During the last decades, riblets have shown a potential for viscous drag reduction in turbulent boundary layers. Several investigations and measurements of skin-friction in the boundary layer over flat plates and on turbomachinery-type blades with ideal riblet geometry have been reported in the literature. The question of where riblets must be applied on the surface of a compressor blade is still not sufficiently answered. In a first step, the profile loss reduction by ideal triangular riblets with a trapezoidal groove and a constant geometry along the surface on the suction and pressure sides of a compressor blade is investigated. The results show a higher potential on the profile loss reduction by riblets on the suction side. In a second step, the effect of laser-structured ribs on the laminar separation bubble and the influence of these structures on the laminar boundary layer near the leading edge are investigated. After clarifying the best choices where riblets should be applied on the blade surface, a strategy for locally adapted riblets is presented. The suction side of a compressor blade is laser-structured with segmented riblets with a constant geometry in each segment. The measured profile loss reduction shows the increasing effect on the profile loss reduction of this locally adapted structure compared to a constant riblet-geometry along the surface. Furthermore, the particle deposition on a riblet-structured compressor blade is investigated and compared to the particle deposition on a smooth surface. Results show a primary particle deposition on the riblet tips followed by an agglomeration. The particle deposition on the smooth surface is stochastic.

References

References
1.
Oehlert
,
K.
, and
Seume
,
J.
,
2006
, “
Exploratory Experiments on Machined Riblets on Compressor Blades
,”
Proceedings of Fluids Engineering Division Summer Meeting (FEDSM2006)
,
Miami, FL
, July 17–20,
ASME
Paper No. FEDSM2006-98093.10.1115/FEDSM2006-98093
2.
Walsh
,
M. J.
,
1983
, “
Riblets as a Viscous Drag Reduction Technique
,”
AIAA J
,
21
(
4
), pp.
485
486
.10.2514/3.60126
3.
Reif
,
W.-E.
,
1985
,
Squamation and Ecology of Sharks
, Vol. 78,
Courier Forschungsinstitut Senckenberg
,
Frankfurt, Germany
.
4.
Fang
,
C.
,
Yan-Ping
,
T.
, and
Mao-Zhang
,
C.
,
1990
, “
An Experimental Investigation of Loss Reduction With Riblets on Cascade Blade Surfaces and Isolated Airfoils
,”
Gas Turbine and Aeroengine Congress and Exposition
,
Brussels, Belgium
,
June 11–14, ASME Paper No. 90-GT-207
.
5.
Bechert
,
D. W.
,
Bruse
,
M.
,
Hage
,
W.
,
van der Hoeven
,
J. G. T.
, and
Hoppe
,
G
,
1997
, “
Experiments on Drag-Reducing Surfaces and Their Optimization With an Adjustable Geometry
,”
J. Fluid Mech.
,
338
, pp.
59
87
.10.1017/S0022112096004673
6.
Nagao
,
S.
, and
Breugelmanns
,
F.A.E.
,
1999
, “
Investigation of Riblets in a CDB, DCA and 65-S Compressor Cascade
,”
Proceedings of International Gas Turbines Congress, Kobe, Japan, November 14–19, Paper No. TS-25
.
7.
Boese
,
M.
, and
Fottner
,
L.
,
2002
, “
Effects of Riblets on the Loss Behaviour of a Highly Loaded Compressor Cascade
,”
Proceedings of ASME Turbo Expo
,
Amsterdam, The Netherlands
,
June 3–6
,
ASME
Paper No. GT2002-30438.10.1115/GT2002-30438
8.
Oehlert
,
K.
,
Seume
,
J.
,
Siegel
,
F.
,
Ostendorf
,
A.
,
Wang
,
B.
,
Denkena
,
B.
,
Vynnyk
,
T.
,
Reithmeier
,
E.
,
Hage
,
W.
,
Knobloch
,
K.
, and
Meyer
,
R.
,
2007
, “
Exploratory Experiments on Machined Riblets for 2-D Compressor Blades
,”
Proceedings of International Mechanical Engineering Congress and Exposition (IMECE2007)
,
Seattle, WA
,
November 11–15, ASME Paper No. IMECE 2007-43457
.
9.
Denkena
,
B.
,
Koehler
,
J.
, and
Wang
,
B.
,
2010
, “
Manufacturing of Functional Riblet Structures by Profile Grinding
,”
CIRP J. Manu. Sci. Techn.
,
3
, pp.
14
26
.10.1016/j.cirpj.2010.08.001
10.
Siegel
,
F.
,
Klug
,
U.
, and
Kling
,
R.
,
2009
, “
Extensive Micro-Structuring of Metals Using Picosecond Pulses–Ablation Behavior and Industrial Relevance
,”
J. Laser Micro/Nanoengineering
,
4
, pp.
104
110
.10.2961/jlmn.2009.02.0006
11.
Vynnyk
,
T.
,
Schultheis
,
T.
,
Fahlbusch
,
T.
, and
Reithmeier
,
E.
,
2010
, “
3D-Measurement With the Stereo Scanning Electron Microscope on Sub-Micrometer Structures
,”
J. Eur. Opt. Soc.
,
5
, p.
10038s
.10.2971/jeos.2010.10038s
12.
Van Dyke
,
M.
,
1982
,
An Album of Fluid Motion
,
Parabolic Press
,
Stanford, CA
.
13.
Bechert
,
D. W.
,
Bruse
,
M.
,
Hage
,
W.
, and
Meyer
,
R.
,
2000
, “
Fluid Mechanics of Biological Surfaces and Their Technological Application
,”
Naturwissenschaften
,
87
(4), pp.
157
171
.10.1007/s001140050696
14.
Drela
,
M.
, and
Giles
,
M.B.
,
1987
, “
Viscous-Inviscid Analysis of Transonic and Low Reynolds Number Airfoils
,”
AIAA J
,
25
(
10
), pp.
1347
1355
.10.2514/3.9789
15.
Harbecke
,
U.
,
Riess
,
W.
, and
Seume
,
J.
,
2002
, “
The Effect of Milling Process Induced Coarse Surface Texture on Aerodynamic Turbine Profile Losses
,”
Proceedings of ASME Turbo Expo (GT2002)
,
Amsterdam, The Netherlands
, June 3–6,
ASME
Paper No. GT2002-30333.10.1115/GT2002-30333
16.
Amecke
,
J.
,
1967
, “
Auswertung von Nachlaufmessungen an ebenen Schaufelgittern
,”
Report 67 A 49, AVA
,
Göttingen, Germany
.
17.
Wilson
,
D.G.
, and
Korakianitis
,
T.
,
1998
,
The Design of High Efficiency Turbomachinery and Gas Turbines
,
2nd ed.
,
Prentice Hall
,
Upper Saddle River, NJ
.
18.
Lietmeyer
,
C.
,
Oehlert
,
K.
, and
Seume
,
J. R.
,
2011
, “
Optimal Application of Riblets on Compressor Blades and Their Contamination Behaviour
,”
Proceedings of ASME Turbo Expo (GT2011)
,
Vancouver, Canada
, June 6–11,
ASME
Paper No. GT2011-46855
.10.1115/GT2011-46855
19.
World Health Organization
,
2006
, “
Air Quality Guidelines, Global Update 2005
,”
WHO Regional Office for Europe
, pp.
31
40
.
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