Abstract
During reentry of hypersonic vehicle into the earth’s atmosphere, very high temperature is developed at the vehicle surface which is conducted into the internal structure. So a good thermal protection system (TPS) is necessary to keep the internal structure within the safe operating temperature limit. Multi Layer Insulation (MLI) is a high-performance thermal insulator which can maintain very high temperature gradient. The effect of spacer configuration and emissivity of foil on bottom layer temperature is investigated. One-dimensional temperature distribution inside MLI under aerodynamic heating is obtained through numerical simulation. It is found that the configuration of spacer has no evident effect at low temperatures. Higher emissivity of foil results in higher insulation capability above 350 K. It has come out that an increase in emissivity to 10 times will reduce the bottom layer temperature around 200 K from a peak of 575 K. The problem was simplified into combined 1D conduction and radiation model with transient nature.
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Sutheesh, P.M., Chollackal, A. (2020). Numerical Simulation and Performance Analysis of MLI During Reentry of Hypersonic Vehicles. In: Drück, H., Mathur, J., Panthalookaran, V., Sreekumar, V. (eds) Green Buildings and Sustainable Engineering. Springer Transactions in Civil and Environmental Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-1063-2_38
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DOI: https://doi.org/10.1007/978-981-15-1063-2_38
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