NDLI: Effect of Reynolds number on leading edge vortex for a wing in unsteady motion

Content Provider	IEEE Xplore Digital Library
Author	Shahzad, A. Hamdani, H.R. Mumtaz, M.N. Parvez, K. Aqib, M.
Copyright Year	2013
Description	Author affiliation: Sch. of Aeronaut. Pakistan Air Force, Nat. Univ. of Sci. & Technol., Islamabad, Pakistan (Shahzad, A.; Hamdani, H.R.; Mumtaz, M.N.; Parvez, K.; Aqib, M.)
Abstract	The present study focuses on investigating the persistence of delayed stall for Micro Air Vehicles at Re-34,000. The motivation behind present research is to find out the effect of Reynolds number on aerodynamic force production and formation of leading edge vortex on a wing in unsteady motion. Computations are done on a corrugated wing in sweeping motion and pure translation at Reynolds number 3500 and 34,000. For sweeping motion, at 10 degree angle of attack, flow remain attached to the wing with no signs of leading edge vortex and the force coefficients at Re 34000 were higher than Re 3500 throughout the sweeping motion. For sweeping motion, at angle of attack of 40°, delayed stall continued to manifest itself at Re 34000. At Re 34000, the size of leading edge vortex was comparatively small but the strength of leading edge vortex core was relatively more and signs of vortex break down were eminent at 90 percent of wingspan. However, at Re 3500, signs of vortex break down were observed at 70 percent of wingspan. In pure translation, “stall absent” mechanism was not seen at any Re, as leading edge vortex was formed and it then shed into the wake. In short, it can be concluded that delayed stall continues to act as lift enhancement mechanism for MAV but flow structure and span wise vortex break down pattern changes with the change in Reynolds number.
Starting Page	181
Ending Page	188
File Size	2696364
Page Count	8
File Format	PDF
ISBN	9781467344258
e-ISBN	9781467344265
DOI	10.1109/IBCAST.2013.6512152
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-15
Publisher Place	Pakistan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Atmospheric modeling Computational modeling Force Delayed stall Lead Aerodynamics leading edge vortex unsteady motion Mathematical model corrugated wing Equations
Content Type	Text
Resource Type	Article

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