Computer Science
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.555e..37a&link_type=abstract
Proceedings of the 4th International Spacecraft Propulsion Conference (ESA SP-555). 2-9 June, 2004, Chia Laguna (Cagliari), Sard
Computer Science
Scientific paper
Paper presents the results of near-propellant energy flux measurements and modelling of the propellant ablation in the APPT. Experiments were produced on APPT stand with bank energies up to 300 J. It is shown that APPT operation mode is essentially dependent on propellant behaviour. Results of measurements of energy dissipated in a thermal skin-layer in the Teflon propellant per one discharge are presented. For bank energy up to 300 J, energy dissipated in a thermal skin layer is less than accounted from model of Teflon thermal degradation. There is no observed delay between the current beginning and plasma appearance near propellant. Apparently at the beginning of the discharge, propellant flow rate is provided due to non- thermal or high efficiency mechanisms. Relative effect of conductive and radiative mechanisms of energy transfer to the propellant is estimated. Teflon propellant losses calculated from heat flux measurements and measured in experiments are compared. The results of experiments confirm the dominant role of conductive mechanism of energy transfer to the propellant surface.
Alexeev Y.
Kazeev M.
Kozlov Valerii V.
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