at the trailing edge of the tip’s airfoil

24 June 2014 6

Flow

outlet

Flow

inlet Air is transported

from root to tip



Field testing N60 1.3MW

24 June 2014 7




Power Curve Analysis

24 June 2014 8

* Field Test at Nordex N60 1.3MW. Measured power curve in

conformity with IEC61400-12-1, normalized power curve

(1.225 kg/m³), Data period May 2012 – March 2014, wind

speed measured with nacelle anemometer

Measured power curve*, N60

Po

wer

gain

, %

Ele

ctr

ical p

ow

er,

kW

Wind speed hub height, m/s

Power gain orig e-ro.dynamic

+ 15,7% power gain

Method validated with

neighbouring wind turbines

05/2011 – 04/2012 WEC3 WEC4 WEC5

06/2012 – 03/2014 WEC3 WEC4

e-ro.dynamic® WEC5

Average power increase - 0,1 % + 15,7 % - 0,3 %

optimized




Energy Production Assessment

Increase in Annual Energy Production (AEP) at test wind farm estimated

• Measured annual average wind speed at test wind farm

is 5,9 m/s

• N60 AEP before modification: 2.034.000 kWh per year

• N60 AEP with e-ro.dynamic®: 2.336.000 kWh per year

AEP gain study for different wind sites

24 June 2014 9

Prediction of annual energy production (AEP) based

on measured power curves. Rayleigh wind

distribution, assumed technical availability 100%,

power curve normalized with sea level 1,225 kg/m³,

Wind speed measured with nacelle anemometer Annual average wind speed (m/s)

AE

P i

ncre

as

e (

%)

Estimated energy gain per year, Rayleigh distribution, 100% availability

+ 302.000 kWh (+ 14,8 %)

energy increase per year

at tested wind farm




Acoustics

Analysis in conformity with IEC 61400-11

24 June 2014 10

Power curve

WEC4 original

WEC4 e-ro

Hub height wind speed (m/s)

So

un

d p

ow

er

leve

l (d

B)

WEC4 original

WEC4 e-ro.dynamic

Power curve

original

e-ro.dynamic

Ele

ctr

ical p

ow

er

(kW

)

No increase of sound power level



Certification

Design Requirements according to IEC 61400-1

proved

Primary structure of rotor blade is not affected

Only minor changes of wind turbine rotor blades

Easy application and local authorities approval

according to §15 BImSchG

Passive system, no additional components

needed, no change of turbine control system

24 June 2014 11

„The assumptions for

designing the rotorblades,

which have been made,

are plausible and the

calculations are

comprehensible. There is

no danger of stabillity

expected. “

Certified by DEWI-OCC



Summary & Outlook

• Aircraft technologies successful transferred to wind turbines

Prototype shows high energy production benefits

No increase of sound pressure level

Loads and fatigue damage do not exceed maximum limits

Modification certified by authorities

• First wind farms are equipped with e-ro.dynamic

Power curve analysis of more modified N60 turbines

to verify prototype results

• Blade design for pitch regulated wind turbines

Field testing pitch turbine

24 June 2014 12

e-ro.dynamic Aerodynamically

Optimized

Rotorblades

SPITZNER ENGINEERS GmbH

Hein-Saß-Stieg 9, 21129 Hamburg

Telefon: +49 (0) 40 3708 6262

E-Mail: [email protected]

www.spitzner-engineers.de

Thank you for your attention!

“e-ro.dynamic” transferring knowledge from aerospace to ... · * field test at nordex n60...

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