Review: Modelling chemical kinetics and convective heating in giant planet entries

Reynier, Philippe; D’Ammando, G.; Bruno, D.

doi:10.1016/j.paerosci.2017.11.002

Cited by 7 publications

(6 citation statements)

References 53 publications

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“…Further, conclusions are drawn on the CEA computation scheme used to benchmark these results and recommendations made for future development of transport routines. Jupiter entry probe Galileo measured ablative patterns that did not match prior predictions developed with legacy CFD and analytical methods [3,6], see Figure (2.2).…”

Section: Thesis Structurementioning

confidence: 86%

“…It was found during investigation of prior art that large number of research into higher order flow phenomena, Refs. [3,6,17] continue to use rudimentary and inaccurate solvers of transport properties. Ref.…”

Section: Thesis Structurementioning

confidence: 99%

“…Ref. [3] reviewed fifteen Gas Giant entry studies of which nine employed the Wilke scheme which under predicts viscosity for typical entry-capsule post shock temperatures. This creates a strong case for investigation of transport routines which underpin the fidelity of studies into complex flow phenomena needed to predict ablation and aeroheating effects.…”

Section: Thesis Structurementioning

confidence: 99%

“…The nose tip of the vehicle will encounter the largest heating effects [1] due to gas stagnation at the point where forces between the gas and vehicle equilibrate. Engineers design the vehicles shape [2], materials [3] and passive cooling techniques [4] to protect the payload from these thermal stresses and to achieve an optimal design that maximises the payload fraction of the vehicle.…”

Section: Introductionmentioning

confidence: 99%

“…These are described transport properties of viscosity, heat conduction and diffusion. Accurate models of these properties are indisputably vital to the modelling of hypersonic aero-heating effects [3,4]. To compute transport properties one would need to describe the microscopic interactions of particles at the macroscopic non-equilibrium boundaries.…”

Section: Introductionmentioning

confidence: 99%

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Segrovets¹

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Implementation of approximate solution methods for the computation of transport properties in Gas Giant compositions was performed for the Eilmer methods library. Yos-Gupta binary mixing rules for viscosity and thermal conductivity as well as modified-Eucken frozen mixture thermal conductivity were validated against multi-component transport solutions from literature. Further, the models were applied to moderately and heavily ionised Saturn entry states. Yos-Gupta provided satisfactory predictions of mixture viscosity up to 10,000K at 1 atm pressure. Modified Eucken showed agreement within 5% up to 10,000K and within 12% up to 15,000K, this outperformed the Yos-Gupta approximation for the same gas state. When applied to Saturn entry conditions it was concluded that the models were able to evaluate effects associated with reaction of gases in the stagnation region and gave sufficient approximation of the moderately ionised entry state. The methods tested could not be recommended for highly ionised gas states as solutions were found to diverge. Lastly, a correction factor of π/10 was determined for implementation of DPLR collision integral fitting equations, and was validated against another collision integral library.

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Section: Thesis Structurementioning

confidence: 86%

Section: Thesis Structurementioning

confidence: 99%

Section: Thesis Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Segrovets¹

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Reflected shock waves in air components and their mixtures: Validation of theoretical models

Kravchenko,

Kunova,

Kustova

et al. 2024

Acta Astronautica

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Computational fluid radiative dynamics of the Galileo Jupiter entry

2019

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On December 7th, 1995, the Galileo descent probe entered Jupiter’s atmosphere at a relative velocity of 47.4 km s−1. Flight data revealed an unforeseen recession profile: while the stagnation region had been significantly oversized, the shoulder almost completely ablated. In an attempt to understand why numerical predictions diverge from the flight data, several sensitivity studies were performed at the 180 km altitude point. The inaccuracy of the Wilke/Blottner/Eucken model at temperatures above 5000 K was confirmed. When applied to Galileo’s entry, it predicts a narrower shock with higher peak temperatures compared to the Gupta/Yos model. The effects of He and H2 line-by-line radiation were studied. Inclusion of these systems increased radiative heating by 9% at the stagnation point, even when precursor heating is unaccounted for. Otherwise, the internal excitation of H2 due to absorption of radiation originating from the highly emitting shock layer promotes H2 emission before dissociation occurs at the shock, yielding 196% higher radiative heat fluxes. This emphasizes the importance of H2 radiation not only on the recession experienced by Galileo but also for future entries in gas giants. Accordingly, thermal nonequilibrium resulted in 25% lower radiative heating when compared to an equilibrium solution, contrary to previous investigations that neglected H2. Ablation products absorption was shown to counteract the increased emission due to precursor heating of H2. However, the ablation layer temperature must be accurately predicted using a material-response code coupled to the flowfield since radiative heating has been shown to significantly depend on this energy-exchange interaction. Finally, the tangent-slab and ray-tracing models agreed to within 12%.

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Review: Modelling chemical kinetics and convective heating in giant planet entries

Cited by 7 publications

References 53 publications

UQ eSpace

UQ eSpace

Reflected shock waves in air components and their mixtures: Validation of theoretical models

Computational fluid radiative dynamics of the Galileo Jupiter entry

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