TY - JOUR
ID - 3759
TI - Extending Inverse Heat Conduction Method to Estimate Flight Trajectory of a Reentry Capsule
JO - AUT Journal of Mechanical Engineering
JA - AJME
LA - en
SN - 2588-2937
AU - tahmasbi, vahid
AU - noori, sahar
AD - Department of Aerospace Engineering, Amirkabir University of Technology, Tehran, Iran
Y1 - 2020
PY - 2020
VL - 4
IS - 4
SP - 505
EP - 522
KW - Charring ablator
KW - inverse heat conduction problem
KW - flight trajectory
KW - Reentry Vehicle
DO - 10.22060/ajme.2020.17000.5845
N2 - This study is dedicated to the solution of the inverse heat conduction problem for estimation of the time-varying velocity and altitude profiles regarding the flight trajectory of an earth-entry capsule. Four tungsten-rhenium sensors are supposed to be embedded inside the ablative heat shield of the probe, three of which cannot tolerate high-temperature conditions and burn out during entry and the other one remained intact until the end of the simulation. The conventional Levenberg-Marquardt method is reinforced by a relaxation scheme to prevent unfavorable severe oscillations encountered in the inverse iterations. To keep the generality of the method, no prior knowledge on the thermal condition and surface recession of ablative insulator is utilized in the current estimation. Therefore, in the associated direct problem, velocity and altitude profiles are given and the temperature field inside the heat shield is determined. Accordingly, a solution of the direct problem consists of (i) bow shock calculations in dissociated air (ii) boundary layer solver to compute stagnation heating rate (iii) identification of the thermal response of charring ablative heat shield. It is shown that if the standard deviation of the temperature measurement error is 5 K, estimation of altitude and velocity are associated with approximately 10 and 5 percent normalized error, respectively.
UR - https://ajme.aut.ac.ir/article_3759.html
L1 - https://ajme.aut.ac.ir/article_3759_ef028821ce79decc2542fe6c4aef93e8.pdf
ER -