Recent Studies

Here is a brief listing of papers and presentations made by the Wind Energy Group .

Refereed Journal Publications (select)

1. Swytink-Binnema, N.* and D.A. Johnson, (2015), "Digital tuft analysis of stall on operational wind turbines", Wind Energy, DOI: 10.1002/we.1860

2. Gharali, K.* and D.A. Johnson, (2014), "PIV-based load investigation in dynamic stall for different reduced frequencies", Exp. Fluids, 55, 1803, DOI: 10.1007/s00348-014-1803-8.

3. Swytink-Binnema, N.* and D.A. Johnson, (2014), "Novel Image Analysis Method for Blade Aerodynamic Performance on Operational Turbine", J. Physics Conf. Ser. 524(1):012016. DOI:10.1088/1742-6596/524/1/012016.

4. Abdelrahman, A.* and D.A. Johnson, (2014), "Experimental Testing of Axial Load Alleviation using Trailing Edge Flaps: Static Flap Angles Case", J. Physics Conf. Ser. 524(1):012059. DOI:10.1088/1742-6596/524/1/012059.

5. Gharali, K.* and D.A. Johnson (2014), "Effects of non-uniform incident velocity on a dynamic wind turbine airfoil", Wind Energy, DOI: 10.1002/we.1694.

6. Bale, A.* and D.A. Johnson, (2013), "The application of a MEMS microphone phased Array to Aeroacoustics of Small Wind Turbines", Wind Engineering, 37, 6, 637-658.

7. Gharali, K.* and D.A. Johnson (2013), "Dynamic stall simulation of a pitching airfoil under unsteady freestream velocity" Journal of Fluids and Structures DOI:10.1016/j.jfluidstructs.2013.05.005

8. Johnson, D.A., Abdelrahman, A.*, and D. Gertz* (2012), "Experimental indirect determination of wind turbine performance and Blade Element Theory parameters in controlled conditions", Wind Engineering, 36, 6, 717-738.

9. Gertz, D.*, Johnson, D.A. and Nigel Swytink-Binnema*, (2012), "An evaluation testbed for wind turbine blade tip designs - winglet results", Wind Engineering, 36, 4, 389-410.

10. Johnson, D.A. and B. Gaunt*, (2012), "Wind turbine performance in controlled conditions: experimental results", International Journal of Green Energy DOI:10.1080/15435075.2012.675799

11. Gharali, K.* and D.A. Johnson, (2012), "Numerical modeling of an S809 airfoil under dynamic stall, erosion and high reduced frequencies", Applied Energy, 93, 45-52. DOI:10.1016/j.apenergy.2011.04.037

12. Gertz, D.* and D. Johnson, (2011), "An evaluation testbed for wind turbine blade tip designs baseline case", Int. J. Energy Research, 35, 15, 1360-1370 DOI: 10.1002/er.1897

13. Orlando, S.*, Bale, A.*, and D. Johnson, (2011) "Experimental study of the effect of tower shadow on anemometer readings", J. Wind Engineering and Industrial Aerodynamics, 99, 1, 1-6.

14. Devaud, C.B., Weisinger, J.*, Johnson, D.A and E.J. Weckman, (2009) "Experimental and Numerical Characterization of the Flowfield in the Large-scale UW Live Fire Research Facility", International Journal for Num. Methods in Fluids, 60, 5, 539-564.

Refereed Book Chapters (select)

40. Gertz, D.*, Johnson, D.A. and N. Swytink-Binnema*, "Comparative Measurements of the Effect of a Winglet on a Wind Turbine", in Wind Energy-Impact of Turbulence, Hölling, Peinke, Ivanell, eds. Springer, 2014 ISBN 978-3-642-54696-9

41. Gharali, K.*, Johnson, D.A. and V. Lam*, "Unsteady Flow Investigation Around a Pitching Wind Turbine Blade Element", in Part III: Experiments, Wind Energy-Impact of Turbulence, Hölling, Peinke, Ivanell, eds. Springer, 2014 ISBN 978-3-642-54696-9

Fully Refereed Conference Proceedings (select)

42. Gharali, K.*, Tam, N.* and D.A. Johnson, "A PIV Load and Flow Study of a Serrated Dynamic Airfoil ", 17th Int. Symp. Appl Laser Tech Fluid Mechanics, July 7-10, 2014, Lisbon, Portugal, 10 pp.

44. Swytink-Binnema, N.* and D.A. Johnson, "Novel Image Analysis Method for Blade Aerodynamic Performance on an Operational Turbine", The Science of Making Torque from Wind, June 17-20, 2014, Copenhagen, DK, 10 pp.

45. Abdelrahman, A.* and D.A. Johnson, "Experimental Testing of Axial Load Alleviation using Trailing Edge Flaps: Static Flap Angles Case", The Science of Making Torque from Wind, June 17-20, 2014, Copenhagen, DK, 11 pp.

10. Gharali, K.*, Gu, M.* and D.A. Johnson, "Reduced frequency effects on dynamic stall phenomena", 10th Int. Symp. Particle Image Velocimetry, Delft, Netherlands July 1-3, 2013

11. Gu, M.* and D.A. Johnson, "Coherent structures in flow around a pitch-oscillating square cylinder", 10th Int. Symp. Particle Image Velocimetry, Delft, Netherlands July 1-3, 2013

12. Gharali, K.*, Gu, M.* and D.A. Johnson, "A PIV Study of a Low Reynolds Number Pitch Oscillating SD7037 Airfoil in Dynamic Stall with CFD comparison", 16th Int. Symp. Appl Laser Tech Fluid Mechanics, July 9-12, 2012, Lisbon, Portugal 10 pp.

13. Gertz, D.*, Johnson, D.A. and Nigel Swytink-Binnema*, "Experimental Evaluation of a Wind Turbine Blade Winglet", EUROMECH Colloquium 528, Oldenburg, Germany, February 22-24, 2012 to be published in the Springer Proceedings Series

14. Gharali, K.*, Lam, V.* and D.A. Johnson, "Unsteady Flow Investigation around a Pitching Wind Turbine Blade Element", EUROMECH Colloquium 528, Oldenburg, Germany, February 22-24, 2012 to be published in the Springer Proceedings Series

15. Gertz, D.* and D.A. Johnson, "An Evaluation Testbed For Alternative Wind Turbine Blade Tip Designs", International Green Energy Conference IGEC V, Waterloo, Canada, June 1-3, 2010

16. Bale, A.*, Orlando, S.* and D.A. Johnson, "Design and Preliminary Testing of a MEMS Microphone Phased Array for Aeroacoustic Testing of a Small-Scale Wind Turbine Airfoil", International Green Energy Conference IGEC V, Waterloo, Canada, June 1-3, 2010

17. Lam, V.* and D.A. Johnson,? "Wind resource assessment and loss factors for small wind turbines", International Green Energy Conference IGEC V, Waterloo, Canada, June 1-3, 2010

18. Gharali, K.* and D.A. Johnson,? "Numerical Modeling Of Pitch Oscillating S809 Airfoil Dynamic Stall In 2D With Application To A Horizontal Axis Wind Turbine", International Green Energy Conference IGEC V, Waterloo, Canada, June 1-3, 2010

19. Orlando, S.*, Bale, A.* and D.A. Johnson, "Design And Preliminary Testing Of A MEMS Microphone Phased Array", Proceedings of Berlin Beamforming Conference BeBeC, Berlin, Germany, February 24-25, 2010

20. Gharali, K.* and D.A. Johnson, "Pressure and Acceleration Determination Methods Using the PIV Velocity Data Set", ASME Fluids Engineering Division, Jacksonville, FL, August 10-14, 2008, 657-664, FEDSM2008-55157

21. McWilliam, M.* and D.A. Johnson, "Development of a Wind Tunnel Test Apparatus for Horizontal Axis Wind Turbine Rotor Testing", ASME 2nd International Conference on Energy Sustainability, Jacksonville, FL, August 10-14, 2008, 679-687, ES2008-54194

22. Johnson, D.A., "Renewables-based Micro Grid Development for Remote Communities", 14th Technology Summit: Clean Technologies, Hotel The Grand, Delhi, India, Dec. 4-6, 2008, Sponsor Cdn. Dept. Foreign Affairs (Invited)

23. Gaunt, B.* and D.A. Johnson, "The Effect of Wind Turbine Airfoil Pitching on Stall", ASME 2nd International Conference on Energy Sustainability,

Jacksonville, FL USA, August 10-14, 2008, ES2008-54231

24. Parker, P. and D.A. Johnson, "Renewable Energy in Remote Communities: First Nations and a wind-based strategy", 2008 Canadian Association of Geographers Annual Meeting, University Laval, Quebec, Canada May 20-24, 2008

    Conferences (accepted based on abstract)

25. Tam, N.*, D. Johnson, C. Knischewsky*, and N. Swytink-Binnema*, "Implementing a data acquisition system on a 30kW wind turbine", 1000 Island Energy Research Forum, TIERF, June 13-15, 2013, Queens University, Kingston, Canada

26. Abdelrahman, A.*, and D. Johnson, "Experimental indirect determination of wind turbine performance and Blade Element Theory parameters in controlled conditions", 1000 Island Energy Research Forum, TIERF, June 13-15, 2013, Queens University, Canada

27. Gu, M., N. Swytink-Binnema, and D. Johnson, "Blade Element Momentum Modeling in Support of Experimental Measurements on a 30kW Wind Turbine", 1000 Island Energy Research Forum, TIERF, June 13-15, 2013, Queens University, Kingston, Canada

28. Swytink-Binnema, N.* and D. Johnson, "Passive Pitch Control on a 30 kW Wind Turbine", 1000 Island Energy Research Forum, TIERF, June 13-15, 2013, Queens University, Kingston, Canada

29. Johnson, D.A., "Controlled Wind Facility for Turbine Evaluation", Invited Talk, Advanced Energy Conference 2013, New York, NY, US Apr. 30-May 1, 2013.

30. Abdelrahman, A., Swytink-Binnema, N.* and D. A. Johnson, "Ongoing experimental study of nacelle velocity measurements", NSERC WESNet Ann. Meeting, Toronto, Canada, 17 Oct. 2012

31. Swytink-Binnema, N.* and D. Johnson, "Oil Flow Visualization on Blade Tips", CanWEA 28th Ann Conf. Toronto, Canada, Oct 14-17, 2012. 1st prize WESNet paper competition.

32. Abdelrahman, A.* and D. Johnson, "Experimental measurement of wind turbine performance through Blade Element Theory", CanWEA 28th Ann Conf. Toronto, Canada, Oct 14-17, 2012.

33. Gharali, K.*, Gu, M. and D. Johnson, "Experimental and Numerical Study of a Pitch Oscillating Airfoil", CanWEA 28th Ann Conf. Toronto, Canada, Oct 14-17, 2012

34. Bale, A.* and D. Johnson, "The Application of MEMS Microphone Arrays to Aeroacoustic Measurements", (Invited), CanWEA 27th Ann Conf. Vancouver, Canada, Oct 3-6, 2011

35. Swytink-Binnema, N.* and D. A. Johnson, "Wind tunnel testing of nacelle/rotor arrangement", NSERC WESNet Annual Meeting, Vancouver, Canada, Oct. 6, 2011

36. Gharali, K.* and D. Johnson, "Unsteady Flow Investigation Around a Pitching Wind Turbine Blade",CanWEA 27th Ann Conf., Vancouver, Canada, Oct 3-6, 2011

37. Gertz, D.P.* and D. A. Johnson, "The Design, Fabrication, and Testing of a Wind Turbine Blade with Interchangeable Tips", Proceedings of CSME FORUM 2010, Victoria, Canada, June 7-9, 2010

38. Gertz, D.* and D. Johnson, "Experimental prediction of wind turbine performance through velocity measurements", 22nd Canadian Congress of Applied Mechanics", Halifax, Canada, May 31-June 4th, 2009

39. Gaunt, B.* and D.A. Johnson, "Wind Turbine Performance: Power Production and Flow Visualization Experiments in a Controlled Environment", Canadian Wind Energy Association (CanWEA) 25th Annual Conference, Toronto, Canada, Sept. 20-23, 2009

40. Orlando, S.*, Bale, A.*, Gertz, D.* and D.A. Johnson, "Effect of Tower Shadow on Anemometer Readings", Canadian Wind Energy Association (CanWEA) 25th Annual Conference, Toronto, Canada, Sept. 20-23, 2009

41. McWilliam, M.*, Johnson, D.A., Gharali, K.*, McPhee*, A., Gaunt, B.*, Skensved, E.*, Orlando, S.*, Bale, A.*, Gertz, D.* and V. Lam*, "Wind Energy Research", Canadian Wind Energy Association (CanWEA) 24th Ann Conf, Vancouver, Canada, Oct. 19- 22, 2008

42. Gertz, D.* and D. Johnson, "Wind Tunnel Testing of a Wind Turbine Blade with Interchangeable Tips", 1000 Island Energy Research Forum, TIERF, Alexandria Bay, NY, Nov. 12-14, 2010

43. Lam, V.* and D. Johnson, "Method of analysing the long-term turbulence level from meteorological data", 1000 Island Energy Research Forum, TIERF, Alexandria Bay, NY, Nov 12-14, 2010

44. Gharali, K.* and D. Johnson, "Unsteady modeling of dynamic stall phenomena with application to a Horizontal Axis Wind Turbine", CanWEA 26th Ann Conf., Montreal, Canada, Nov. 1-3, 2010

45. Gertz, D.* and D. Johnson, "Analysis of Wind Turbine Blade Tips", Canadian Wind Energy Association (CanWEA) 26th Ann Conf., Montreal, Canada, Nov. 1-3, 2010

46. Bale, A.* and D. Johnson, "Locating Noise Sources With A Microphone Array", Canadian Wind Energy Association (CanWEA) 26th Ann Conf., Montreal, Canada, Nov. 1-3, 2010

47. Lam, V.* and D. Johnson, "Turbulence levels determined from meteorological data", Canadian Wind Energy Association (CanWEA) 26th Ann Conf., Montreal, Canada, Nov. 1-3, 2010

48. Gertz, D.* and D.A. Johnson, (2010), "The Design, Fabrication, and Testing of a Wind Turbine Blade with Interchangeable Tips", CSME Forum, Victoria, Canada, June 7 9, 2010

49. Gaunt, B.*, Gertz, D.*, Orlando, S.* and D. A. Johnson, "Wind tunnel testing of nacelle/rotor arrangement of a Full Scale Wind Turbine", WESNet Workshop at ETS, Montreal, Canada, May 27, 2010

50. Gaunt, B.* and D.A. Johnson, "Wind Turbine Performance: Power Production and Flow Visualization Experiments in a Controlled Environment", Canadian Wind Energy Association (CanWEA) 25th Annual Conference, Toronto, Canada, Sept. 20-23, 2009

51. Orlando, S.*, Bale, A.*, Gertz, D.* and D.A. Johnson, "Effect of Tower Shadow on Anemometer Readings", Canadian Wind Energy Association (CanWEA) 25th Annual Conference, Toronto, Canada, September 20-23, 2009

52. Johnson, D.A., "Wind-Diesel-Storage Project at Kasabonika Lake First Nation", (invited) 2009 Wind-Diesel Workshop, Ottawa, Canada, June 1-2, 2009

53. Gaunt, B.* and D.A. Johnson "Investigating Airflow over an Oscillating Wind Turbine Airfoil In the Stalled Region", Can. Wind Energy Conf., Quebec, Canada Sept 30-Oct 3, 2007

54. McWilliam, M.* and D.A. Johnson "Research in Dynamic Stall", Canadian Wind Energy Association Conference, Quebec, Canada, Sept. 30 - Oct. 3, 2007

55. Johnson, D.A., "Aerodynamic Measurements on Wind Turbines", 19th annual Canadian Power Conference - Association of Power Producers of Ontario (APPrO), Toronto, Canada, Nov. 13-14, 2007

56. McWilliam, M.* and D.A. Johnson, "CFD Study in the Applicability of Wind Tunnel Testing for Wind Turbines", CANCAM, Toronto, Canada, June 3-7, 2007

57. McWilliam, M.* and D.A. Johnson, "Wind Turbine Aerodynamic Research", Canadian Wind Energy Association Conference, Winnipeg, Canada, Oct. 22-25, 2006

58. McWilliam, M.* and D.A. Johnson, "Effect of Blade Geometry Distribution on Overall Wind Turbine Performance in Varying Environments" CSME FORUM 2006, Kananaskis, Canada May 21-24, 2006 * Best Paper Competition 3rd place

59. McWilliam, M.* and D.A. Johnson,"Velocity Measurement Of Savonius Wind Turbines" IGEC-2 2nd International Green Energy Conf., Oshawa, Canada June 25-29, 2006 10pp

60. McWilliam, M.* and D.A. Johnson, "Wind Turbine Aerodynamic Research" 2006 CanWEA Annual Conference, Winnipeg, Canada, October 22-27, 2006

    Submitted to Conferences (accepted based on abstract)

61. Johnson, D., Knischewsky, C., Swytink-Binnema, N., and Tam, N., "Performance Monitoring System including blade aerodynamics of a Passively-Controlled Wind Turbine", CanWEA 29th Ann Conf. Toronto, Canada Oct 7-10, 2013.?

62. Swytink-Binnema, N. and D. Johnson, "The Pitching Mechanism on a 30 kW Wind Turbine", CanWEA 29th Ann Conf. Toronto, Canada Oct 7-10, 2013.

63. Tam, N. and D. Johnson, "Implementation of a Wireless Data Acquisition System on a Wind Turbine", CanWEA 29th Ann Conf. Toronto, Canada Oct 7-10, 2013.