Passive noise control strategies for jets exhausting over flat surfaces: an LES study

Colby Horner, Adrian Sescu, Mohammed Afsar, Eric Collins, Mahdi Azarpeyvand

Research output: Contribution to conferencePaperpeer-review

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Abstract

Unconventional aircraft propulsion configurations have to be considered in the future to address environmental issues, including air traffic noise that is know to affect communities surrounding airports. One approach involves rectangular jets in the vicinity of flat surfaces that are parallel to the jet axis in an attempt to shield the noise, but previous experimental work indicated that there is an increase in the noise generated by these configurations, mainly associated with the effect that the plate trailing edge exerts on the flow. In this work, we use large eddy simulations to investigate the potential of wall deformations at the plate trailing edge to reduce jet noise. We consider a high aspect ratio rectangular nozzle exhausting a jet over a flat surface in different configurations, and estimate the farfield noise using the Ffowcs Williams and Hawkins acoustic analogy. Because of the high aspect ratio of the rectangular nozzle, we approximate the jet as being two-dimensional, and use periodic boundary conditions in the spanwise direction. For the configurations that we considered here, the trailing edge deformations did not seem to affect the noise significantly; an overall sound pressure level in the order of 1-2 dB was observed for some selected cases.

Original languageEnglish
Number of pages11
DOIs
Publication statusPublished - 15 Jun 2020
Event2020 AIAA Aviation and Aeronautics Forum and Exposition: 2020 AIAA AVIATION Forum - Virtual Event
Duration: 15 Jun 202019 Jun 2020
https://www.aiaa.org/aviation

Conference

Conference2020 AIAA Aviation and Aeronautics Forum and Exposition
Abbreviated titleAIAA 2020
Period15/06/2019/06/20
Internet address

Keywords

  • large-Eddy simulations
  • trailing-edge noise
  • passive control

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