Low Re, High Alpha Wing Aerodynamics for Micro Air Vehicle Applications

Swanson, Taylor A.; Isaac, Kakkattukuzhy M.

doi:10.2514/6.2008-421

Cited by 3 publications

(1 citation statement)

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“…Owing to the thinness and small size of flat plate in low Reynolds number flows, mounting test model in wind tunnel without support interference and measuring quantities with adequate accuracy has always been challenging. This concern, however, seems to be addressed in numerical investigations by several researchers covering a wide range of low Reynolds number from a few thousand to a single digit value for both 2D and 3D configurations (Kunz 2003;Sun and Boyd 2004;Swanson and Issac 2008;Sun et al 2009;Taira and Colonius 2009). For very low Reynolds number below 20 but at Mach number of 0.2, Sun and Boyd (2004) reported that as the Reynolds number is decreased, the regions around leading and trailing edges are subjected to rarefied effects and moreover, lift to drag ratio drops below 1.…”

Section: Introductionmentioning

confidence: 97%

Kutta–Joukowsky theorem in viscous and unsteady flow

Sharma

Deshpande

2012

Exp Fluids

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Nominally two-dimensional air flow over a thin flat plate at low Reynolds number is investigated. The primary objective is to experimentally determine with good accuracy the small magnitude lift force, generated by the plate at various angles of attack, by means of application of the Kutta-Joukowsky theorem where circulation is obtained from the line integral of velocity around the flat plate using non-invasive laser doppler velocimeter. Specific focus is on assessing applicability of the KuttaJoukowsky theorem, originally theorized for inviscid and steady flow, in the post-stall region. At high angles of attack, due to severe flow separation from both the edges of the flat plate and occurrence of periodic vortex shedding, wake flow is found to be highly viscous, turbulent and unsteady. Nevertheless, the results show a remarkably good agreement with previous investigations in both the linear range and the non-linear range of the lift curve without any correction applied to the data. The line integral of velocity along the rectangular loop enclosing the flat plate shows that the vertical components, albeit smaller in magnitude, possess the same sign and hence are additive in contribution to the circulation, whereas the horizontal components possess opposite signs and hence are subtractive in their contribution to the circulation. The paper presents some interesting and hitherto undisclosed features of flow field around the flat plate.

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