CFD Based Numerical Analysis of Flow-Field Characteristics on Airfoils Experiencing Transverse Flow
DOI:
https://doi.org/10.26438/ijcse/v7i2.463468Keywords:
Transverse Flow, Cross-flow, NACA 0012, Dropped Airfoil, Flat Plate, Perpendicular FlowAbstract
In the presented work, the flow-field around dropped airfoils was investigated to establish a correlation with transverse flow on a flat plate. This scenario relates to falling maple seeds and developing a fundamental understanding of the how the forces and drag coefficients develop prior to rotation. Understanding the development of these forces will lead to understanding the characteristics of maple seeds (and other auto-rotating seeds) that cause auto-rotation and development of leading-edge vortices. Using CFD, a thin, almost 2D airfoil was placed in a 3D environment and dropped through free space. Flow around the dropped airfoil was accelerated by gravity considerations. The resulting surface forces were evaluated through comparison of coefficient of drag values for transverse flow on a flat plate. The analysis of the forces demonstrated that the drag coefficient values on the lower surface of NACA 0012 and E63 airfoils profile were found to be similar to the flat plate values. The convex NACA 0012 airfoil experienced larger surface forces than flat plate and the concave E63 airfoil experienced smaller surface forces than flat plate. This work also demonstrates that coefficient of drag varies with time.
References
[1] K. Fregene, D. Sharp, C. Bolden, J. King, C. Stoneking, S. Jameson, “Autonomous Guidance and Control of a Biomimetic Single-Wing MAV”, In the Proceedings of the Unmanned Systems Conference; pp. 1-12, 2016.
[2] S. Jameson, B. Satterfield, C. Bolden, N. Allen, H. Youngren, “SAMARAI nano air vehicle a revolution in flight”, In the proceedings of Association for Unmanned Vehicle Systems International Unmanned Systems North America; pp. 1–15, 2007.
[3] J. R. Holden, T. M. Caley, and M. G. Turner, “Maple Seed Performance as a Wind Turbine,” In the Proceedings of 53rd AIAA Aerospace Sciences Meeting, 2015.
[4] R. K. V. Gadamsetty, J. Loganathan, V. K. Balaramudu, and A. Rao, “Alternate Wind Turbine Blade Planform Design Studies for Low Wind Speeds,” Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy, 2015.
[5] D. Lentink, W. B. Dickson, J. L. V. Leeuwen, and M. H. Dickinson, “Leading-Edge Vortices Elevate Lift of Autorotating Plant Seeds,” Science, vol. 324, no. 5933, pp. 1438–1440, 2009.
[6] I.H. Arroyo, D. Rezgui, R. Theunissen, “Analytical Model for Leading-Edge Vortex Lift on Rotating Samara Seeds: Development and Validation,” In Proceedings of Applied Aerodynamics Conference 2016, United Kingdom, 2016.
[7] C.L. Ladera, and P. A. Pineda. "The Physics of the Spectacular Flight of the Triplaris Samaras." Latin-American Journal of Physics Education vol. 3, no. 3, pp. 557-565, 2009.
[8] R. Fang, Y. Zhang, and Y. Liu, “Aerodynamics and Flight Dynamics of Free-Falling Ash Seeds,” World Journal of Engineering and Technology, vol. 5, no. 4, pp. 105–116, 2017.
[9] W. Hu, K. K. Choi, O. Zhupanska, and J. H. Buchholz, “Integrating variable wind load, aerodynamic, and structural analyses towards accurate fatigue life prediction in composite wind turbine blades,” Structural and Multidisciplinary Optimization, vol. 53, no. 3, pp. 375–394, 2015.
[10] N. Sørensen and J. Michelsen, “Drag Prediction for Blades at High Angle of Attack Using CFD,” 42nd AIAA Aerospace Sciences Meeting and Exhibit, 2004.
[11] X. Tian, M. C. Ong, J. Yang, and D. Myrhaug, “Large-eddy simulations of flow normal to a circular disk at Re=1.5×105,” Computers & Fluids, vol. 140, pp. 422–434, 2016.
[12] C. Ostowari and D. Naik, “Post-stall wind tunnel data for NACA 44XX series airfoil sections,” Wind Engineering, vol. 8, no. 3, pp. 176–194, 1985.
[13] K. Cox and A. Echtermeyer, “Structural Design and Analysis of a 10MW Wind Turbine Blade,” Energy Procedia, vol. 24, pp. 194–201, 2012.
[14] J.A. Dahlberg, G. Ronsten,, “A Wind Tunnel Investigation of Tower Blockage Effects and Parking Loads on a E 5.35 M Horizontal Axis Wind Turbine,” In 5th European Wind Energy Association Conference and Exhibition; pp. 414–417, 1994.
[15] R. Shirzadeh, W. Weijtjens, P. Guillaume, and C. Devriendt, “The dynamics of an offshore wind turbine in parked conditions: a comparison between simulations and measurements,” Wind Energy, vol. 18, no. 10, pp. 1685–1702, 2014.
[16] K. Cox and A. Echtermeyer, “Structural Design and Analysis of a 10MW Wind Turbine Blade,” Energy Procedia, vol. 24, pp. 194–201, 2012.
[17] E. Simiu, and R.H. Scanlan, "Wind effects on structures: Fundamentals and application to design." John Willey & Sons Inc Publisher, USA 1996.
[18] S. F. Hoerner, Fluid-dynamic drag. Brick Town, NJ: Hoerner Fluid Dynamics, 1965.
[19] J. Nedić, B. Ganapathisubramani, and J. C. Vassilicos, “Drag and near wake characteristics of flat plates normal to the flow with fractal edge geometries,” Fluid Dynamics Research, vol. 45, no. 6, 2013.
[20] T. J. Mueller, Low Reynolds number aerodynamics: proceedings of the conference, Notre Dame, Indiana, USA, 5-7 June 1989. New York: Springer-Verlag, 1989.
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