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Experimental Study of Aerodynamics Around Rotating Blades in a Lawnmower Deck

[+] Author Affiliations
P. A. Hagen, W. Chon, R. S. Amano

University of Wisconsin at Milwaukee, Milwaukee, WI

Paper No. FEDSM2002-31072, pp. 67-75; 9 pages
doi:10.1115/FEDSM2002-31072
From:
  • ASME 2002 Joint U.S.-European Fluids Engineering Division Conference
  • Volume 1: Fora, Parts A and B
  • Montreal, Quebec, Canada, July 14–18, 2002
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3615-0 | eISBN: 0-7918-3600-2
  • Copyright © 2002 by ASME

abstract

The objective of this study is to investigate the flow behavior within a triple-blade lawnmower deck by means of experimental techniques. The test section was constructed for velocity measurement with an open bottom and side-discharge. Velocity measurements were collected at several different tangential and axial sections inside the deck. The flow behaviors are observed using both a Laser Doppler Velocimetry (LDV) and a high-speed video camera capturing 2000 frames per second. Several different visualization techniques have been attempted: particle feeding, water vapor injection, tuft method, and others. To further enhance the experimental accuracy, fresh sod was fed into the system simulating normal cutting conditions. Along with the extensive velocity analysis, strain and static pressure were also examined at various surface locations along the blade using linear strain gages and a piezoresistive pressure transducer. It has been observed that the deck and blade configurations share equal significance in the resultant flow profiles.

Copyright © 2002 by ASME

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