Using highly porous aluminum alloys and honeycomb structures in spacecraft landing gear

Selivanov, V. V.; Silnikov, М.V.; Марков, В. А.; Popov, Yu.V.; Pusev, V. I.

doi:10.1016/j.actaastro.2020.12.014

Cited by 22 publications

(6 citation statements)

References 20 publications

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“…From an engineering perspective, the integration of porous structures into two-dimensional (2-D) bluff bodies has emerged as a notable passive flow control technique that promotes drag reduction (Klausmann & Ruck 2017;Geyer 2020), suppresses noise (Sato & Hattori 2021) and mitigates vortex-induced vibrations (Yuan et al 2021). Such aerodynamic benefits are crucial in the design of aircraft landing gear (Merino-Martínez, Kennedy & Bennett 2021;Selivanov et al 2021), high-speed train pantographs (Sueki, Ikeda & Takaishi 2009), offshore pipeline systems (Wen et al 2012) and the structural frameworks of unmanned aerial vehicles (Klippstein et al 2018). In these applications, porous materials are used either to coat the bodies or to construct them entirely from patterned obstructions, significantly altering the downstream wake dynamics.…”

Section: Introductionmentioning

confidence: 99%

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The effect of permeability on the flow structure of porous square cylinders

Seol,

Kim,

Kim

2024

J. Fluid Mech.

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This study experimentally investigates the wake structure of a porous square cylinder in terms of permeability over two decades of $Da$ (i.e. $2.4 \times 10^{-5} < Da < 2.9 \times 10^{-3}$ ). The porous cylinder, featuring a simple cubic lattice structure, was fabricated using an additive manufacturing technique. This unique method, combined with a periodic and scalable lattice structure, effectively isolates permeability from porosity, making it suitable for an in-depth parametric study. The key parameter, permeability, was directly estimated by measuring the pressure drop and superficial velocity for each porous case in an open-loop pipe flow system. The downstream flow fields were obtained using standard planar particle image velocimetry measurements in an open-loop wind tunnel. Based on the experimental data, structural modifications in the near wake were examined in relation to permeability, leading to the identification of four distinct flow regimes depending on $Da$ . Additionally, the downstream flow adjustment length ( $L_i$ ) was assessed by introducing a permeability-based source term into the momentum equation, facilitating the development of an analytical model for $L_i$ . The present experimental data support this analytical model, and our results further confirmed that $L_i$ plays a crucial role as a characteristic length scale in the near wake.

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Section: Introductionmentioning

confidence: 99%

“…Such aerodynamic benefits are crucial in the design of aircraft landing gear (Merino-Martínez, Kennedy & Bennett 2021; Selivanov et al. 2021), high-speed train pantographs (Sueki, Ikeda & Takaishi 2009), offshore pipeline systems (Wen et al. 2012) and the structural frameworks of unmanned aerial vehicles (Klippstein et al.…”

Section: Introductionmentioning

confidence: 99%

The effect of permeability on the flow structure of porous square cylinders

Seol,

Kim,

Kim

2024

J. Fluid Mech.

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“…With the urgent demand for a lightweight design and low cost for the equipment and components in many fields, such as aerospace and automotive industries, the porous Al wick is increasingly attracting widespread attention. It not only combines the advantages of the high thermal conductivity of Cu and a low density of carbon fiber, but also has lower costs and better corrosion resistance [15,16].…”

Section: Introductionmentioning

confidence: 99%

Effect of Copper Content on the Microstructure and Properties of the Sintered Porous Aluminum Wick

Cai,

Duan

2024

Metals

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Porous aluminum has been widely used as a wick, an electrode, and in other products, due to its advantages of a light weight, pore uniformity, and corrosion resistance. However, the dense alumina layer on the surface of Al powder hinders its densification during sintering. In this paper, porous aluminum was prepared via loose powder sintering with the addition of Cu as a sintering aid. The effects of Cu content on the microstructure and wick properties of the porous aluminum were investigated. The results showed that, with increasing Cu content, the porosity and capillary properties of porous Al decreased, while the compressive strength improved. The optimal Cu content was determined to be 3 wt.% and the prepared porous Al has a porosity of 47.5%, plateau stress of 11.82 MPa, and capillary characteristic parameter of 6.72 × 10−8 N, meeting the requirements for wicks in heat pipes. These findings contribute to the demand for the lightweight design of heat pipes for aerospace applications.

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“…One of the most interesting structures inspired by nature is the honeycomb pattern which can be described as interconnected and repeating units of spherical, hexagonal, or polyhedral cells [2]. Its unique properties and structure inspired the construction of light and robust aircraft and spacecraft [3], protection gear [4], panels, packaging, and cushioning [5] because of an ability to absorb impact and energy. The repeating units of a honeycomb pattern can also effectively trap particles and impurities thus making them a promising structure for air and water filters [6].…”

Section: Introductionmentioning

confidence: 99%

Honeycomb pattern formation on poly(vinyl chloride) films: electrically-driven microparticle trapping and the effect of drying temperature

Budlayan,

Patricio,

Yap

et al. 2023

Mater. Res. Express

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This work presents the effect of drying temperature on the formation of poly(vinyl chloride) (PVC) honeycomb microstructures formed by the breath figure technique. Results revealed the self-assembly of honeycomb patterns with small cell diameter and thick cell walls dried at room temperature. An increase in cell diameter and a decrease in wall thickness were observed as drying temperature was increased up to 70 ◦C while no formation of patterns was noted at temperatures greater than or equal to 80 ◦C. The presence of honeycomb patterns consequently enhanced the static water contact angle of the PVC layer. Electrowetting experiments revealed more pronounced reduction in the water contact angle on honeycomb-structured PVC compared to a flat PVC layer at any given applied voltage. A proof-of-concept on the feasibility of the honeycomb structures to trap microparticles by electrically-driven droplet actuationwas further demonstrated. Corresponding SEM images confirmed the entrapment of microparticles in the honeycomb cells and walls after the electrowetting experiment. These results offer new and facile strategies for tuning the morphological properties of polymeric honeycomb microstructures and its possible application in microparticle trapping and sensing.

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Using highly porous aluminum alloys and honeycomb structures in spacecraft landing gear

Cited by 22 publications

References 20 publications

The effect of permeability on the flow structure of porous square cylinders

The effect of permeability on the flow structure of porous square cylinders

Effect of Copper Content on the Microstructure and Properties of the Sintered Porous Aluminum Wick

Honeycomb pattern formation on poly(vinyl chloride) films: electrically-driven microparticle trapping and the effect of drying temperature

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