Flow induced noise reduction design of airfoils with spanwise riblet surface

Zhigao Dang, Zhaoyong Mao

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Airfoils are typical structures applied in many practical engineering applications, such as wind turbines, the wings of airplane, and marine propellers. However, unnecessary noise would be generated when these devices are in operation, which is deleterious both to people nearby and the surrounding environment. In recent decades, several methods are proposed to reduce the flow induced noise, including serrated trailing edge, wavy leading edge, perforation treatment, etc. Though these methods are feasible to some extent, they are still in the stage of academic investigation. To narrow the gap between scientific research and practical engineering, the biomimetic surface, which imitates the surface morphology of living beings in nature, was introduced to airfoils to reduce drag. As an in-depth study, the noise characteristics of the airfoils with spanwise riblet surface are investigated in this paper based on large eddy simulations and acoustic analogy method. The results showed that both flow field and noise field could be improved through rational design. Reasons for noise reduction are the generation of vortices generated in the riblet structures, which is beneficial to the flow field near airfoils and the wake flow. Due to the advantage of concise structures, it is promising to design low-noise airfoils.

Original languageEnglish
Title of host publicationProceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020
EditorsJin Yong Jeon
PublisherKorean Society of Noise and Vibration Engineering
ISBN (Electronic)9788994021362
StatePublished - 23 Aug 2020
Event49th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2020 - Seoul, Korea, Republic of
Duration: 23 Aug 202026 Aug 2020

Publication series

NameProceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020

Conference

Conference49th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2020
Country/TerritoryKorea, Republic of
CitySeoul
Period23/08/2026/08/20

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