Aeroacoustic and aerodynamic study of trailing-edge serrated airfoils in tandem configuration

Xiao Liu, Syamir Alihan Showkat Ali, Mahdi Azarpeyvand, Yannick Mayer

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

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This paper presents a comprehensive experimental study on the application of trailing-edge serrations as a passive control method for reducing the aerodynamic loading on airfoils in several tandem configurations. The purpose of this study is to investigate the effectiveness of serrated trailing-edge on NACA65-710 tandem airfoil to control and regularize the turbulent flow within the gap area between the two airfoils. The wake flow characteristics for an isolated NACA65-710 airfoil with and without the trailing-edge serration treatment have been carried out using two-dimensional Particle Image Velocimetry(PIV) method. The aeroacoustic performance of the tandem airfoil configuration is also studied using in-site pressure transducers instrumented over the airfoil surface, as well as far-field microphones. To reveal the effects of trailing-edge serration on the tandem configuration, flow experiments were performed using a slotted-sawtooth serration, for several tandem configurations, with different airfoil gap distances. The results show that the use of serrations can generally lead to a significant reduction in the turbulent kinetic energy within the gap, due to the interaction between the flows issued from the tip and root of the serration. The far-field noise results have shown that a significant noise reduction can be achieved with the use of the serrations.
Original languageEnglish
Title of host publicationProceedings of the 23rd International Congress on Acoustics, integrating 4th EAA Euroregio 2019
PublisherDEGA e.V.
Number of pages8
Publication statusPublished - 12 Sep 2019


  • passive flow control
  • serration
  • tandem airfoil

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