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AN ABSTRACT OF THE THESIS OF Kevin J. Drost for the degree of Honors Baccalaureate of Science in Mechanical
 

Summary:  AN ABSTRACT OF THE THESIS OF
Kevin J. Drost for the degree of Honors Baccalaureate of Science in Mechanical
Engineering presented May 21, 2010. Title: Direct Numerical Simulation of a Flat Wing
with a Movable Front Flap at High Angles of Attack and Low Reynolds Numbers.
Abstract approved:
__________________________________________________
Sourabh Apte
Low Reynolds number airfoils have become of interest recently for applications
on Micro-air Vehicles (MAVs). Airfoils at low Reynolds numbers and high angles of
attack are known to be unstable due to low lift to drag ratios. This study investigates the
effect of a movable leading edge flap on the lift to drag ratio of an airfoil for use on
MAVs. Direct numerical simulation (DNS) is used to fully resolve the flow around a thin
airfoil at high angles of attack. The airfoil is represented numerically using a fictitious
domain approach and assuming two-dimensional flow. The solver is validated using the
standard case of a cylinder in cross-flow. Preliminary experimental data for the lift of the
airfoil compares well with the numerical results for two angles of attack. Cases were run
at a Reynolds number of 14,700 and an angle of attack of 20 degrees to study the effect
of the front flap at a static angle and the effect of an oscillating front flap. Lowering the
front flap to an angle of 20 degrees increased the lift to drag ratio to 5.84 compared to
2.47 for the no flap case. Cases with a moving front flap were run at 1, 3, and 5 Hz. The

  

Source: Apte, Sourabh V. - School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University

 

Collections: Engineering