Date of Award
Master of Science in Engineering
Mechanical and Aerospace Engineering
Mechanical and Aeronautical Engineering
Dr. Daniel J. Dorney
Dr. Parviz Merati
Dr. Iskender Sahin
Masters Thesis-Open Access
The wings on aircraft can experience unsteady loads due to atmospheric disturbances; e.g., wind, the wakes of other aircraft, structural vibrations, or some combination of these sources. In some cases flow unsteadiness can be beneficial by augmenting the lift and reducing the drag; under different circumstances temporal variations in the flow can induce stall or cause structural failure.
In this study, the response of isolated (and tandem) NACA 0012 airfoil(s) to time-periodic unsteadiness have been investigated. The sources of unsteadiness include a time-varying free stream flow angle, a time varying free stream velocity magnitude, and an oscillating airfoil.
The predicted results indicate that the three types of unsteadiness investigated can generate additional airfoil lift and produce thrust (instead of drag) during a significant portion of an unsteady oscillation cycle.
Nakajima, "Study of Periodic Gust Loads on Airfoils" (1996). Master's Theses. 4899.