1 / 10

Effect of a Swing Rudder on The Yaw Alignment of Small Wind Turbines

Effect of a Swing Rudder on The Yaw Alignment of Small Wind Turbines. The University of Tokyo Mitsumasa Iino The University of Tokyo Makoto Iida. Effect of wind direction change on small wind turbines. Yaw error Load imbalance on rotor plane Reduction of Power Yaw rate Gyro moment.

rafe
Download Presentation

Effect of a Swing Rudder on The Yaw Alignment of Small Wind Turbines

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Effect of a Swing Rudder on The Yaw Alignment of Small Wind Turbines TheUniversity of Tokyo Mitsumasa Iino The University of Tokyo Makoto Iida

  2. Effect of wind direction change on small wind turbines • Yaw error • Load imbalance on rotor plane • Reductionof Power • Yaw rate • Gyro moment Yawed flow affects power and structural performance • Yaw control of horizontal axis SWT • Aerodynamic force on rotor and rudder(upwind) • Aerodynamic force on rotor(downwind) • Active yaw

  3. Rudders of small wind turbines • Design parameters • Tail fin area • Boom length • Number of fin • Position of tail fin (higher than nacelle etc.) Many parameters Optimum design has not yet achieved

  4. Purpose and method • Establish theoretical design and evaluation method of small wind turbines with a swing rudder • Method • Aeroelastic simulation code NRELFAST • Blade element and momentum theory • Multibody dynamics • Compare Swing rudder and Fixed rudder • Model target • Zephyr AirDolphin • Rated power 1.1kW • Diameter 1.8m • Cut in wind speed 2.5m/s

  5. WindCondition • Single direction change • Parameters • : amount of wind direction change[deg] • Time of wind direction change[s] • : Constant wind speed[m/s • Definition of Wind direction change Direction Time Single direction change, various parameters

  6. Yaw error time series Swing rudder Tmax=1 Fixed rudder Tmax=1 Swing rudder Tmax=2 Fixed rudder Tmax=2 Direction Swing rudder Tmax=1 Fixed rudder Tmax=1 Swing rudder Tmax=2 Fixed rudder Tmax=2 Time • Yaw error decreases with swing rudder at T=1,2 s • Allover yaw error decreases as Tmax increases Swing rudder Tmax=6 Fixed rudder Tmax=6 Swing rudder Tmax=10 Fixed rudder Tmax=10

  7. Yaw errorreduction • Tmax = 1 or 2 s Maximum yaw error reduced by swing rudder • Tmax > 2 s Maximum yaw error increased by swing rudder Direction Time

  8. Wind direction Motionof rudder Yaw Error 1.Maximum yaw error reduced by Swing rudder 2.Maximum yaw error increased by Swing rudder Rudder error • Case1U=4m/s Tmax=1 θmax=60° the absolute value of rudder error is larger than yaw error at yaw error peak • Case2U=4m/s Tmax=10 θmax=60° the absolute value of rudder error is smaller than yaw error at yaw error peak Direction Time Definition of Rudder, Yaw error

  9. Yaw rate and blade root loadreduction • Yaw rate is reduced up to about 8% • Blade root bending moment reduced up to 6% Direction Time

  10. Summary and Conclusion • Summary • Modeling small wind turbine with a swing rudder • Comparison between swing and fixed rudder • Conclusion • Yaw error reduction • direction change is happen in 1 or 2 sec • Possibility to increase yaw error by swing rudder • Yaw rate and blade root load reduced by the swing rudder • Rudder significantly influences the design • Load estimation of IEC61400-2 Ed.2 Aeroelastic modeling

More Related