Estimation of Surface Heat Flux in the Wind Tunnel Cascade Blades

Abstract

Space and time dependent heat flux on the surface of a blade mounted in the wind tunnel cascade is estimated by solving the inverse heat conduction problem (IHCP). The solution of the whole domain IHCP is carried out using two versions of the Variable Metric Method (VMM). These are the Symmetric Rank-one (SR1) and the Broydon– Fletcher–Goldfarb–Shanno (BFGS) versions. The objective is to evaluate the whole domain IHCP solution method based on VMM in the real experimental situations with complex geometries. The SR1 shows a little better performance than the BFGS. ANSYS software is utilized for the numerical solution of the direct heat conduction problem within the blade. The temperature data of sensors are acquired via an experiment on a heated blade encountering the cooling air flow inside a linear cascade wind tunnel.