Flight Test of a Paint-Riblet for Reducing Skin-Friction

Kurita, Minoru; Nishizawa, Azusa; Kwak, Dong-Youn; Iijima, Hidetoshi; Iijima, Yoshimi; Takahashi, Hidemi; Sasamori, Monami; Abe, Hiroyuki; Koga, Shunsaku; Nakakita, Kazuyuki

doi:10.2514/6.2018-3005

Cited by 10 publications

(8 citation statements)

References 6 publications

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“…More recently, the Japan Aerospace Exploration Agency (JAXA) developed a paint that could recreate these patterns without the additional complexity of manufacturing special panels. They performed wind tunnel testing supported by flight tests on a full-scale aircraft to support the use of such a method for drag reduction in aircraft ( Kurita et al, 2018 ). Although this progress is exciting, there is still much work required to bring such a unique approach to large-scale operations.…”

Section: Ribletsmentioning

confidence: 99%

Lessons from natural flight for aviation: then, now and tomorrow

Harvey

Croon

Taylor

et al. 2023

Journal of Experimental Biology

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Powered flight was once a capability limited only to animals, but by identifying useful attributes of animal flight and building on these with technological advances, engineers have pushed the frontiers of flight beyond our predecessors’ wildest imaginations. Yet, there remain many key characteristics of biological flight that elude current aircraft design, motivating a careful re-analysis of what we have learned from animals already, and how this has been revealed experimentally, as well as a specific focus on identifying what remains unknown. Here, we review the literature to identify key contributions that began in biology and have since been translated into aeronautical devices or capabilities. We identify central areas for future research and highlight the importance of maintaining an open line of two-way communication between biologists and engineers. Such interdisciplinary, bio-informed analyses continue to push forward the frontiers of aeronautics and experimental biology alike.

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Section: Ribletsmentioning

confidence: 99%

Lessons from natural flight for aviation: then, now and tomorrow

Harvey

Croon

Taylor

et al. 2023

Journal of Experimental Biology

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“…This calculation is based on 3% drag reduction by riblets, which reduces fuel consumption and consequently decreases the amount of carried fuel and allows replacing this load with extra commercial payloads. This is a good indication of riblets' performance Over the past few decades, several research activities have focused on commercial aircraft [6,66,[103][104][105]. These studies have explored the effectiveness of riblet geometries through various approaches.…”

Section: Flight Tests and In-service Applications Of Ribletsmentioning

confidence: 99%

Advances in Riblets Design

Pakatchian,

Rocha,

2023

Applied Sciences

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Continuous evolution in nature has created optimum solutions for creature survival that have inspired many innovative engineering designs. Riblet geometries, passive flow control devices, have been studied, which were inspired by the skin of fast-swimming sharks. Turbulent boundary layer research reveals the positive effect of riblets in reducing drag by manipulating turbulent structures. Reducing drag is an important topic for the aviation industry, as it directly relates to fuel savings and reductions in carbon footprints. Aircraft noise represents another significant area of concern. When riblet designs modify turbulent structures, they can also impact pressure sources within the boundary layer, consequently influencing the generation of self-noise. Earlier research studies have demonstrated the favorable outcomes of riblet configurations on the variations in wall pressure, resulting in reduced levels of noise propagation. The current review paper is mainly devoted to the application of riblets in the aviation industry, focusing on studies that are performed in wind tunnels, flight tests, and using numerical techniques. Proving the desired performance of micro-grooves, their method of fabrication and implementation on aircraft surfaces are important topics that are also discussed. In addition, the effect of durability on the performance and required maintenance intervals was previously investigated and is also presented. Finally, recommendations for future activities in the relevant fields of study are provided.

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“…The riblet shape was a straight groove shape, the width of which is 170 μm. More details of the riblet used in the flight experiment can be found elsewhere [17,22,38] as this study emphasizes the interpolation of the boundary layer profiles measured under flight conditions.…”

Section: Paint-based Ribletsmentioning

confidence: 99%

Interpolation of Turbulent Boundary Layer Profiles Measured in Flight Using Response Surface Methodology

et al. 2018

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Turbulent boundary layer profiles on the aircraft surface were characterized by pitot-rake measurements conducted in flight experiments at high subsonic Mach number ranges. Due to slight variations in atmospheric air conditions or aircraft attitudes, such as angles of attack and absolute flight speeds at different flights even under the same premised flight conditions, the boundary layer profiles measured at different flights can exhibit different shape and velocity values. This concern leads to difficulty in evaluating the efficiency of using some kind of drag-controlling device such as riblets in the flight test, since the evaluation would be conducted by comparing the profiles measured with and without using riblets at different flights. An approach was implemented to interpolate the boundary layer profile for a flight condition of interest based on the response surface method, in order to eliminate the influence of the flight conditional difference. Results showed that the interpolation with the 3rd-degree response surface model with a combination of two independent variables of flight Mach number and total pressure successfully eliminated the influence of the flight conditional difference, and interpolated the boundary layer profiles measured at different flights within an inaccuracy of 4.1% for the flight Mach number range of 0.5 to 0.78.

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Flight Test of a Paint-Riblet for Reducing Skin-Friction

Cited by 10 publications

References 6 publications

Lessons from natural flight for aviation: then, now and tomorrow

Lessons from natural flight for aviation: then, now and tomorrow

Advances in Riblets Design

Interpolation of Turbulent Boundary Layer Profiles Measured in Flight Using Response Surface Methodology

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