Lifting Wake Experimental Data

Parent Publications: J Miranda and W J Devenport, "Two-point measurements in trailing vortices", AIAA 34th Aerospace Sciences Meeting, Reno, Nevada, January 15-18, 1996.
J A Miranda and W J Devenport, "Turbulence structure in the spiral wake shed by a lifting wing", AIAA Journal in press.

For a summary description of this work see "Lifting wake" under "Projects", or click here. To download a zipped up copy the experimental data (data.zip) from this study click here. Total file size is around 112KBytes zipped and 390KBytes extracted.

Data format

Velocity measurements were made in grids to reveal the whole cross section of the tip vortex flow (file grid.dat). This file contains ASCII tab delimited data in 25 columns. For an explanation of the conditions and symbols see the parent publications. The following table lists the contents of each column.

Grid Data.txt

Data Column

Description

1

x/c

Streamwise Coordinate / Chord

2

z/c

Z Coordinate / Chord

3

y/c

Y Coordinate / Chord

4

Uref

Freestream Velocity

5

Re

Reynolds Number

6

T

Temperature

7

U

Mean Streamwise Velocity / Freestream Velocity

8

V

Mean V Velocity / Freestream Velocity

9

W

Mean W Velocity / Freestream Velocity

10

u2

(Fluctuating u Velocity)2 / (Freestream Velocity)2

11

v2

(Fluctuating v Velocity)2 / (Freestream Velocity)2

12

w2

(Fluctuating w Velocity)2 / (Freestream Velocity)2

13

u w

(Fluctuating u Velocity) (Fluctuating w Velocity) / (Freestream Velocity)2

14

v w

(Fluctuating v Velocity) (Fluctuating w Velocity) / (Freestream Velocity)2

15

u v

(Fluctuating u Velocity) (Fluctuating v Velocity) / (Freestream Velocity)2

16

u3

(Fluctuating u Velocity)3 / (Freestream Velocity)3

17

w3

(Fluctuating w Velocity)3 / (Freestream Velocity)3

18

v3

(Fluctuating v Velocity)3 / (Freestream Velocity)3

19

u2 w

(Fluctuating u Velocity)2 (Fluctuating w Velocity) / (Freestream Velocity)3

20

u w2

(Fluctuating w Velocity)2 (Fluctuating u Velocity) / (Freestream Velocity)3

21

w2 v

(Fluctuating w Velocity)2 (Fluctuating v Velocity) / (Freestream Velocity)3

22

w v2

(Fluctuating v Velocity)2 (Fluctuating w Velocity) / (Freestream Velocity)3

23

u2 v

(Fluctuating u Velocity)2 (Fluctuating v Velocity) / (Freestream Velocity)3

24

u v2

(Fluctuating v Velocity)2 (Fluctuating u Velocity) / (Freestream Velocity)3

25

u v w

(Fluctuating u Velocity) (Fluctuating v Velocity) (Fluctuating w Velocity) / (Freestream Velocity)3

Velocity measurements were also made in profiles to reveal the structure of the spiral wake (file profile.dat). The location of the profiles in the flow cross-section and the profile numbering system are illustrated in the following figure.

The file profile.dat contains ASCII tab delimited data in 28 columns. For an explanation of the conditions and symbols see the parent publications. The following table lists the contents of each column.

Normal Profile Data.txt

Data Column

1

Profile #

Profile Location #

2

x/c

Streamwise Coordinate / Chord

3

z/c

Z Coordinate / Chord

4

y/c

Y Coordinate / Chord

5

n/c

Normal (to centerline) Coordinate / Chord

6

s/c

Tangential (to centerline) Coordinate / Chord

7

Uref

Freestream Velocity

8

Re

Reynolds Number

9

T

Temperature

10

U

Mean Streamwise Velocity / Freestream Velocity

11

Vn

Mean Vn (Normal) Velocity / Freestream Velocity

12

Vs

Mean Vs (Tangential) Velocity / Freestream Velocity

13

u2

(Fluctuating u Velocity) 2 / (Freestream Velocity) 2

14

vn2

(Fluctuating vn Velocity) 2 / (Freestream Velocity) 2

15

vs2

(Fluctuating vs Velocity) 2 / (Freestream Velocity) 2

16

u vn

(Fluctuating u Velocity) (Fluctuating vn Velocity) / (Freestream Velocity) 2

17

vn vs

(Fluctuating vnVelocity) (Fluctuating vs Velocity) / (Freestream Velocity) 2

18

u vs

(Fluctuating u Velocity) (Fluctuating vsVelocity) / (Freestream Velocity) 2

19

u3

(Fluctuating u Velocity) 3 / (Freestream Velocity) 3

20

vn3

(Fluctuating vn Velocity) 3 / (Freestream Velocity) 3

21

vs3

(Fluctuating vsVelocity) 3 / (Freestream Velocity) 3

22

u2 vn

(Fluctuating u Velocity) 2 (Fluctuating vn Velocity) / (Freestream Velocity) 3

23

u vn2

(Fluctuating vn Velocity) 2 (Fluctuating u Velocity) / (Freestream Velocity) 3

24

vn2 vs

(Fluctuating vn Velocity) 2 (Fluctuating vsVelocity) / (Freestream Velocity) 3

25

vn vs2

(Fluctuating vsVelocity) 2 (Fluctuating vn Velocity) / (Freestream Velocity) 3

26

u2 vs

(Fluctuating u Velocity) 2 (Fluctuating vsVelocity) / (Freestream Velocity) 3

27

u vs2

(Fluctuating vsVelocity)2 (Fluctuating u Velocity) / (Freestream Velocity)3

28

u vn vs

(Fluctuating u Velocity) (Fluctuating vnVelocity) (Fluctuating vs Velocity) / (Freestream Velocity)3

The position coordinate system used here is defined as follows. 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. Coordinates n and s are measured perpendicular and parallel to the spiral wake centerline, defined as the locus of minimum mean axial velocity observed in the profiles.

Uncertainties in the measurements are given in the parent publication and in table 3 of W J Devenport, M C Rife, S I Liapis and G J Follin, Journal of Fluid Mechanics, vol. 312, pp. 67-106, 1996.

Please direct any questions or comments concerning the data or other aspects of this work to William Devenport at devenport@aoe.vt.edu.