Numerical analysis of the instabilities behind a blunt slat trailing-edge

Laura Botero Bolivar, Daniel Acevedo Giraldo, Lourenço Lima Pereira, Fernando Martini Catalano, Danillo C. Reis, Eduardo L. C. Coelho

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Concerns about the noise generated by the structure of aircraft have significantly
increased over the past years due to reductions in the engine noise and tighter
regulations established by certifying entities. Slat is one of the most important
sources of airframe noise, since it generates a noise spectrum composed of midfrequency tones, a broadband component, and a high-frequency hump. This article addresses a detailed analysis of the high-frequency tone generation and its relation to the slat trailing-edge thickness. Numerical simulations of a typical three-element airfoil were conducted by PowerFLOW 5.3 software at 1 million Reynolds number and the noise was propagated according to the Ffowcs William-Hawking methodology. The high spatial and temporal resolution in the simulations aimed to capture variations in the slat trailing-edge thickness. The results showed the presence of a strong vortex shedding behind the slat, which is highly related to the high-frequency tone and the blunt slat trailing-edge. The frequency of the tone in the far-field spectrum is in agreement with that in the vortex shedding. The Strouhal number calculated with the use of the boundary layer displacement thickness as the characteristic length was constant for all cases and close to 0.4.
Original languageEnglish
Title of host publicationInternoise: noise control for a better environment
Publication statusPublished - 2019
Externally publishedYes
Event48th International Congress and Exhibition on Noise Control Engineering, INTERNOISE 2019 - Madrid, Spain
Duration: 16 Jun 201919 Jun 2019
Conference number: 48


Conference48th International Congress and Exhibition on Noise Control Engineering, INTERNOISE 2019
Abbreviated titleINTERNOISE 2019


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