03.2 - Experimental Aerodynamics
EFFECT OF MOLTING ON THE AERODYNAMIC CHARACTERISTICS OF BLACK-TAILED GULLS
Y. Tanhashi¹, F. Sakai¹, S. Nishizuka¹, T. Ikeda¹, N. Kishimoto, Kwansei Gakuin University, Japan; M. Tamayama, Japan Aerospace Exploration Agency, Japan; Y. Iwami², N. Tomita²; ¹Chubu University, Japan ;²Yamashina Institute for Ornithology, Japan
Birds undergo a process called 'molting,' where feathers are replaced in a specific sequence after the breeding season. During this period, birds fly with partially missing wing surfaces. To clarify the aerodynamic impact of these wing defects, this study conducted wind tunnel tests using 3D-printed models and numerical analysis based on 3D CAD data. The results indicated that while lift and drag coefficients showed no significant differences, the rolling moment coefficient exhibited distinct changes when a defect existed on only one wing. This paper focuses on the influence of partial wing defects on the rolling moment through both experimental and numerical approaches.