Computer Science
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.486a&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Computer Science
Scientific paper
The Report comprises the results of theoretical and experimental research aimed at development of special devices intended to increase the effectiveness of spacecraft (SC) descent systems onto the surface of planets with atmosphere. The subject of research is the thermal protection of a SC. Inflatable braking units (IBU) made of elastic materials and substantially reducing the value SC's ballistic parameter are considered as special devices. Parametric evaluations of influence of descent SC's ballistic coefficient on specific convective heat fluxes at the region of stagnation point were the basis of experimental research. Analysis and experiments have shown that real materials permit to develop inflatable devices, geometrical and mass properties of which allow reducing a value ofby 2...2.5 times in comparison with the existing ones. This leads to a reduction of the heat fluxes by 10...15 times. At such an intensity of external convective heat fluxes, the most effective thermal protection of a DV turns out to be a protection composed by means of a so-called "heat screen method". Their emanation provides an equilibrium state of the system. In accordance with the results of expert estimations, the dependency of ballistic coefficients values of DV vs. payload (PL) masses regarding producible modern materials is presented. In the framework of projects fulfilled on the basis of current research, elastic thermal protection was developed in order to protect the stagnation region of DV. The Report gives a comparison of possible mass characteristics of IBU-based DV with analogous parameters of real DV carrying out ballistic trajectory descent.
Alifanov O. M.
Outchvatov V. I.
Pichkhadze Konstantin M.
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