On heat balance integral solutions of carbonaceous ablator response during reentry

Potts, Robert L.

doi:10.2514/6.1984-393

Cited by 2 publications

(4 citation statements)

References 15 publications

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“…The older HBI with quasisteady charring uses a convergence criterion of 5 K and can tolerate time steps of 0.25 s, except during periods of laminar-to-turbulent transition and particle-impact erosion, when 0.05-s time steps are used for accuracy's sake. 4 The finite-difference method used here 10 optimizes time steps dynamically, and these are on the order of 0.02 s for clear-air re-entry.…”

Section: Resultsmentioning

confidence: 99%

“…This tandem HBIfinite-difference approach is still much faster on the computer than a fully coupled simultaneous finite-difference solution of Eqs. (3)(4)(5).…”

Section: Numerical Implementationmentioning

confidence: 99%

“…In the preceding, O w is one of the unknowns to solve for, while ^n et , the net heat flux conducted into the exposed front-face surface, is a known function of t and 9 W , as established by a surface energy balance (see Ref. 4, 5, 6, or 10). This temperature dependence of the net surface heat flux makes the problem interesting, realistic, and difficult.…”

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confidence: 99%

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Enhancements to integral solutions to ablation and charring

Leone

Potts

Laganelli

1995

Journal of Spacecraft and Rockets

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Two new enhancements to the heat-balance integral (HBI) technique improve the rapid prediction of aerothermal response of heat shields of high-speed vehicles. The first enhancement uses a generalized cubic in-depth thermal profile to mitigate the well-known overreaction of classical HBI techniques to rapid changes in aerodynamic heat load. The second enhancement involves a direct method for solving in-depth charring problems in the context of an HBI solution. Together, these enhancements extend approximate HBI techniques to a broader range of aerothermal problems with improved accuracy at only a modest cost in computational speed.

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Section: Resultsmentioning

confidence: 99%

“…This tandem HBIfinite-difference approach is still much faster on the computer than a fully coupled simultaneous finite-difference solution of Eqs. (3)(4)(5).…”

Section: Numerical Implementationmentioning

confidence: 99%

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Enhancements to integral solutions to ablation and charring

Leone

Potts

Laganelli

1995

Journal of Spacecraft and Rockets

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“…For simplicity, this paper assumed a unity Lewis number so that the mass transfer coefficient equaled the heat-transfer coefficient, and the blowing effect due to ablative species was ignored. Then, the mass-transfer coefficient, g h , is expressed by way of a cold-wall heat flux: 19,20…”

Section: (1) Carbon Oxidation Model In High-enthalpy Convective Envirmentioning

confidence: 99%

Oxidation Behavior of Silicon‐Infiltrated Carbon/Carbon Composites in High‐Enthalpy Convective Environment

Ogasawara¹,

Ishikawa²

2001

Journal of the American Ceramic Society

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Thermal response and oxidation behavior of commercial metalsilicon-infiltrated carbon/carbon composites (MICMAT TM ; Si-CC) were evaluated in a high-enthalpy convective environment using an arc jet facility (an arc wind tunnel). Composite specimens were put into a supersonic plasma air stream having a gas enthalpy of 12.7-18.8 MJ/kg for 50 -600 s. Cold-wall heat fluxes measured by a Gardon-type calorimeter ranged from 1.0 to 1.8 MW/m 2 , and the maximum surface temperature reached 1300°-1660°C. After the arc jet testing, no surface recession was observed in the samples, and the mass loss rate of the composites was far less than that of graphite. The excellent oxidation resistance was caused by formation of a porous SiC layer at the surface of the composite. Oxidation behavior of the composites is discussed based on a simplified airflow blocking model of the porous SiC layer. The composites exhibited excellent oxidation resistance for short-term exposure in high-enthalpy airflow.

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On heat balance integral solutions of carbonaceous ablator response during reentry

Cited by 2 publications

References 15 publications

Enhancements to integral solutions to ablation and charring

Enhancements to integral solutions to ablation and charring

Oxidation Behavior of Silicon‐Infiltrated Carbon/Carbon Composites in High‐Enthalpy Convective Environment

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