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Open AccessArticle

Structured Porous Material Design for Passive Flow and Noise Control of Cylinders in Uniform Flow

1
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, China
2
Key Laboratory of Aerodynamic Noise Control, China Aerodynamics Research and Development Center, Mianyang 621000, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(18), 2905; https://doi.org/10.3390/ma12182905
Received: 21 July 2019 / Revised: 22 August 2019 / Accepted: 4 September 2019 / Published: 9 September 2019
(This article belongs to the Section Porous Materials)
Cylindrical bodies in uniform flows can be coated with a porous medium as a passive flow and noise control method in an effort to reduce the acoustic effects of vortex shedding. To date, the employed open-cell porous materials typically possess a randomized internal structure. This paper presents the design and validation of a novel 3-D printed structured porous coated cylinder that has significant flexibility, in that the porosity and pores per inch of the porous coating can be modified independently and relatively easily. The performance of the structured porous coating design is compared against porous polyurethane and metal foam with the same coating dimensions and similar pores per inch and porosity via an experimental acoustic investigation, revealing strong similarity in the passive noise control performance of each material type. A numerical comparison illustrates the similarities of the wake structure of the 3-D printed porous coated cylinder to an equivalent Darcy–Forchheimer model simulation that represents a randomized internal porous structure. The performance similarities of these different porous material types indicate that a structured porous geometry can be used to understand the internal flow behavior of the porous medium responsible for reducing the cylinder vortex shedding tone that is otherwise extremely difficult or impossible with typical randomized porous structures. Moreover, significant potential exists for the porous structure to be further optimized or smartly tailored by architectural design for different control purposes, coating geometries and dimensions, and working conditions. View Full-Text
Keywords: porous material; aeroacoustics; passive noise control porous material; aeroacoustics; passive noise control
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MDPI and ACS Style

Arcondoulis, E.J.G.; Liu, Y.; Li, Z.; Yang, Y.; Wang, Y. Structured Porous Material Design for Passive Flow and Noise Control of Cylinders in Uniform Flow. Materials 2019, 12, 2905.

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