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Multisensor Hot Wire Vorticity Probe Measurements of the Formation Field of Two Corotating Vortices

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Abstract

Experimental evidence is reported, regarding the formation of a pair of co-rotating tip vortices by a split wing configuration, consisting of two half wings at equal and opposite angles of attack. Simultaneous measurements of the three-dimensional vector fields of velocity and vorticity were conducted on a cross plane at a downstream distance corresponding to 0.3 cord lengths (near wake), using an in-house constructed 12-sensor hot wire anemometry vorticity probe. The probe consists of three closely separated orthogonal 4-wire velocity sensor arrays, measuring simultaneously the three-dimensional velocity vector at three closely spaced locations on a cross plane of the flow filed. This configuration makes possible the estimation of spatial velocity derivatives by means of a forward difference scheme of first order accuracy. Velocity measurements obtained with an X-wire are also presented for comparison. In this near wake location, the flow field is dictated by the pressure distribution established by the flow around the wings, mobilizing large masses of air and leading to the roll up of fluid sheets. Fluid streams penetrating between the wings collide, creating on the cross plane flow a stagnation point and an “impermeable” line joining the two vortex centres. Along this line fluid is directed towards the two vortices, expanding their cores and increasing their separation distance. This feeding process generates a dipole of opposite sign streamwise mean vorticity within each vortex. The rotational flow within the vortices obligates an adverse streamwise pressure gradient leading to a significant streamwise velocity deficit characterizing the vortices. The turbulent flow field is the result of temporal changes in the intensity of the vortex formation and changes in the position of the cores (wandering).

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  1. Laboratory of Applied Thermodynamics, Mechanical Engineering and Aeronautics Department, University of Patras, 265 04, Patras-Rio, Greece

    Alexandros Romeos, Thrassos Panidis & Demos D. Papailiou

  2. Hellenic Aerospace Industry S.A., P.O. Box 23, 320 09, Schimatari, Greece

    Georgios Lemonis

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  1. Alexandros Romeos
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  2. Georgios Lemonis
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  4. Demos D. Papailiou
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Romeos, A., Lemonis, G., Panidis, T. et al. Multisensor Hot Wire Vorticity Probe Measurements of the Formation Field of Two Corotating Vortices. Flow Turbulence Combust 83, 153–183 (2009). https://doi.org/10.1007/s10494-008-9193-8

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