Date of Award

12-1992

Document Type

Thesis

Degree Name

Master of Science

Department

Department of Aeronautics and Astronautics

First Advisor

Paul I. King, PhD

Abstract

The purpose of this thesis was to investigate experimentally the aerodynamic forces on two adjacent, independently rotating cylinders in a cross- flow. This investigation involved a force measurement setup which had the two cylinders mounted on a common support shaft, extending beyond the span of the wind tunnel test section, and supported by spoke rings with strain gages in the vertical and horizontal directions. This setup proved capable of measuring aerodynamic forces. The lift on the independently rotating cylinders was found to increase as one cylinder's angular speed increased while the other's remained constant, and decrease as the relative angular rate decreased. The drag coefficient was fairly constant over the range of velocity ratios tested, and minimal changes were noted with relative changes in angular speeds. Interactions between the two cylinders had the most effect on the lift and drag above 40% disparity in the angular rotation rates. The investigation also showed that for an offset angle of 30° on an approximately two-dimensional cylinder, the normal component of freestream velocity may be treated as the only significant contributor to the forces on the cylinder.

AFIT Designator

AFIT-GAE-ENY-92D-11

DTIC Accession Number

ADA258917

Comments

The author's Vita page is omitted.

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