Abstract
A heated air tunnel and specially its test section features, designed for studies of wall protection from high temperature gases, are described. A coolant, moving through the porous wall, flush fitted in the horizontal test section floor, achieves its thermal protection. Preliminary velocity measurements, carried out at ambient temperature and without injection, within the test section, pointed out the following aerodynamic characteristics: stationarity and turbulence intensity in the potential flow, boundary layer features over the porous wall according to the entrance test section boundary conditions, wall friction coefficient estimation. Velocity and temperature profiles, in non-isothermal conditions, over the porous wall with or without cooling air injection, are reported. They point out the injection rate influence, variable from 0 to 2 %.
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