Details
Original language | English |
---|---|
Pages (from-to) | 177-187 |
Number of pages | 11 |
Journal | Journal of the Global Power and Propulsion Society |
Volume | 7 |
Publication status | Published - 14 Jun 2023 |
Abstract
In recent years, the research on roughness has focused on various roughness features, rather than the roughness height only, in order to improve the understanding of roughness effects on wall bounded flows. A special focus is placed on the skewness of the roughness height profile. The skew-ness measures whether the height profile is dominated by negative or positive roughness elements. Surfaces with both features can be found on worn blades: On the leading edge, roughness is caused by the impact of particles resulting in a negative skewness. Rough surfaces around the trailing edge, however, develop due to depositions leading to a positive skewness. In this paper, rough surfaces taken from a compressor blade of an aero engine are systematically varied to investigate the isolated effect of skew-ness on aerodynamic losses. By direct numerical simulations of a periodic flow channel. The results show that the skewness has a major influence on loss generation. Based on these results, an existing model which essentially uses the shape-and-density parameter, is extended by a skewness factor. The modified correlation predicts the influence of the rough surfaces investigated well.
Keywords
- DNS, modeling, roughness, skewness, wall bounded flows
ASJC Scopus subject areas
- Engineering(all)
- Aerospace Engineering
- Engineering(all)
- Mechanical Engineering
- Engineering(all)
- Industrial and Manufacturing Engineering
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In: Journal of the Global Power and Propulsion Society, Vol. 7, 14.06.2023, p. 177-187.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Systematic Roughness Variation to Model the Influence of Skewness on Wall Bounded Flows
AU - Kurth, Sebastian
AU - Cengiz, Kenan
AU - Möller, Daniel
AU - Wein, Lars
AU - Seume, Joerg R.
N1 - Funding Information: The authors would like to thank the BMWi and DFG for the support. The authors would also like to thank the North-German Supercomputing Alliance (HLRN) for the HPC resources that have contributed to the development of the research results presented here. Funding Information: Federal Ministry for Economic Affairs and Energy (BMWi) within their aviation research program (LuFo) under the funding code 20T1719C Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) within the Collaborative Research Center (CRC) 871 “Regeneration of Complex Capital Goods.
PY - 2023/6/14
Y1 - 2023/6/14
N2 - In recent years, the research on roughness has focused on various roughness features, rather than the roughness height only, in order to improve the understanding of roughness effects on wall bounded flows. A special focus is placed on the skewness of the roughness height profile. The skew-ness measures whether the height profile is dominated by negative or positive roughness elements. Surfaces with both features can be found on worn blades: On the leading edge, roughness is caused by the impact of particles resulting in a negative skewness. Rough surfaces around the trailing edge, however, develop due to depositions leading to a positive skewness. In this paper, rough surfaces taken from a compressor blade of an aero engine are systematically varied to investigate the isolated effect of skew-ness on aerodynamic losses. By direct numerical simulations of a periodic flow channel. The results show that the skewness has a major influence on loss generation. Based on these results, an existing model which essentially uses the shape-and-density parameter, is extended by a skewness factor. The modified correlation predicts the influence of the rough surfaces investigated well.
AB - In recent years, the research on roughness has focused on various roughness features, rather than the roughness height only, in order to improve the understanding of roughness effects on wall bounded flows. A special focus is placed on the skewness of the roughness height profile. The skew-ness measures whether the height profile is dominated by negative or positive roughness elements. Surfaces with both features can be found on worn blades: On the leading edge, roughness is caused by the impact of particles resulting in a negative skewness. Rough surfaces around the trailing edge, however, develop due to depositions leading to a positive skewness. In this paper, rough surfaces taken from a compressor blade of an aero engine are systematically varied to investigate the isolated effect of skew-ness on aerodynamic losses. By direct numerical simulations of a periodic flow channel. The results show that the skewness has a major influence on loss generation. Based on these results, an existing model which essentially uses the shape-and-density parameter, is extended by a skewness factor. The modified correlation predicts the influence of the rough surfaces investigated well.
KW - DNS
KW - modeling
KW - roughness
KW - skewness
KW - wall bounded flows
UR - http://www.scopus.com/inward/record.url?scp=85162931143&partnerID=8YFLogxK
U2 - 10.33737/jgpps/163089
DO - 10.33737/jgpps/163089
M3 - Article
AN - SCOPUS:85162931143
VL - 7
SP - 177
EP - 187
JO - Journal of the Global Power and Propulsion Society
JF - Journal of the Global Power and Propulsion Society
ER -