Details
| Original language | English |
|---|---|
| Article number | 041008 |
| Journal | Journal of turbomachinery |
| Volume | 135 |
| Issue number | 3 |
| Early online date | 3 Jun 2013 |
| Publication status | Published - Jul 2013 |
Abstract
Since Oehlert et al. (2007, "Exploratory Experiments on Machined Riblets for 2-D Compressor Blades," Proceedings of International Mechanical Engineering Conference and Exposition 2007, Seattle, WA, IMECE2007-43457), significant improvements in the manufacturing processes of riblets by laser structuring and grinding have been achieved. In the present study, strategies for manufacturing small-scale grooves with a spacing smaller than 40 lm by metal bonded grinding wheels are presented. For the laserstructuring process, significant improvements of the production time by applying diffractive optical elements were achieved. Finally, strategies for evaluating the geometrical quality of the small-scale surface structures are shown and results obtained with two different measuring techniques (SEM and confocal microscope) are compared with each other. The aerodynamic impact of the different manufacturing processes is investigated based upon skin friction reduction data obtained on flat plates as well as the profile-loss reduction of riblet-structured compressor blades measured in a linear cascade wind tunnel. Numerical simulations with MISES embedded in a Monte Carlo simulation (MCS) were performed in order to calculate the profile-loss reduction of a blade structured by grinding to define further improvements of the riblet-geometry. A numerical as well as experimental study quantifying the relevant geometrical parameters indicate how further improvements from the present 4% reduction in skin friction can be achieved by an additional decrease of the riblet tip diameter and a more trapezoidal shape of the groove in order to realize the 8% potential reduction.
ASJC Scopus subject areas
- Engineering(all)
- Mechanical Engineering
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In: Journal of turbomachinery, Vol. 135, No. 3, 041008, 07.2013.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Recent Advances in Manufacturing of Riblets on Compressor Blades and Their Aerodynamic Impact
AU - Lietmeyer, Christoph
AU - Denkena, Berend
AU - Krawczyk, Thomas
AU - Klin, Rainer
AU - Overmeyer, Ludger
AU - Wojakowski, Bodo
AU - Reithmeier, Eduard
AU - Scheuer, Renke
AU - Vynnyk, Taras
AU - Seume, Joerg R.
PY - 2013/7
Y1 - 2013/7
N2 - Since Oehlert et al. (2007, "Exploratory Experiments on Machined Riblets for 2-D Compressor Blades," Proceedings of International Mechanical Engineering Conference and Exposition 2007, Seattle, WA, IMECE2007-43457), significant improvements in the manufacturing processes of riblets by laser structuring and grinding have been achieved. In the present study, strategies for manufacturing small-scale grooves with a spacing smaller than 40 lm by metal bonded grinding wheels are presented. For the laserstructuring process, significant improvements of the production time by applying diffractive optical elements were achieved. Finally, strategies for evaluating the geometrical quality of the small-scale surface structures are shown and results obtained with two different measuring techniques (SEM and confocal microscope) are compared with each other. The aerodynamic impact of the different manufacturing processes is investigated based upon skin friction reduction data obtained on flat plates as well as the profile-loss reduction of riblet-structured compressor blades measured in a linear cascade wind tunnel. Numerical simulations with MISES embedded in a Monte Carlo simulation (MCS) were performed in order to calculate the profile-loss reduction of a blade structured by grinding to define further improvements of the riblet-geometry. A numerical as well as experimental study quantifying the relevant geometrical parameters indicate how further improvements from the present 4% reduction in skin friction can be achieved by an additional decrease of the riblet tip diameter and a more trapezoidal shape of the groove in order to realize the 8% potential reduction.
AB - Since Oehlert et al. (2007, "Exploratory Experiments on Machined Riblets for 2-D Compressor Blades," Proceedings of International Mechanical Engineering Conference and Exposition 2007, Seattle, WA, IMECE2007-43457), significant improvements in the manufacturing processes of riblets by laser structuring and grinding have been achieved. In the present study, strategies for manufacturing small-scale grooves with a spacing smaller than 40 lm by metal bonded grinding wheels are presented. For the laserstructuring process, significant improvements of the production time by applying diffractive optical elements were achieved. Finally, strategies for evaluating the geometrical quality of the small-scale surface structures are shown and results obtained with two different measuring techniques (SEM and confocal microscope) are compared with each other. The aerodynamic impact of the different manufacturing processes is investigated based upon skin friction reduction data obtained on flat plates as well as the profile-loss reduction of riblet-structured compressor blades measured in a linear cascade wind tunnel. Numerical simulations with MISES embedded in a Monte Carlo simulation (MCS) were performed in order to calculate the profile-loss reduction of a blade structured by grinding to define further improvements of the riblet-geometry. A numerical as well as experimental study quantifying the relevant geometrical parameters indicate how further improvements from the present 4% reduction in skin friction can be achieved by an additional decrease of the riblet tip diameter and a more trapezoidal shape of the groove in order to realize the 8% potential reduction.
UR - http://www.scopus.com/inward/record.url?scp=84888046227&partnerID=8YFLogxK
U2 - 10.1115/1.4007590
DO - 10.1115/1.4007590
M3 - Article
AN - SCOPUS:84888046227
VL - 135
JO - Journal of turbomachinery
JF - Journal of turbomachinery
SN - 0889-504X
IS - 3
M1 - 041008
ER -