Abstract
This paper studies the effect of perturbation to the breakdown of the leading-edge vortices over delta wings. The passive perturbation in the normal direction is achieved by installing the hemisphere-like bulges on the delta wing along the projection of the vortices. The key purpose of this perturbation is to delay or suppress vortex breakdown over delta wings according to the self-induction mechanism theory. The design of bulge-like surface for delta wings offers a minimization of initial vorticity gradient and an elimination of linearly mutual induction within the vortex core. Three delta wings with swept angles of 60°, 65dg and 70° have been used. Dye flow visualization and force measurement in different water tunnels are performed at the water speed of U=0.10, 0.15, 0.20 and 0.25 m/s. In flow visualization, the results show contributions of bulges as perturbation to leading-edge vortices. The best outcome of perturbing the vortex core occurs in the case of the 65° delta wing. The breakdown positions on the 65° delta wing are delayed in almost the entire range of angles of attack, and that, the results are presented here.
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Sutthiphong Srigrarom: He received his M.Sc. in Aeronautics and Astronautics in 1998, and his Ph.D. in 2001, both from University of Washington, Seattle, USA. In 2002, he joined Nanyang Technological University (NTU), School of Mechanical and Aerospace Engineering in Singapore, as an assistant professor in aeronautical engineering. At NTU, he is in charge of water channels and wind tunnel lab facilities. His current research interests are Vortex Dynamics, Flow Visualization (both qualitative and quantitative), PIV, and Flow-Induced Vibration.
Nuttawut Lewpiriyawong: He received his B.Eng. in Mechanical Engineering in 2001 from King Mongkut’s Institute of Technology Ladkrabang (KMIT’L), Thailand, and his M.Eng. in Mechanical Engineering from Nanyang Technological University (NTU) in 2006. Currently, he is doing Ph.D. in Mechanical Engineering in Nanyang Technological University (NTU). His interests are Vortex Dynamics, Flow visulization, and Microfluidic.
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Srigrarom, S., Lewpiriyawong, N. Controlled Vortex Breakdown on Modified Delta Wings. J Vis 10, 299–307 (2007). https://doi.org/10.1007/BF03181697
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DOI: https://doi.org/10.1007/BF03181697