Thermal Protection Using CMC Materials
Thermal Protection Using CMC MaterialsByN.UdaykumarWhat is
Thermal Protection System(TPS)?Protection of a body from the severe
heating encountered during hypersonic flight through a planetary
atmosphere. Means temperature distribution on the
vehicle.Aerodynamic Heating
Thermal Protection System materials1. Reinforced carbon-carbon
(RCC)Fibrous refractory composite insulation tiles (FRCI)Flexible
Insulation Blankets (FIB)Toughened unipiece fibrous insulation
(TUFI) tilesFelt reusable surface insulation (FRSI)
Ceramic Matrix Compositeconsist of ceramic fibers embedded in a
ceramic matrix, thus forming a ceramic fiber reinforced ceramic
(CFRC) material. The matrix and fibers can consist of any ceramic
material, whereby carbon and carbon fibers can also be considered a
ceramic material.PropertiesHigh fracture toughness or Crack
resistanceGood Electric InsulatorsCMCs are scarce except for
oxidation at temperatures above 1000 C
THERMAL MANAGEMENTPassiveSemi-PassiveActive
PASSIVEAn insulated structure is used for moderate heat fluxes
for relatively short times.
SEMI-PASSIVEA heat pipe could be used for high heat fluxes for
long periods of time. Heat is transferred by a working fluid to
another region of the heat pipe where the heat is radiated away. As
with hot structures, the structure operates hot. A heat-pipe-cooled
leading edge
ACTIVEConvective cooling is often utilized for a high heat flux
and long times. Convective cooling is used in the propulsion
system, where the heat is transferred into the coolant. Actively
cooled structure
Thermal management approach for several vehicles as a function
of temperature & exposure time
If system fail
CONCLUSION
Hypersonic air-breathing vehicles will require moving beyond an
insulated aluminum "airplane", such as the Space Shuttle Orbiter,
to a vehicle with multiple TPS and hot structure approaches. The
ability to build and fly these vehicles successfully will depend on
the ability to use multiple types of CMC structures, but only after
solving the environmental durability and fabrication challengesAny
Quieres
Thank You
