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Performance of high-temperature lightweight multilayer insulations
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NSTL
Elsevier
Multilayer insulation (MLI) is a kind of high-temperature insulation which employs multiple high-reflective screens to retard the radiation heat， but analyzing and optimizing its heat transfer characteristics by experimental and theoretical models remains low-efficiency and non-visualization。 In this work， finite element analysis (FEA) models verified by comparing the simulation and experiment results are established to systematically reveal the numerous and complex effect factors， including the number of layers， thermal boundary， fibrous insulation density and emissivity of reflective screens。 The results show that the top temperature of MLIs can be reduced by increasing the number and the emissivity of reflective screens， and the density of fibrous insulation， but there is a reasonable number of layers to achieve the best comprehensive performance of MLI。 In addition， the proportion of radiative heat transfer in the total heat transfer increases with increasing heating temperature。 The feasibility of optimizing thermal insulation performance based on the FEA models is confirmed by designing the MLIs with stainless steel and aluminum as reflective screens。 And the results indicate that the FEA methods can significantly reduce the number of trials and realize the optimal design of MLI。
Finite element analysisHeat transfer simulationMultilayer insulationThermal insulation performance
Zhou Q.、Wang P.、Wu K.、Cao J.、Zhang H.、Zhang Y.、Niu B.、Long D.
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State Key Laboratory of Chemical Engineering East China University of Science and Technology
NSTL
Elsevier
