IJLTEMAS International Journal of Latest Technology in Engineering, Management & Applied Science (IJLTEMAS) IJLTEMAS 2278-2540 IJLTEMAS 308 10.51583/IJLTEMAS.2026.150800114 Harvesting Bio-Inspired Hybrid Dragonfly–Owl Wind Turbine Blade for Enhanced Energy Harvesting under Low Wind Speed Conditions S.Kumarappa S.Kumarappa Department of Mechanical Engineering, Bapuji Institute of Engineering & Technology, Davanagere, Karnataka, India India 15 8 1578 1594 10 09 2026 15 09 2026 19 09 2026 Bio-inspired Wind Turbine; Hybrid Biomimetic Blade; Dragonfly–Owl Inspired Design; Low Wind Speed; Wind Energy Harvesting. Abstract

Efficient utilization of low-speed wind resources remains a significant challenge for small- and medium-scale wind turbines because of low starting torque, premature flow separation, and aerodynamic losses. This study presents the design and aerodynamic evaluation of a bio-inspired dragonfly–owl wind turbine blade developed to improve energy extraction under low wind speed conditions. The blade combines dragonfly-inspired corrugated surface geometry with owl-inspired leading-edge serrations and trailing-edge fringes, integrating complementary passive flow-control mechanisms within a single blade configuration. A three-dimensional blade model was developed using computer-aided design (CAD) software and investigated using computational fluid dynamics (CFD) under steady-state operating conditions representative of low-speed wind environments. The aerodynamic characteristics of the hybrid blade were compared with those of a conventional blade based on velocity distribution, pressure contours, turbulence intensity, lift coefficient, drag coefficient, lift-to-drag ratio, and power coefficient. The numerical analysis indicated improved airflow attachment and modified vortex development over the biomimetic blade surface, together with improved pressure distribution and reduced wake disturbances. The combined corrugation and serration features enhanced the aerodynamic behavior of the blade by promoting more stable flow structures and delaying flow separation. These effects contributed to improved lift generation and aerodynamic efficiency, thereby indicating enhanced starting and low-speed operating characteristics compared with the conventional configuration. The owl-inspired serrated leading edge also demonstrated potential for mitigating unsteady wake structures and aerodynamic noise. The results indicate that combining dragonfly and owl morphological characteristics can provide an effective flow-control strategy for low-speed wind energy applications. The biomimetic blade offers a promising approach for developing compact, efficient, and environmentally compatible wind turbines for distributed renewable energy generation.

 References Ahmed, M. Rehan, and M. Alshammari, “Comparative analysis among different performance improvement techniques for wind turbines in terms of energy and economy for small, medium, and large-scale applications,” International Journal of Energy Research, 2025. J. D. Anderson, Fundamentals of Aerodynamics, 7th ed. New York, NY, USA: McGraw-Hill, 2023. T. Burton, N. Jenkins, D. Sharpe, and E. Bossanyi, Wind Energy Handbook, 3rd ed. Chichester, U.K.: Wiley, 2021. Carré, P. Gasnier, E. Roux, and L. Tabourot, “Extending the operating limits and performances of centimetre-scale wind turbines through biomimicry,” Applied Energy, vol. 326, Art. no. 119996, 2022. Y. A. Çengel and J. M. Cimbala, Fluid Mechanics: Fundamentals and Applications, 5th ed. New York, NY, USA: McGraw-Hill, 2022. M. Drela, Flight Vehicle Aerodynamics. Cambridge, MA, USA: MIT Press, 2014. Graham, “The silent flight of owls,” Journal of Experimental Biology, vol. 193, pp. 181–202, 1994. M. O. L. Hansen, Aerodynamics of Wind Turbines, 4th ed. London, U.K.: Routledge, 2023. Hansen and L. Butterfield, “Aerodynamics of horizontal-axis wind turbines,” Annual Review of Fluid Mechanics, vol. 25, pp. 115–149, 1993. International Energy Agency (IEA), Renewables 2024: Analysis and Forecast to 2030. Paris, France: IEA, 2024. Y. Ito, K. Imamura, and H. Azuma, “Aerodynamic influence of leading-edge serrations inspired by owl wings at low Reynolds numbers,” Bioinspiration & Biomimetics, 2019. Khedr and F. Castellani, “Dragonfly-inspired blades for high aerodynamic performance small horizontal axis wind turbine,” Journal of Physics: Conference Series, vol. 2767, 2024. Khedr and F. Castellani, “Dragonfly-inspired aerodynamics in horizontal axis wind turbines: Insights into fore-blade and hind-blade interaction through experimental and CFD studies,” Wind Energy, 2025. F. R. Menter, “Two-equation eddy-viscosity turbulence models for engineering applications,” AIAA Journal, vol. 32, no. 8, pp. 1598–1605, 1994. P. Panorel and J. C. Maglasang, “Experimental and computational investigation of corrugated dragonfly airfoil performance in small wind turbine applications,” Asia-Pacific Journal of Science, Mathematics and Engineering, vol. 4, no. 2, pp. 4–8, 2018. [P. Panorel and J. Maglasang, “Bio-mimicry in the aerodynamics of small horizontal axis wind turbines,” Energy Reports, 2025. S. Pope, Turbulent Flows. Cambridge, U.K.: Cambridge University Press, 2000. P. Prathik, S. Ramesh, and R. Kumar, “Nature-inspired designs in wind energy: A review,” Biomimetics, vol. 9, no. 2, 2024. REN21, Renewables 2024 Global Status Report. Paris, France: REN21 Secretariat, 2024. E. Salami, T. A. Ward, E. Montazer, and N. N. Ghazali, “A review of aerodynamic studies on dragonfly flight,” Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, vol. 233, no. 18, pp. 6519–6537, 2019. F. N. Shama and J. S. Jecha, “Experimental and numerical investigation on aerodynamic performance of wind turbine blades with dragonfly-inspired corrugated microstructures,” BIG-D, vol. 3, no. 1, 2025. W. Tian, Z. Yang, Q. Zhang, et al., “Bionic design of wind turbine blade based on long-eared owl's airfoil,” Applied Bionics and Biomechanics, vol. 2017, Art. ID 8504638, 2017. M. S. Triyogi, B. Sasongko, and H. Nugroho, “Computational fluid dynamics analysis in biomimetics applications: A review from aerospace engineering perspective,” Biomimetics, vol. 8, no. 3, 2023. H. Versteeg and W. Malalasekera, An Introduction to Computational Fluid Dynamics: The Finite Volume Method, 3rd ed. Harlow, U.K.: Pearson, 2022. J. F. V. Vincent, O. A. Bogatyreva, N. R. Bogatyrev, A. Bowyer, and A. K. Pahl, “Biomimetics: Its practice and theory,” Journal of the Royal Society Interface, vol. 3, no. 9, pp. 471–482, 2006.