Plenum Pressure Behavior in Transiently Heat Loaded Transpiration Cooling System

In this paper, the behavior of plenum pressure behind a transpiration-cooled porous material sample after an incident surface heat flux to is analyzed in experiment and theory. Two materials, zirconium diboride carbon/carbon, were characterized using pressure-based noninteger system identification method. The resulting impulse responses are based on two numerical models. One model calculates response by modeling sample’s conduction. A second considers additional allows changing mass flow rate through sample. experimentally obtained show stronger for increasing coolant rates. Both models cover trend, essentially depending volumetric transfer coefficient. However, only entire rebuilding experimental data. depends not parameters sample, but also volume plenum. reason that changes although at controller always stays constant.