Porous ultra-high-temperature ceramics (UHTCs) are a candidate group of materials for
transpiration cooling of hypersonic vehicles due to their exceptionally high melting point,
typically above 3000 K. Their high operating temperature permits a higher amount of
radiative cooling than that achievable with conventional materials, which reduces the
required coolant mass flow rate to cool the surface. This work experimentally examines the
internal and external flow behavior of porous UHTC made of zirconium diboride (ZrB 2) for …

Porous ultra-high-temperature ceramics (UHTCs) are a candidate group of materials for
transpiration cooling of hypersonic vehicles due to their exceptionally high melting point,
typically above 3000 K. Their high operating temperature permits a higher amount of
radiative cooling than that achievable with conventional materials, which reduces the
required coolant mass flow rate to cool the surface. This work experimentally examines the
internal and external flow behavior of porous UHTC made of...