ROTORCRAFT AERODYNAMICS GROUP
AHS FORUM, MONTREAL, 2002:
Prof. Leishman with some former students at the Forum.
From left to right, Dr. Ashish Bagai, Dr. Leishman, Dr. Preston Martin,
Dr. Mahendra Bhagwat |
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WHO WE ARE:
A group of faculty and graduate students
specializing in education and research into
rotorcraft aerodynamics. |
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CURRENT PERSONNEL:
- Professor J. Gordon Leishman
- Professor Alfred Gessow (Emeritus, Deceased)
- Manikandan Ramasamy (Graduate Research Assistant)
- Shreyas Anathan (Graduate Research Assistant)
- Dongwook Lee (Graduate Research Assistant)
- Jacob Park (Part-time graduate student)
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PREVIOUS RESEARCH PERSONNEL: |
- Dr. Naipei Bi
- Dr. Ashish Bagai
- Joe Tyler
- Ali Zandieh
- Alan Coyne
- Erwin Moedersheim
- Steve Teager
- Matt Franke
- Dr. Mahendra Bhagwat
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- Dr. Gilbert Crouse
- Terrance Ghee
- Dr. Berend van der Wall
- Andrew Baker
- Nagarajan Hariharan
- Maj. Keith Robinson
- Mark Daghir
- Markus Krekel
- Dr. Preston Martin
- Greg Pugliese
- Daniel Griffiths
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TEXTBOOK:
Principles of Helicopter Aerodynamics
by
J. Gordon Leishman, University of Maryland.
Published by Cambridge University Press.
HISTORY OF ROTORCRAFT:
The ideas of vertical flight can be traced back to early Chinese tops, a toy first used about 400 BC. Amongst his many elaborate drawings, the Renaissance visionary Leonardo da Vinci shows what is a basic human-carrying helicopterlike machine. His sketch of the "aerial-screw" or "air gyroscope" device is dated to 1483 but it was first published nearly three centuries later. Da Vinci clearly did not build his machine, except perhaps for some small models, but his idea was clearly far ahead of its time.
Read more....
COURSES THAT WE TEACH:
RESEARCH PROJECTS:
RECENT TECHNICAL PUBLICATIONS:
Published at the European Rotorcraft Forum, Bristol, England, Sept. 2002.
"Blade Twist Effects on Rotor Behavior in the Vortex Ring State" by R. Brown, J. G. Leishman, F. J. Perry & S. J. Newman. Click here to download a pdf version of this paper.
Published at the AHS International 58th Annual Forum, Montreal Canada, June 2002.
- "Free-Vortex Wake Predictions of the Vortex Ring State for Single-Rotor and Multi-Rotor Configurations" by J. Gordon Leishman, Mahendra J. Bhagwat and Shreyas Ananthan. Click here to download a pdf version of this paper.
- "Generalized Viscous Vortex Model for Application to Free-Vortex Wake and Aeroacoustic Calculations" by Mahendra J. Bhagwat and J. Gordon Leishman. Click here to download a pdf version of this paper.
- "A Study of Dual-Rotor Interference and Ground Effect Using a Free-Vortex Wake Model" by Daniel A. Griffiths and J. Gordon Leishman. Click here to download a pdf version of this paper.
- "The Role of Filament Stretching in the Free-Vortex Modeling of Rotor Wakes" by Shreyas Ananthan, J. Gordon Leishman and Manikandan Ramasamy. Click here to download a pdf version of this paper.
- "Trailing Vortex Measurements in the Wake of a Hovering Rotor With Various Tip Shapes" by Preston Martin and J. Gordon Leishman. Click here to download a pdf version of this paper.
Published at the AHS International Aerodynamics Meeting, San Francisco, CA, Jan. 2002.
- Leishman, J. G., Bhagwat, M. J. and Ananthan, S., "The Vortex Ring State As a Spatially and Temporally Developing Wake Instability." (Click here to download a pdf version of this paper - file size 7MB - please be patient !).
Presented at the 21st ASME Wind Energy Symposium and the 40th AIAA Aerospace Sciences Meeting, Reno, NV, Jan. 14--17, 2002.
- Leishman, J. G., "Challenges In Understanding the Unsteady Aerodynamics of Wind Turbines." (Click here to download a pdf version of this paper ).
Published at the AIAA Applied Aerodynamics Meeting, Reno, NV, July 1999:
- Martin, P. B., Pugliese, G. and Leishman, J. G., "Visualization of a Helicopter Rotor Wake in Hover." (Click here to download a pdf version of this paper - file size 17.7MB - please be patient - lots of flow field images).
Published at the 38th AIAA Aerospace Sciences Meeting, Reno, NV, January 2000:
- Martin, P. B., Pugliese, G. and Leishman, J. G., "Laser Doppler Velocimetery Uncertainty Analysis for Rotor Tip Vortex Measurements." (Click here to download a pdf version of this paper - file size 1.1MB).
Published at the 56th Annual Forum of the American Helicopter Society, Virginia Beach, VA, May 2000:
- Bhagwat, M. and Leishman, J. G., "On the Aerodynamic Stability of Helicopter Rotor Wakes." (Click on the image below to download a pdf version of this paper - file size 400KB).
- Martin, P., Leishman, J. G., Pugliese, G. and Anderson, S. "Stereoscopic PIV Measurements in the Wake of a Hovering Rotor." (Click on the image below to download a pdf version of this paper - file size 7.5MB ).
- Bhagwat, M. and Leishman, J. G. "Time-Accurate Free-Vortex Wake Model for Dynamic Rotor Response." (Click on the image below to download a pdf version of this paper - file size 0.8MB ).
- Bhagwat, M. and Leishman, J. G. "Transient Rotor Inflow Using a Time-Accurate Free-Vortex Wake Model " (Click on the image below to download a pdf version of this paper - file size 0.8MB ).
- More than 100 other technical publications have been produced by the Rotorcraft Aerodynamics Group since 1988. Click here for a list of recent publications.
OTHER GROUPS IN THE ROTORCRAFT PROGRAM:
EXAMPLES OF OUR WORK:
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Animation of the computed inflow over the
rotor disk in low speed forward flight at an
advance ratio of 0.1. Results were computed
using the Maryland Free Wake (MFW). |
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Click here to send us e-mail or to find out about
opportunities for graduate research leading
to an MS or PhD degree.
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This page originally designed by Erwin Moedersheim. Last updated by J.G. Leishman and G. Pugliese on 8/25/00.
