The ground effect on the aerodynamic loading and leading-edge vortex (LEV) flow generated by a slender delta wing was investigated experimentally. Both the lift and drag forces were found to increase with reducing ground distance (up to 50% of the wing chord). The lift increment was also found to be the greatest at low angles of attack α and decreased rapidly with increasing ground distance and α. The ground effect-caused earlier wing stall was also accompanied by a strengthened LEV with an increased rotational speed and size compared to the baseline wing. The smaller the ground distance, the stronger the LEV and the earlier vortex breakdown became. Meanwhile, the vortex trajectory was also found to be located further inboard and above the delta wing in ground effect compared to its baseline-wing counterpart. Finally, for wing-in-ground effect (WIG) craft with delta-wing planform the most effective in-ground-effect flight should be kept within 10% of the wing chord.

References

1.
Rozhdestvensky
,
K. V.
,
2006
, “
Wing-in-Ground Effect Vehicles
,”
Prog. Aerosp. Sci.
,
42
(
3
), pp.
211
283
.
2.
von Kocivar
,
B.
,
1977
, “
Ram-Wing X-114: Floats, Skims, and Flies
,”
Popular Science
, R. J. Reynolds Tobacco Company, Winston-Salem, NC, pp.
70
73
.
3.
Katz
,
J.
, and
Levin
,
D.
,
1984
, “
Measurements of Ground Effect for Delta Wing
,”
J. Aircr.
,
21
(
6
), pp.
441
443
.
4.
Plotkin
,
A.
, and
Dobele
,
S. S.
,
1988
, “
Slender Wing in Ground Effect
,”
AIAA J.
,
26
(
4
), pp.
493
494
.
5.
Curry
,
R. E.
, and
Owens
,
L. R.
,
2003
, “Ground Effect Characteristics of the Tu-144 Supersonic Transport Airplane,” NASA Langley Research Center, Hampton, VA, Technical Report No.
NASA TM-2003-212035
.https://www.nasa.gov/centers/dryden/pdf/88750main_H-2510.pdf
6.
Qin
,
Y.
,
Qu
,
Q.
,
Liu
,
P.
,
Tian
,
Y.
, and
Lu
,
Z.
,
2015
, “
DDES Study of the Aerodynamic Forces and Flow Physics of a Delta Wing in Static Ground Effect
,”
Aerosp. Sci. Technol.
,
43
, pp.
423
436
.
7.
Qu
,
Q.
,
Lu
,
Z.
,
Guo
,
H.
,
Liu
,
P.
, and
Agarwal
,
R. K.
,
2015
, “
Numerical Investigation of the Aerodynamics of a Delta Wing in Ground Effect
,”
J. Aircr.
,
52
(
1
), pp.
329
340
.
8.
Jia
,
Q.
,
Yang
,
W.
, and
Yang
,
Z.
,
2016
, “
Numerical Study on Aerodynamics of Banked Wing in Ground Effect
,”
Int. J. Nav. Archit. Ocean Eng.
,
8
(
2
), pp.
209
217
.
9.
Nelson
,
R. C.
, and
Pelletier
,
A.
,
2003
, “
The Unsteady Aerodynamics of Slender Wings and Aircraft Undergoing Large Amplitude Maneuvers
,”
Prog. Aerosp. Sci.
,
39
(
2–3
), pp.
185
248
.
10.
Gursul
,
I.
,
2005
, “
Review of Unsteady Vortex Flows Over Slender Delta Wings
,”
J. Aircr.
,
42
(
2
), pp.
299
319
.
11.
Hsiun
,
C. M.
, and
Chen
,
C. K.
,
1996
, “
Aerodynamic Characteristics of a Two-Dimensional Airfoil With Ground Effect
,”
J. Aircr.
,
33
(
2
), pp.
386
392
.
12.
Moore
,
N.
,
Wilson
,
P. A.
, and
Peters
,
A. J.
,
2002
, “
An Investigation Into Wing in Ground Effect Airfoil Geometry
,”
RTO-MP-095 SCI Symposium on Challenges in Dynamics, System Identification, Control and Handling Qualities for Land, Air, Sea and Space Vehicles
(
RTO-MP-095
), Berlin, May 13–15, pp.
11
30
.https://eprints.soton.ac.uk/51083/1/51083.pdf
13.
Ahmed
,
M. R.
,
Takasaki
,
T.
, and
Kohama
,
Y.
,
2007
, “
Aerodynamics of a NACA 4412 Airfoil in Ground Effect
,”
AIAA J.
,
45
(
1
), pp.
37
47
.
14.
Lee
,
T.
,
Majeed
,
A.
,
Siddiqui
,
B.
, and
Tremblay-Dionne
,
V.
,
2017
, “
Impact of Ground Proximity on the Aerodynamic Properties of an Unsteady Airfoil
,”
J. Aerosp. Eng.
, epub.
15.
Altaf
,
A.
,
Omar
,
A. A.
,
Asrar
,
W.
, and
Jamaluddin
,
H. B. L.
,
2011
, “
Study of the Reverse Delta Wing
,”
J. Aircr.
,
48
(
1
), pp.
277
286
.
16.
Lee
,
T.
, and
Ko
,
L. S.
,
2016
, “
Experimental Study of the Vortex Flow and Aerodynamic Characteristics of a Reverse Delta Wing
,”
J. Aerosp. Eng.
,
230
(
6
), pp.
1126
1138
.
17.
Lee
,
T.
,
2016
, “
Impact of Gurney Flaplike Strips on the Aerodynamic and Vortex Flow Characteristics of a Reverse Delta Wing
,”
ASME J. Fluids Eng.
,
138
(
6
), p.
061104
.
18.
Lee
,
T.
,
Ko
,
L. S.
, and
Tremblay-Dionne
,
V.
,
2017
, “
Effect of Anhedral on a Reverse Delta Wing
,”
J. Aerosp. Eng.
, epub.
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