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Title:Measurements of Small-Scale Propellers Operating in the Vortex Ring State
Author(s):Shetty, Omkar R.
Advisor(s):Selig, Michael S.
Department / Program:Aerospace Engineering
Discipline:Aerospace Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(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.
Issue Date:2011-01-14
Rights Information:Copyright 2010 Omkar Ravindra Shetty
Date Available in IDEALS:2011-01-14
Date Deposited:December 2

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