caa a22 4500 606198350 CHVBK 20210128100933.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s00348-015-1951-5 doi (NATIONALLICENCE)springer-10.1007/s00348-015-1951-5 A low-computational-cost inverse heat transfer technique for convective heat transfer measurements in hypersonic flows [Elektronische Daten] [F. Avallone, C. Greco, F. Schrijer, G. Cardone] The measurement of the convective wall heat flux in hypersonic flows may be particularly challenging in the presence of high-temperature gradients and when using high-thermal-conductivity materials. In this case, the solution of multidimensional problems is necessary, but it considerably increases the computational cost. In this paper, a low-computational-cost inverse data reduction technique is presented. It uses a recursive least-squares approach in combination with the trust-region-reflective algorithm as optimization procedure. The computational cost is reduced by performing the discrete Fourier transform on the discrete convective heat flux function and by identifying the most relevant coefficients as objects of the optimization algorithm. In the paper, the technique is validated by means of both synthetic data, built in order to reproduce physical conditions, and experimental data, carried out in the Hypersonic Test Facility Delft at Mach 7.5 on two wind tunnel models having different thermal properties. Springer-Verlag Berlin Heidelberg, 2015 Avallone F. Department of Industrial Engineering, University of Naples "Federico II”, Via Claudio 21, 80125, Naples, Italy aut Greco C. Department of Industrial Engineering, University of Naples "Federico II”, Via Claudio 21, 80125, Naples, Italy aut Schrijer F. Delft University of Technology, Kluyverweg 1, 2629 HS, Delft, The Netherlands aut Cardone G. Department of Industrial Engineering, University of Naples "Federico II”, Via Claudio 21, 80125, Naples, Italy aut Experiments in Fluids Springer Berlin Heidelberg 56/4(2015-04-01), 1-12 0723-4864 56:4<1 2015 56 348 https://doi.org/10.1007/s00348-015-1951-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-1951-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Avallone F. Department of Industrial Engineering, University of Naples "Federico II”, Via Claudio 21, 80125, Naples, Italy aut NATIONALLICENCE 700 1- Greco C. Department of Industrial Engineering, University of Naples "Federico II”, Via Claudio 21, 80125, Naples, Italy aut NATIONALLICENCE 700 1- Schrijer F. Delft University of Technology, Kluyverweg 1, 2629 HS, Delft, The Netherlands aut NATIONALLICENCE 700 1- Cardone G. Department of Industrial Engineering, University of Naples "Federico II”, Via Claudio 21, 80125, Naples, Italy aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/4(2015-04-01), 1-12 0723-4864 56:4<1 2015 56 348