A low risk reentry: looking backward to step forward

Monti, R.; Paterna, D.

doi:10.1016/j.ast.2005.10.006

Cited by 20 publications

(6 citation statements)

References 15 publications

(19 reference statements)

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“…Recently an alternative way to re-enter Earth atmosphere, improving safety and lowering maintenance costs, has been proposed based on slender vehicles with sharp edges, flying at moderate angles of attack. Sharp leading edges would also imply lower aerodynamic drag, improved flight performances and crew safety, due to the larger cross range and maneuverability along with more gentle re-entry trajectories [1][2][3][4]. The temperature at the tip of the leading edge is inversely proportional to the square root of the leading edge nose radius and the reduced curvature radius results in higher surface temperature than that of the actual blunt vehicles that could not be withstood by the conventional thermal protection system materials.…”

Section: Introductionmentioning

confidence: 99%

Arc-Jet Testing of Ultra-High-Temperature-Ceramics

Savino¹,

Fumo²,

Paterna³

et al. 2010

TOAEJ

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The article deals with arc-jet experiments on different Ultra High Temperature Ceramics models in high enthalpy hypersonic non equilibrium flow. Typical geometries for nose tip or wing leading edges of interest for hypersonic vehicles, as rounded wedge, hemisphere and cone are considered. Temperature measurements have been performed using pyrometers, an IR thermocamera and thermocouples. Spectral emissivity has been evaluated by suitable experimental techniques. The details of the experimental set-up, the tests procedure and the measurements are discussed in the text. The UHTC materials have been tested for several minutes to temperatures up to 2050 K showing a good resistance in extreme conditions. Fundamental differences between the various model shapes have been analysed and discussed. Numerical-experimental correlations have been carried out by a CFD code, resulting in good agreement with proper modelling. The numerical rebuilding also allowed to evaluate the catalytic efficiency and the emissivity of the materials at different temperature.

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Section: Introductionmentioning

confidence: 99%

Arc-Jet Testing of Ultra-High-Temperature-Ceramics

Savino¹,

Fumo²,

Paterna³

et al. 2010

TOAEJ

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“…In addition, ZrB 2 ‐based composite materials with various additives such as SiC, MoSi 2 , ZrC, and WC exhibit good ablation resistance, good oxidation resistance, and excellent strength at room and high temperatures . The unique combination of the properties of metallic and ceramic materials makes these additive‐containing ZrB 2 ‐based composite materials candidates for several high‐temperature structural applications . However, these ceramic materials exhibit high intrinsic brittleness and catastrophic fracture behavior.…”

Section: Introductionmentioning

confidence: 99%

“…3,4,13 The unique combination of the properties of metallic and ceramic materials makes these additive-containing ZrB 2 -based composite materials candidates for several high-temperature structural applications. 1,2,[14][15][16] However, these ceramic materials exhibit high intrinsic brittleness and catastrophic fracture behavior. Therefore, to satisfy the strict constraints of such structural applications, ZrB 2 and ZrB 2 -based composites require improved resistance to fracture via extrinsic toughening and/ or microstructural design.…”

Section: Introductionmentioning

confidence: 99%

Reactive Hot‐Pressed Hybrid Ceramic Composites Comprising SiC(SCS‐6)/Ti Composite and ZrB₂–ZrC Ceramic

Guo

2016

J. Am. Ceram. Soc.

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In this study, hybrid composites comprising SiC(SCS‐6)/Ti and ZrB2–ZrC ceramics were prepared by sandwiching Ti/SiC(SCS‐6)/Ti sheets and Zr + B4C powder layers, followed by reactive hot pressing at 1300°C. The microstructure of the obtained hybrid composites was characterized by field‐emission scanning electron microscopy, transmission electron microscopy, and energy‐dispersive X‐ray spectroscopy. The results show that after reactive hot pressing, a highly dense matrix was achieved in the hybrid composites. A Ti‐rich zone was observed only in the hybrid composite prepared using a 10‐μm‐thick Ti foil. Interface reaction occurred during sintering and interface reaction layers were formed between the fibers and the matrix, and the phases were identified. In addition, the mechanical behavior of the hybrid composites was evaluated using by testing under four‐point bend testing. The results indicate that the hybrid composites exhibited greater flexural strengths and noncatastrophic fracture behavior. The flexural strength ranged from 440 to 620 MPa, depending on the thickness of the Ti foils and the fiber volume amount.

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“…Atmospheric reentry guidance and control (G&C) has been [1,2] a significant and ongoing [3][4][5][6] research interest in the aerospace arena connected to several domains of engineering and science. The reentry dynamic exhibits four main complicating features.…”

Section: Introductionmentioning

confidence: 99%

“…The almost unique reentry features have made it a typical case study for engineers, mathematicians, and scientists who want to show the power of their solving theories or techniques. On the other hand, manned atmospheric reentry G&C is a common denominator of human space exploration, space station operations, and space tourism: all "industries of the future, " that are attracting growing investments from countries worldwide [3,6].…”

Section: Introductionmentioning

confidence: 99%

A New Concept for Atmospheric Reentry Optimal Guidance: An Inverse Problem Inspired Approach

Abbasi

Mortazavi²

2013

Mathematical Problems in Engineering

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This paper presents a new concept for atmospheric reentry online optimal guidance and control using a method called MARE G&C that exploits the different time scale featured by reentry dynamics. The new technique reaches a quasi-analytical solution and simplified computations, even considering both lift-to-drag ratio and aerodynamic roll as control variables; in addition, the paper offers a solution for the challenging path constraints issue, getting inspiration from the inverse problem methodology. The final resulting algorithm seems suitable for onboard predictive guidance, a new need for future space missions.

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A low risk reentry: looking backward to step forward

Cited by 20 publications

References 15 publications

Arc-Jet Testing of Ultra-High-Temperature-Ceramics

Arc-Jet Testing of Ultra-High-Temperature-Ceramics

Reactive Hot‐Pressed Hybrid Ceramic Composites Comprising SiC(SCS‐6)/Ti Composite and ZrB₂–ZrC Ceramic

A New Concept for Atmospheric Reentry Optimal Guidance: An Inverse Problem Inspired Approach

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A low risk reentry: looking backward to step forward

Cited by 20 publications

References 15 publications

Arc-Jet Testing of Ultra-High-Temperature-Ceramics

Arc-Jet Testing of Ultra-High-Temperature-Ceramics

Reactive Hot‐Pressed Hybrid Ceramic Composites Comprising SiC(SCS‐6)/Ti Composite and ZrB2–ZrC Ceramic

A New Concept for Atmospheric Reentry Optimal Guidance: An Inverse Problem Inspired Approach

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Product

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About

Reactive Hot‐Pressed Hybrid Ceramic Composites Comprising SiC(SCS‐6)/Ti Composite and ZrB₂–ZrC Ceramic