Systematic Roughness Variation to Model the Influence of Skewness on Wall Bounded Flows

Research output: Contribution to journalArticleResearchpeer review

Authors

  • Sebastian Kurth
  • Kenan Cengiz
  • Daniel Möller
  • Lars Wein
  • Joerg R. Seume

External Research Organisations

  • MTU Aero Engines AG
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Details

Original languageEnglish
Pages (from-to)177-187
Number of pages11
JournalJournal of the Global Power and Propulsion Society
Volume7
Publication statusPublished - 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

Cite this

Systematic Roughness Variation to Model the Influence of Skewness on Wall Bounded Flows. / Kurth, Sebastian; Cengiz, Kenan; Möller, Daniel et al.
In: Journal of the Global Power and Propulsion Society, Vol. 7, 14.06.2023, p. 177-187.

Research output: Contribution to journalArticleResearchpeer review

Kurth, S, Cengiz, K, Möller, D, Wein, L & Seume, JR 2023, 'Systematic Roughness Variation to Model the Influence of Skewness on Wall Bounded Flows', Journal of the Global Power and Propulsion Society, vol. 7, pp. 177-187. https://doi.org/10.33737/jgpps/163089
Kurth, S., Cengiz, K., Möller, D., Wein, L., & Seume, J. R. (2023). Systematic Roughness Variation to Model the Influence of Skewness on Wall Bounded Flows. Journal of the Global Power and Propulsion Society, 7, 177-187. https://doi.org/10.33737/jgpps/163089
Kurth S, Cengiz K, Möller D, Wein L, Seume JR. Systematic Roughness Variation to Model the Influence of Skewness on Wall Bounded Flows. Journal of the Global Power and Propulsion Society. 2023 Jun 14;7:177-187. doi: 10.33737/jgpps/163089
Kurth, Sebastian ; Cengiz, Kenan ; Möller, Daniel et al. / Systematic Roughness Variation to Model the Influence of Skewness on Wall Bounded Flows. In: Journal of the Global Power and Propulsion Society. 2023 ; Vol. 7. pp. 177-187.
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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.",
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