Velocity measurements were made in grids to reveal the whole cross section of the tip vortex flow and in profiles measured through the vortex core. The following table lists the type of measurement, the conditions and the corresponding data file names.
| Conditions | Filenames | |||||
|---|---|---|---|---|---|---|
| Case | Rec | Angle of attack | x/c | Trip | Profile | Grid |
| 1 | 530000 | 5 deg. | 5 | 20-40% | 032b.dat | 034a.dat |
| 2 | 530000 | 5 deg. | 10 | 20-40% | 045b.dat | 050a.dat |
| 3 | 530000 | 5 deg. | 15 | 20-40% | 087b.dat | 086a.dat |
| 4 | 530000 | 5 deg. | 20 | 20-40% | 101b.dat | 099a.dat |
| 5 | 530000 | 5 deg. | 25 | 20-40% | 109b.dat | 107a.dat |
| 6 | 530000 | 5 deg. | 30 | 20-40% | 005b.dat | 016a.dat |
| 7 | 400000 | 5 deg. | 30 | 20-40% | 012b.dat | |
| 8 | 260000 | 5 deg. | 30 | 20-40% | 014b.dat | |
| 9 | 530000 | 7.5 deg. | 10 | 20-40% | 056b.dat | |
| 10 | 530000 | 3.75 deg. | 10 | 20-40% | 066b.dat | |
| 11 | 530000 | 2.5 deg. | 10 | 20-40% | 068b.dat | |
| 12 | 530000 | 5 deg. | 10 | None | 075b.dat | |
| 13 | 530000 | 5 deg. | 10 | 0-40% | 081b.dat | |
| 14* | 530000 | 5 deg. | 10 | 20-40% | 054b.dat | |
The files referred to are ASCII data files each with 25 columns. For an explanation of the conditions and symbols see the parent publication (Devenport et al., 1996). The following table lists the contents of each column.
| Column number | Variable |
|---|---|
| 1 | Unused or x/c (or x in inches for grid data) |
| 2, 3 | y/c, z/c (in inches for grid data) respectively |
| 4 | Free-stream velocity (m/s) Uinf |
| 5 | Reynolds number based on chord Rec |
| 6 | Flow temperature (deg. F) |
| 7-9 | Velocity components U, V, W respectively, normalizedon free stream velocity |
| 10-15 | Turbulence stresses u2, v2, w2, uv, vw, uwrespectively, normalized using free-stream velocity |
| 16-25 | Triple products u3, v3, w3, u2v, uv2, v2w, w2v,u2w, uw2, uvw respectively, normalized on free-stream velocity |
The position coordinate system used here is defined in figure 1. x is measured downstream from the leading edge of the wing tip, y inboard parallel to the wing span and z completes a right handed system. Coordinates y and z are measured from the apparent vortex center. Velocities are resolved into core-aligned components, U in along the core axis, V perpendicular to that in an x-y plane and W completing a right-handed system. Core (and thus rotation) angles used to obtain these components are plotted in the parent publication.
None of these measurements are corrected for the effects of wandering which are significant in and immediately surrounding the vortex core. See Devenport et al. (1996) for details on the likely magnitude of errors. Mean velocity profiles in the core regions corrected for wandering effects are presented in two files, 'vt.dat', containing tangential velocity profiles vtheta/Uinf vs. r/c, and 'ud.dat', containing axial velocity deficit profiles (U-Uinf)/Uinf vs. r/c, where the coordinate r is measured radially from the core center. Both files contain 14 pairs of columns for the 14 cases listed in the table at the top of this page (the ordering of the pairs of columns is the same as the case number). In each pair of columns, the first column is the radial coordinate, and the second is the mean velocity.
Uncertainties in the measurements are given in table 3 of Devenport et al.(1996).
Please direct any questions or comments concerning the data or other aspects of this work to William Devenport at devenport@aoe.vt.edu.
