Physics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.498l&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Physics
Scientific paper
test vehicle mainly designed and produced together with its students. It is a small, ballistic nose/cone/flare capsule called DART, the Delft Aerospace Re-entry Test, and its main goals are to develop and test new technologies like hot metallic structures, and improve scientific knowledge in the field of aerodynamics, for use in the development of future launch vehicles and hypersonic transport vehicles. a hot metallic outer structure, and innovative methods to protect the vehicle against the high re-entry fluxes. Together they form a new active cooled heat shield that is cheap, both to produce and to refurbish. 100kW/m2 to 400kW/m2, a revolutionary cooling mechanism based on water evaporation from a porous media is under development. The principle is simple: the heated outer wall, with a high emission coefficient, radiates heat both to the environment and to the inside of the vehicle. Separated from the outer wall by a small gap is a highly porous material filled with water that is evaporated as it absorbs the radiated heat. Then the steam is expelled out of the vehicle by the same gap transporting even more heat as it is convected against the outer wall. evaporation energy meaning that not more than 10 litters are needed to cool the entire vehicle to the temperature range allowed by its constituent materials. explore the concept in detail, and physical mechanisms involved, and optimise it!
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