Durability of hybrid laminar flow control (HLFC) surfaces

Young, Trevor; Mahony, Brian; Humphreys, Bryan E.; Totland, Ernst J.; McClafferty, Alan; Corish, Julie

doi:10.1016/s1270-9638(03)00013-0

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…Some leading edges of aerodynamic surfaces need de-or anti-icing. It has been shown that leading-edge suction can be made compatible with de-or anti-icing needs [28][29][30][31]. The loss of laminarity due to insect contamination has been investigated (see, for example [32]), and can be estimated using insect density profiles [33,34] for take-off and landing.…”

Section: Remarks On Main Hlfc Challengesmentioning

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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Section: Remarks On Main Hlfc Challengesmentioning

confidence: 99%

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

Schrauf¹,

Geyr²

2021

Journal of Aircraft

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“…The tests commenced in August 1999, with the aircraft flying standard passenger service routes in Northern Europe, for a period of 20 months, the objective being to investigate contamination and durability aspects of HLFC. The test vehicle, methodology and selected results are described in references [35] and [36].…”

Section: Saab 2000mentioning

confidence: 99%

Liquid anti-contamination systems for hybrid laminar flow control aircraft—a review of the critical issues and important experimental results

Young

Humphreys²

2004

Proceedings of the Institution of Mechanical Engineers, Part G:

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Contamination of the aircraft leading edges by insects and other airborne particles is a major operational concern for the implementation of hybrid laminar flow control (HLFC)-an active drag reduction technique, which has the potential to produce significant fuel savings for airliners. A review of the critical issues is provided, encompassing the transition mechanism, insect distributions and concepts for contamination mitigation. The use of liquid/foam-based systems has proved to be very successful, as is evident in the review of experimental work.

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“…The same applies to erosion, which mainly affects front-facing areas of the aircraft [20]. Experiments of laser-drilled panels attached to the leading edge of the wing during real flight operation revealed immense differences in the extent of wear for titanium, aluminium and carbon fibre, with titanium showing best durability [21].…”

Section: Introductionmentioning

confidence: 99%

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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Durability of hybrid laminar flow control (HLFC) surfaces

Cited by 10 publications

References 2 publications

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

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

Liquid anti-contamination systems for hybrid laminar flow control aircraft—a review of the critical issues and important experimental results

Aircraft Wing Design for Extended Hybrid Laminar Flow Control

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