Title page for ETD etd-11152013-040410


Type of Document Master's Thesis
Author Al-Maaitah, Ayman Adnan
URN etd-11152013-040410
Title Effect of roughness element on the stability of boundary layers
Degree Master of Science
Department Engineering Science and Mechanics
Advisory Committee
Advisor Name Title
Ali H. Nayfeh Committee Chair
Saad A. Ragab Committee Co-Chair
Dean A. Mook Committee Member
Keywords
  • Aerofoils
Date of Defense 1986-11-05
Availability restricted
Abstract
The instability of flows around hump and dip imperfect1ons is invest1gated. The mean flow is calculated using interacting boundary

layers, thereby accounting for viscous/inviscid 1nteraction and separation bubbles. Then, the two-dimensional linear instability of this flow is analyzed, and the amplification factors are computed. Results are obtained for several height/width ratios and locations. The

theoretical results have been used to correlate the experimental results of Greening and Walker. The observed transition locations are found to

correspond to amplificat1on factors varying between 7.4 and 10, consistent with previous results for flat plates. The method accounts for Tol1mien—Schlichting waves, the shear layer instability, and their

interaction. Separation is found to increase significantly the amplification factor.

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