Details
| Original language | English |
|---|---|
| Title of host publication | Proceedings of ASME Fluids Engineering Division Summer Meeting 2006, FEDSM2006 |
| Pages | 415-424 |
| Number of pages | 10 |
| Publication status | Published - 2006 |
| Event | 2006 ASME Joint U.S.- European Fluids Engineering Division Summer Meeting, FEDSM2006 - Miami, FL, United States Duration: 17 Jul 2006 → 20 Jul 2006 |
Publication series
| Name | Proceedings of ASME Fluids Engineering Division Summer Meeting 2006, FEDSM2006 |
|---|---|
| Volume | 1 SYMPOSIA |
Abstract
During the last decades, riblets have shown a potential for viscous drag reduction. Several investigations and measurements of skin-friction have been completed in the boundary layer over a flat plate carrying riblets, mostly on thin foils. The purpose of the present study is to investigate machined riblet structures which are fabricated by grinding and laser machining. First tests dealing with machined riblets on flat plates are presented in this paper. Future investigations will examine the aerodynamic behaviour of machined riblets on NACA compressor blades. The specimens, flat plates and compressor blades, are tested in a linear cascade wind tunnel. Perfect trapezoidal riblets have been designed specifically to the flow parameters in this wind tunnel. Foils carrying the ideal riblets provide a basis for comparison with the riblets created by grinding and by laser machining. Parameters describing the geometry and the deviation from ideal riblets have been developed. It turned out that it is quite difficult to produce riblets satisfying the ideal geometrical requirements by machining. However, measurements in the wake of flat plates show that the laser shaped riblets as well as the ground riblets reduce pressure loss coefficients by up to 3.6%.
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Proceedings of ASME Fluids Engineering Division Summer Meeting 2006, FEDSM2006. 2006. p. 415-424 (Proceedings of ASME Fluids Engineering Division Summer Meeting 2006, FEDSM2006; Vol. 1 SYMPOSIA).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Exploratory experiments on machined riblets on compressor blades
AU - Oehlert, Karsten
AU - Seume, Joerg R.
PY - 2006
Y1 - 2006
N2 - During the last decades, riblets have shown a potential for viscous drag reduction. Several investigations and measurements of skin-friction have been completed in the boundary layer over a flat plate carrying riblets, mostly on thin foils. The purpose of the present study is to investigate machined riblet structures which are fabricated by grinding and laser machining. First tests dealing with machined riblets on flat plates are presented in this paper. Future investigations will examine the aerodynamic behaviour of machined riblets on NACA compressor blades. The specimens, flat plates and compressor blades, are tested in a linear cascade wind tunnel. Perfect trapezoidal riblets have been designed specifically to the flow parameters in this wind tunnel. Foils carrying the ideal riblets provide a basis for comparison with the riblets created by grinding and by laser machining. Parameters describing the geometry and the deviation from ideal riblets have been developed. It turned out that it is quite difficult to produce riblets satisfying the ideal geometrical requirements by machining. However, measurements in the wake of flat plates show that the laser shaped riblets as well as the ground riblets reduce pressure loss coefficients by up to 3.6%.
AB - During the last decades, riblets have shown a potential for viscous drag reduction. Several investigations and measurements of skin-friction have been completed in the boundary layer over a flat plate carrying riblets, mostly on thin foils. The purpose of the present study is to investigate machined riblet structures which are fabricated by grinding and laser machining. First tests dealing with machined riblets on flat plates are presented in this paper. Future investigations will examine the aerodynamic behaviour of machined riblets on NACA compressor blades. The specimens, flat plates and compressor blades, are tested in a linear cascade wind tunnel. Perfect trapezoidal riblets have been designed specifically to the flow parameters in this wind tunnel. Foils carrying the ideal riblets provide a basis for comparison with the riblets created by grinding and by laser machining. Parameters describing the geometry and the deviation from ideal riblets have been developed. It turned out that it is quite difficult to produce riblets satisfying the ideal geometrical requirements by machining. However, measurements in the wake of flat plates show that the laser shaped riblets as well as the ground riblets reduce pressure loss coefficients by up to 3.6%.
UR - http://www.scopus.com/inward/record.url?scp=33847039166&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:33847039166
SN - 0791847500
SN - 9780791847503
T3 - Proceedings of ASME Fluids Engineering Division Summer Meeting 2006, FEDSM2006
SP - 415
EP - 424
BT - Proceedings of ASME Fluids Engineering Division Summer Meeting 2006, FEDSM2006
T2 - 2006 ASME Joint U.S.- European Fluids Engineering Division Summer Meeting, FEDSM2006
Y2 - 17 July 2006 through 20 July 2006
ER -