Concept and design of extended hybrid laminar flow control suction panels

Traub, Hendrik; Wolff, Johannes; Jose, Siby; Lobitz, Lennart; Schollerer, Martin; Hühne, Christian

doi:10.21203/rs.3.rs-924184/v1

Cited by 5 publications

(7 citation statements)

References 20 publications

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“…The main functions of the panel are: (1) continuous suction in order to stabilize the disturbed boundary layer, ( 2) maintaining the airfoil's shape under structural and aerodynamic loads and (3) supporting the wing skin against stability failure. Figure 10 shows the cross section of a xHLFC suction panel as defined by Traub et al [29].…”

Section: Compliant Structuresmentioning

confidence: 99%

Vehicle Technologies towards Sustainable and Energy Efficient Aviation

Friedrichs

Elham

Hühne

et al. 2022

AIAA SCITECH 2022 Forum

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The overall mission is research and fundamental technological development for a sustainable future global air transport system. Following the vision of zero fossil fuel usage in aviation in a 2050 timeframe, reducing material and noise emissions while keeping air transport affordable on short to long range missions, SE²A focuses on significantly reducing the aircraft energy demand in combination with future energy storage and conversion technologies. This large design space makes preliminary system design and assessment based on models of different fidelity level indispensable. In this paper, the framework and research structure of the Cluster is described as well as a special focus on relevant and required vehicle technologies. This follows the need for a significant reduction of the mission energy to allow for future alternative propulsion systems and covers means for radical reductions in aircraft drag and dynamic loads, which in turn allow for reduced operating empty weight. An overall aircraft design methodology is employed for integration and assessment of technological progress. Such analysis is used to identify and quantify snowball effects and to prioritize technologies, but also to identify conflicting areas and requirements.

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Section: Compliant Structuresmentioning

confidence: 99%

Vehicle Technologies towards Sustainable and Energy Efficient Aviation

Friedrichs

Elham

Hühne

et al. 2022

AIAA SCITECH 2022 Forum

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“…The Cluster of Excellence for Sustainable and Energy-Efficient Aviation (SE 2 A) (https: //www.tu-braunschweig.de/se2a, accessed on 18 September 2023) is developing an extended HLFC suction panel (xHLFC), where in contrast to common HLFC concepts, the arrangement of LFC at the leading edge and NLF at the rear part of the wing is inversed [5]. Applying suction on the rear part of the wing, the concept aims at maintaining laminar flow up to 80% of the chord length on the wing upper cover.…”

Section: Introductionmentioning

confidence: 99%

“…A conceptual illustration of the xHLFC concept in comparison to NLF, LFC and HLFC is shown in Figure 1 [5]. Similar to existing HLFC concepts such as ALTTA [6], ECHO [7,8] and TSSD [9], the xHLFC-suction panel consists of three functional components as shown in Figure 2 [5]. The outer component is a thin, micro-perforated suction skin.…”

Section: Introductionmentioning

confidence: 99%

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Aircraft Wing Design for Extended Hybrid Laminar Flow Control

Lobitz,

Traub,

Overbeck

et al. 2023

Aerospace

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Laminar flow offers significant potential for increasing the energy-efficiency of future transport aircraft. The German Cluster of Excellence SE2A is developing a new approach for hybrid laminar flow control. The concept aims to maintain laminar flow up to 80% of the chord length by integrating suction panels at the rear part of the wing, which consist of a thin suction skin and a supporting core structure. This study examines effects of various suction panel configurations on wing mass and load transfer for an all-electric short-range aircraft. Suction panel material, as well as thickness and relative density of the suction panel core are modified in meaningful boundaries. Suction panels made from Ti6Al4V offer the most robust design resulting in a significant increase in wing mass. For the studied configurations, they represent up to 33.8% of the mass of the wingbox. In contrast, panels made from Nylon11CF or PU1000 do not significantly increase the wing mass. However, the use of these materials raises questions about their robustness under operational conditions. The results demonstrate that the choice of material strongly influences the load path within the wing structure. Ti6Al4V suction panels provide sufficient mechanical properties to significantly contribute to load transfer and buckling stiffness. Locally, the share of load transfer attributed to the suction panel exceeds 50%. In contrast, compliant materials such as Nylon11CF or PU1000 are inherently decoupled from load transfer. Unlike the thickness of the suction skin, the relative density of the core structure strongly affects the wrinkling stiffness. However, wrinkling failure did not appear critical for the examined suction panel configurations. In the present study, the mechanical properties of Ti6Al4V cannot fully be exploited. Therefore, compliant suction panels made from Nylon11CF are preferred in order to achieve a lightweight solution, provided that they meet operational requirements.

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“…Microgeometrically, researchers altered the wing with suction holes to better control laminar flow, resulting in a 20% reduction in the total drag. In addition, with technological advancement, electronic and micro laser beams were available to drill suction holes in the 1990s, helping the plane to control laminar flow [4]. In other studies, researchers focused on minimizing surface imperfections, which impact the local adverse pressure gradient, by optimizing the shape of rivets and the material of fuselage skin [5].…”

Section: Introductionmentioning

confidence: 99%

Principles and examples of drag reduction in civil airliners

He,

Lu,

Sun

2023

ACE

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Civil aviation has grown rapidly over the past hundred years as demand from air travellers has increased. Since the mid to late 20th century, there have been recurring global energy crises due to political and economic upheavals. In this international context, airlines have tended to operate less draggy, more fuel efficient aircraft in order to maximise profits through fuel cost savings . To this end, aircraft manufacturers have historically tried a variety of methods to address the issue of drag reduction.This paper highlights the importance of three drag reduction methods utilized on modern subsonic airliners by introducing their basic principle and evaluating their effectiveness based on previous research and typical experiments. This paper summarizes and analyzes different approaches to reduce drag in civil aviation. It first investigates the principle behind frictional, induced, and profile drag in theoretical aspects. It then discusses in detail the biomimicry microstructure based on shark skin and its uniqueness on aircraft fuselages surface to reduce frictional drag, the split scimitar winglet and its ideal performance to reduce induced drag when compared with other wingtip devices with different cant angles. The newly introduced adaptive lifting surface changes the wings geometric configuration momentarily, and its ability to reduce profile drag at different stages of flight. This paper also comprehensively compares both the benefits and potential compromises of these drag reduction methods.

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Concept and design of extended hybrid laminar flow control suction panels

Cited by 5 publications

References 20 publications

Vehicle Technologies towards Sustainable and Energy Efficient Aviation

Vehicle Technologies towards Sustainable and Energy Efficient Aviation

Aircraft Wing Design for Extended Hybrid Laminar Flow Control

Principles and examples of drag reduction in civil airliners

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