Simplified Hybrid Laminar Flow Control for the A320 Fin. Part 2: Evaluation with the e<sup>N</sup>-method

Schrauf, G.; Geyr, H. von

doi:10.2514/6.2021-1305

Cited by 8 publications

(5 citation statements)

References 10 publications

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“…To have a general insight into the common use cases for the application of IR thermography measurements, the reader might have a look at the listed references: (Quast 1987;Dollinger et al 1992;Raffel and Merz 2014;Traphan et al 2015;Bakunowicz and Szewczyk 2015;Joseph et al 2016;Koch et al 2020;Gardner et al 2020;Schrauf and von Geyr 2021).…”

Section: Common Use Cases For Thermographic Measurementmentioning

confidence: 99%

Automatic separation of laminar-turbulent flows on aircraft wings and stabilisers via adaptive attention butterfly network

2022

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Many of the laminar-turbulent flow localisation techniques are strongly dependent upon expert control even-though determining the flow distribution is the prerequisite for analysing the efficiency of wing & stabiliser design in aeronautics. Some recent efforts have dealt with the automatic localisation of laminar-turbulent flow but they are still in infancy and not robust enough in noisy environments. This study investigates whether it is possible to separate flow regions with current deep learning techniques. For this aim, a flow segmentation architecture composed of two consecutive encoder-decoder is proposed, which is called Adaptive Attention Butterfly Network. Contrary to the existing automatic flow localisation techniques in the literature which mostly rely on homogeneous and clean data, the competency of our proposed approach in automatic flow segmentation is examined on the mixture of diverse thermographic observation sets exposed to different levels of noise. Finally, in order to improve the robustness of the proposed architecture, a self-supervised learning strategy is adopted by exploiting 23.468 non-labelled laminar-turbulent flow observations.

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Section: Common Use Cases For Thermographic Measurementmentioning

confidence: 99%

Automatic separation of laminar-turbulent flows on aircraft wings and stabilisers via adaptive attention butterfly network

2022

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“…10) ¶ On the starboard side, the assumed critical -factor is somewhat lower than on the port side to account for larger crossflow amplification. The critical -factors used for design are shown in [19]. In contrast to earlier HLFC flight test from 1998 with a different and much more complex suction system [20,21], we did not install a heater mat for the visualization of the laminar-turbulent transition with infra-red thermography.…”

Section: Flight Test Instrumentation and Installationmentioning

confidence: 99%

Hybrid Laminar Flow Control on A320 Fin: Retrofit Design and Sample Results

Schrauf¹,

Geyr²

2021

Journal of Aircraft

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A flight test with a simplified Hybrid Laminar Flow Control (HLFC) system on the vertical tail plane (VTP) of an A320 aircraft was performed in April/May 2018. This HLFC system was a prototype for a simplified system that might be attractive for drag reduction of commercial long-range aircraft. The paper presents the design principles of a simplified HLFC system, including passive suction, and shows their application to aerodynamic and suction system design for the retrofit of an A320 VTP. Furthermore, sample flight test results will be presented and discussed.

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“…This differs from the pressure distribution considered for earlier HLFC applications, as, for example, in that of the A320 VTP presented in Figure 2b. The design of the HLFC system for the VTP and some flight test results are described in [2,3]. The installed VTP system is shown in Figure 3.…”

Section: Introduction To the Hlfc-win Projectmentioning

confidence: 99%

“…3. Inclusion of no-suction zones caused by the supporting structure in the design calculations.The A320 flight test activities received funding from the European Community's Seventh Framework Programme FP7/2007-2013, under grant agreement no 604013, AFLoNext project.…”

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Some Specific Challenges of HLFC Design on a Long-Range Wing

Schrauf,

Kilian

2023

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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We describe the aerodynamic design of an HLFC system for the wing of a large transport aircraft and compare it to the the HLFC system installed in the VTP of the DLR A320 ATRA aircraft. For the VTP we used the ALTTA-design with a laser-drilled microperforated titanium sheet with only one microperforation and small suction chambers beneath it. For the wing we designed a system with only one large plenum and controlled the suction with the help of variable microperforation. Some specific challenges of an HLFC design on a wing in contrast to a VTP application are highlighted here.

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Simplified Hybrid Laminar Flow Control for the A320 Fin. Part 2: Evaluation with the e^N-method

Cited by 8 publications

References 10 publications

Automatic separation of laminar-turbulent flows on aircraft wings and stabilisers via adaptive attention butterfly network

Automatic separation of laminar-turbulent flows on aircraft wings and stabilisers via adaptive attention butterfly network

Hybrid Laminar Flow Control on A320 Fin: Retrofit Design and Sample Results

Some Specific Challenges of HLFC Design on a Long-Range Wing

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Simplified Hybrid Laminar Flow Control for the A320 Fin. Part 2: Evaluation with the eN-method

Cited by 8 publications

References 10 publications

Automatic separation of laminar-turbulent flows on aircraft wings and stabilisers via adaptive attention butterfly network

Automatic separation of laminar-turbulent flows on aircraft wings and stabilisers via adaptive attention butterfly network

Hybrid Laminar Flow Control on A320 Fin: Retrofit Design and Sample Results

Some Specific Challenges of HLFC Design on a Long-Range Wing

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Product

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Simplified Hybrid Laminar Flow Control for the A320 Fin. Part 2: Evaluation with the e^N-method