Modeling of the catalytic properties of high-temperature surface insulation in a dissociated carbon dioxide — Nitrogen mixture

Afonina, N. E.; Gromov, V. G.; Kovalev, V. L.

doi:10.1007/bf02698792

Cited by 6 publications

(7 citation statements)

References 11 publications

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“…In the rarefied Martian atmosphere the effect of heterogeneous catalysis on heat transfer is more significant than for entry into the Earth's atmosphere [108][109][110][111][112][113][114][115].…”

Section: Heterogeneous Catalytic Processes On Entry Into the Martian mentioning

confidence: 99%

“…The numbers correspond to the experimental regimes [20] In [118,119] the mechanism of heterogeneous recombination of the products of carbon dioxide dissociation was considered in detail. Models of the catalytic properties of heat shield coatings [34,35,116] and quartz based on this approach were developed in [110][111][112][113][114][115].…”

Section: Heterogeneous Catalytic Processes On Entry Into the Martian mentioning

confidence: 99%

“…In [110][111][112] heat transfer at reentry velocities up to 8 km/s was investigated. Nonequilibrium adsorptiondesorption reactions of O and N atoms and CO molecules and their recombination in Eley-Rideal reactions were taken into account.…”

Section: Heterogeneous Catalytic Processes On Entry Into the Martian mentioning

confidence: 99%

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Experimental and Theoretical Simulation of Heterogeneous Catalysis in Aerothermochemistry (a Review)

Kovalev¹,

Колесников²

2005

Fluid Dyn

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The design of aerospace vehicles has required the solution of radically new scientific and technological problems. One of the important problems has been to create reusable heat shield materials. In [1, 2] information concerning the methods and results of solving these problems, including the development of composites from ultrathin quartz fibers and carbon-carbon materials for the "Buran" orbital vehicle heat shield, was presented. The basic thermophysical characteristics of these materials include both the rate or probability coefficients of heterogeneous nitrogen and oxygen atom recombination and the accommodation coefficients of energy recombination at high surface temperatures. In the present paper the experimental and computational aspects of determining these parameters, which are also of interest for new heat shield materials for future space transport systems, are discussed.

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Section: Heterogeneous Catalytic Processes On Entry Into the Martian mentioning

confidence: 99%

Section: Heterogeneous Catalytic Processes On Entry Into the Martian mentioning

confidence: 99%

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Experimental and Theoretical Simulation of Heterogeneous Catalysis in Aerothermochemistry (a Review)

Kovalev¹,

Колесников²

2005

Fluid Dyn

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“…A sufficiently general phenomenological model of recombination in dissociated carbon dioxide at high temperature surfaces of the three thermal protection materials is developed [4,14], taking into account the reaction of adsorption-desorption of oxygen atoms and carbon monoxide molecules and their recombina tion in the reactions of Eley-Rideal and Langmuir-Hinshelwood. However, the measurement data on heat fluxes are insufficient to select unambiguously the parameters for the corresponding model for the metals under consideration and quartz.…”

Section: Two Parameter Modelmentioning

confidence: 99%

“…The aerothermodynamics of spacecraft entry into the Martian atmosphere has been studied in many works based on solution of the full Navier-Stokes equations [2,3] and the equations of a viscous shock layer [4], taking into account nonequilibrium gas phase and surface catalytic reactions. To reduce the margin of error in the assignment of the input data, it is necessary to carry out experimental studies of heat transfer and the catalytic properties of thermal protec tion materials in high enthalpy ground facilities.…”

Section: Introductionmentioning

confidence: 99%

Effects of catalytic recombination on the surface of metals and quartz for the conditions of entry into the Martian atmosphere

2016

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Heat transfer to water cooled surfaces of metals and quartz is studied experimentally in subsonic jets of dissociated carbon dioxide at a stagnation pressure of 80 hPa and enthalpy of 9 and 14 MJ/kg, corre sponding to the descent conditions of the ExoMars space vehicle into the Martian atmosphere, using an RF induction plasmatron at the Institute for Problems in Mechanics, Russian Academy of Sciences. The mea surements of heat fluxes to surfaces of different materials showed the significant effect of the catalytic prop erties of surfaces that can be arranged in the following descending order of the heat flux: silver, copper, stain less steel, quartz. The effect of strong modification of the silver surface is recorded during the tests; the max imum value of the heat flux is achieved after 15 min exposure of the surface to the jet. In the computational analysis of heat transfer, we used a two parameter model of heterogeneous recombination of O atoms and CO molecules at the surface. With this model, the effective recombination coefficient of CO molecules is deter mined on the water cooled surfaces of quartz and stainless steel, based on the experimental data on heat fluxes. 2 0. m m J J J J m m + + + = O O WO O WCO CO CO CO WCO CO 2 , , m J K c K c m J K c

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Afonina¹,

Gromov²,

Kovalev³

2002

Fluid Dynamics

View full text Add to dashboard Cite

Modeling of the catalytic properties of high-temperature surface insulation in a dissociated carbon dioxide — Nitrogen mixture

Cited by 6 publications

References 11 publications

Experimental and Theoretical Simulation of Heterogeneous Catalysis in Aerothermochemistry (a Review)

Experimental and Theoretical Simulation of Heterogeneous Catalysis in Aerothermochemistry (a Review)

Effects of catalytic recombination on the surface of metals and quartz for the conditions of entry into the Martian atmosphere

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