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Franco, Juan and Theiß, Alexander and Hein, Stefan (2021) Influence of surface irregularities on the expected boundary-layer transition location on hybrid laminar flow control wings. In: 22nd STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics XIII, 151, pp. 174-184. Springer Nature. 22. STAB/DGLR Symposium 2020, 2020-07-15, Göttingen, Deutschland. doi: 10.1007/978-3-030-79561-0_17. ISBN 978-3-030-79560-3. ISSN 1612-2909.
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Official URL: https://link.springer.com/book/10.1007/978-3-030-79561-0#editorsandaffiliations
Abstract
Hybrid laminar flow control (HLFC) is a promising concept to reduce the viscous drag on aircraft wings by shifting the expected laminar-turbulent transition (LTT) location downstream. However, the structural joint between the leading edge suction panel and the wing box can diminish this desirable shift in LTT location and thus reduce the efficiency of the HLFC system. This paper introduces a toolchain, which allows to numerically quantify the detrimental effects of two-dimensional surface irregularities for transonic HLFC swept wings at free-flight Reynolds numbers. A backward-facing step and two different gaps are studied, which resemble possible structural joint geometries currently considered within the HLFC-WIN project. The stability analysis performed with the Adaptive Harmonic Linearized Navier-Stokes (AHLNS) approach reveals that none of the three irregularities affects the expected LTT location, suggesting that there might be some potential to relax the surface tolerances initially specified in the HLFC-WIN project using classical criteria.
| Item URL in elib: | https://elib.dlr.de/139891/ | ||||||||||||||||||||
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| Document Type: | Conference or Workshop Item (Other) | ||||||||||||||||||||
| Additional Information: | Hardcover ISBN 978-3-030-79560-3 Softcover ISBN 978-3-030-79563-4 eBook ISBN 978-3-030-79561-0 Series ISSN 1612-2909 Series E-ISSN 1860-0824 | ||||||||||||||||||||
| Title: | Influence of surface irregularities on the expected boundary-layer transition location on hybrid laminar flow control wings | ||||||||||||||||||||
| Authors: |
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| Date: | 14 July 2021 | ||||||||||||||||||||
| Journal or Publication Title: | 22nd STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics XIII | ||||||||||||||||||||
| Refereed publication: | Yes | ||||||||||||||||||||
| Open Access: | Yes | ||||||||||||||||||||
| Gold Open Access: | No | ||||||||||||||||||||
| In SCOPUS: | Yes | ||||||||||||||||||||
| In ISI Web of Science: | No | ||||||||||||||||||||
| Volume: | 151 | ||||||||||||||||||||
| DOI: | 10.1007/978-3-030-79561-0_17 | ||||||||||||||||||||
| Page Range: | pp. 174-184 | ||||||||||||||||||||
| Editors: |
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| Publisher: | Springer Nature | ||||||||||||||||||||
| Series Name: | Notes on Numerical Fluid Mechanics and Multidisciplinary Design | ||||||||||||||||||||
| ISSN: | 1612-2909 | ||||||||||||||||||||
| ISBN: | 978-3-030-79560-3 | ||||||||||||||||||||
| Status: | Published | ||||||||||||||||||||
| Keywords: | Surface irregularity, laminar-turbulent transition, AHLNS, PSE, HLFC wing | ||||||||||||||||||||
| Event Title: | 22. STAB/DGLR Symposium 2020 | ||||||||||||||||||||
| Event Location: | Göttingen, Deutschland | ||||||||||||||||||||
| Event Type: | international Conference | ||||||||||||||||||||
| Event Date: | 15 July 2020 | ||||||||||||||||||||
| Organizer: | STAB/DGLR | ||||||||||||||||||||
| HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||||||||||
| HGF - Program: | Aeronautics | ||||||||||||||||||||
| HGF - Program Themes: | fixed-wing aircraft | ||||||||||||||||||||
| DLR - Research area: | Aeronautics | ||||||||||||||||||||
| DLR - Program: | L AR - Aircraft Research | ||||||||||||||||||||
| DLR - Research theme (Project): | L - Simulation and Validation (old) | ||||||||||||||||||||
| Location: | Göttingen | ||||||||||||||||||||
| Institutes and Institutions: | Institute for Aerodynamics and Flow Technology > High Speed Configurations, GO | ||||||||||||||||||||
| Deposited By: | Franco, Juan | ||||||||||||||||||||
| Deposited On: | 22 Dec 2020 10:57 | ||||||||||||||||||||
| Last Modified: | 27 Mar 2025 13:17 |
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