Analysis of an active high-temperature thermal insulation system

摘要: Abstract An active thermal insulation system consisting of a semitransparent porous medium with gas injection is considered for protecting structure from intense radiation flux (≈5 MWm −2 ). The dependence the thermophysical properties on temperature and dissociation are taken into account. Air, hydrogen, dissociating ammonia as representative gases. effects nondissociating gases distributions in solid examined. reduces penetration depth little few millimeters thickness. present protection most effective when advection-radiation parameter N c / R larger than 1 or 2.