Numerical study of wind-tunnel acoustic resonance induced by two-dimensional airfoil flow at low reynolds number

Tomoaki Ikeda, Takashi Atobe, Yasufumi Konishi, Hiroki Nagai, Keisuke Asai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

In the aeroacoustic measurements of a windtunnel test, the acoustic resonance should be avoided, associated with the walled test section. The present numerical study of an NACA0012 airfoil focuses on how the wall resonance affects unsteady flow motions via a feedback process, by comparing with the airfoil placed in a free stream. Tonal frequencies observed in the present simulations agree well with our previous wind-tunnel experiments, represented approximately by the discrete resonant modes derived through a simple geometrical relation. More importantly, however, the present results indicate that rather strong wall resonance may alter the hydrodynamic flow measurements as well. The acoustic feedback process stimulates the transitional boundary layer on the suction side, which would increase lift force in the acoustically resonant channel by suppressing trailing-edge separation. At a higher angle of attack, the increment of lift force becomes more significant due to the noticeable size reduction of a separation bubble, understood via the comparison of three-dimensional instantaneous vortical structures.

Original languageEnglish
Title of host publication29th Congress of the International Council of the Aeronautical Sciences, ICAS 2014
PublisherInternational Council of the Aeronautical Sciences
ISBN (Electronic)3932182804
Publication statusPublished - 2014 Jan 1
Event29th Congress of the International Council of the Aeronautical Sciences, ICAS 2014 - St. Petersburg, Russian Federation
Duration: 2014 Sep 72014 Sep 12

Publication series

Name29th Congress of the International Council of the Aeronautical Sciences, ICAS 2014

Other

Other29th Congress of the International Council of the Aeronautical Sciences, ICAS 2014
CountryRussian Federation
CitySt. Petersburg
Period14/9/714/9/12

Keywords

  • Aeroacoustics
  • Aerodynamic characteristics
  • Low reynolds number flow

ASJC Scopus subject areas

  • Aerospace Engineering
  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Materials Science(all)

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  • Cite this

    Ikeda, T., Atobe, T., Konishi, Y., Nagai, H., & Asai, K. (2014). Numerical study of wind-tunnel acoustic resonance induced by two-dimensional airfoil flow at low reynolds number. In 29th Congress of the International Council of the Aeronautical Sciences, ICAS 2014 (29th Congress of the International Council of the Aeronautical Sciences, ICAS 2014). International Council of the Aeronautical Sciences.