Measurements of Small-Scale Propellers Operating in the Vortex Ring State
Shetty, Omkar R.
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https://hdl.handle.net/2142/18400
Description
Title
Measurements of Small-Scale Propellers Operating in the Vortex Ring State
Author(s)
Shetty, Omkar R.
Issue Date
2011-01-14T22:49:11Z
Director of Research (if dissertation) or Advisor (if thesis)
Selig, Michael S.
Department of Study
Aerospace Engineering
Discipline
Aerospace Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Date of Ingest
2011-01-14T22:49:11Z
Keyword(s)
vortex ring state (VRS)
propeller tests
Abstract
The behavior of small-scale propellers operating in vertical descent
and through the vortex ring state (VRS) was measured. In particular,
a total of 26 propellers with varying diameters (9 to 11 in) were
tested in the UIUC 2.8 x 4 ft wind tunnel at low Reynolds
numbers to measure the propeller thrust over a range of advance ratios
from -0.8 to 0. Also, time histories of the measured thrust for
different propellers were recorded to characterize the unsteady thrust
fluctuations for advance ratios through the vortex ring state. The
effects of propeller geometry, e.g. pitch and planform effects, on the
thrust characteristics of these propellers in the VRS are discussed. The motivation of this research is to understand better, the phenomenon of VRS observed in helicopter rotors in descent.
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