H2020Индивидуална стипендия2020–2022

ANACLETO · Noise and drag reduction by riblets.

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2020-07-01 → 2022-06-30
Финансиране от ЕС: 175 572 €
Участници: 1
Схема: MSCA-IF

Линиите свързват координатора с партньорите.

Накратко на български

Специални повърхностни релефи (риблети и финлети) върху задния ръб на крилата на самолети и вятърни турбини се тестват за намаляване на шума и съпротивлението. Това помага за ограничаване на шумовото замърсяване около летищата и улеснява разполагането на вятърни електроцентрали.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Noise and drag reduction by riblets.

The project aims at mitigating the noise produced by an airfoil by applying surface treatments at the trailing-edge, therefore through a passive technique of flow control. These surface treatments are protrusions oriented along the flow, and they are respectively called 'finlets' and 'riblets' depending on whether they are of the order of magnitude of the outer scales or of the viscous scales of the turbulent boundary layer. Finlets as well as riblets can be of different sizes and shapes. In recent research it was found that finlets are capable of mitigating the noise emitted, but they also produce a drag increase of the airfoil. Several research articles showed that riblets can lead to a drag decrease, even though their effects have never been examined in relation to noise. The goal of the present project is to assess the effects of finlets and riblets of different sizes and geometries in terms of drag and noise emission. The problem that is addressed is of great societal relevance, as trailing-edge noise is among the most significant contributors to the total acoustic emission of a landing aircraft, and it is the main source of noise from a wind turbine. Therefore, two fast-growing sectors that are strategic for the European Union would directly benefit from this research, which are air transportation and clean energy. - The air traffic has known a massive development over the last decades, and this trend is expected to continue. The acoustic emission from air vehicles represents a strong limiting factor to their further expansion, as noise has been reported to cause health damages to civilians living nearby airports, particularly in relation with prolonged discomfort, stress, and insomnia. - An important limitation to the on-shore installations of wind turbines is their acoustic emission. On this respect, the regulations on the noise pollution from the on-shore wind farms are becoming growingly more stringent. Mitigating the trailing-edge noise, and, thus, reducing the whole acoustic emission of each wind turbine is expected to enlarge the surface available for their installation and to increase their installation density. The ultimate objective of this project is to gain noise reduction without paying any drag increase penalty.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

The aeroacoustic emission generated by the interaction between the trailing-edge of an airfoil and the layer of fluid near the airfoil surface (boundary layer) is known as trailing-edge noise. Trailing-edge noise is among the dominant sources of noise pollution from a landing aircraft and the most significant contributor of the aeroacoustic emissions of a wind turbine. Strategies for the abatement of this source of noise were developed over the last few years, but they deteriorate the aerodynamic performance (lift over drag ratio), which hinders their implementation in engineering solutions. Riblets on the other hand have never been explored in aeroacoustics, although they lead to a drag reduction of up to 10% when applied on a flat plate. Riblets are tiny surface protrusions aligned along the flow direction. A texture analogous to riblets is found in the wing feathers of the owl, the most silent bird in the animal kingdom when flying. To investigate how riblets of different geometries impact on the aeroacoustic and aerodynamic properties of an airfoil, this project pairs a researcher with experience in experimental fluid mechanics and turbulence research with an expert in aeroacoustics and numerical methods, achieving a mutually beneficial transfer of knowledge. The Fellow will examine the effects on noise and drag reduction of a complete set of independent geometrical parameters for the riblets. This will be followed by a detailed study of the flow physics using a complementary approach involving time-resolved tomographic particle image velocimetry at high spatial resolution and high-fidelity numerical simulations with the software PowerFLOW™. The project dissemination will target scientific communities where immediate impact is envisaged, comprising aeroacoustics, aerospace and energy engineering, and turbulence. This pairing and build of project will ensure the successful completion of this ambitious research project and promote the Fellow’s career development.

Оригинален текст от CORDIS (на английски).

Участници

TECHNISCHE UNIVERSITEIT DELFT · DelftКоординаторНидерландия