Foi publicado online, no dia 28 Dez 2021, pelo períodico Combustion Science and Technology (CST), da editora Taylor & Francis, o artigo "Cold-crafted KNSu mechanically pressed burning rate for combustion pressure ranging from 0.9 to 7.7 bar".
Abstract
Potassium nitrate/sucrose propellant (KNSu) is a common solid propellant, which can be cold or hot crafted, employed in amateur and experimental model rockets. There is limited burning rate data available for the KNSu, particularly for the cold-crafted one. In this study, KNSu composed of 65% potassium nitrate and 35% sucrose was prepared through cold crafting and by pressing with a hydraulic press. For such a particular crafting method, we did not find any experimental data on the burning rate versus combustion pressure. Therefore, we experimentally determined the cold-crafted KNSu burning rate for pressure levels ranging from 0.9 to 7.7 bar. We employed a ballistic evaluation motor with varying nozzle diameters to obtain the desired combustion pressure. We demonstrate that the cold-crafted KNSu burning rate lies in the range of available data for the hot-crafted version. The burning rate is not sensitive to combustion pressure levels lower than 2 bar, and the combustion temperature is 98.7% of the theoretical value. We also explain the estimation the combustion pressure from the thrustplotted curve or by using the engine burning video.
Este artigo é uma produção do Grupo de Foguetes Carl Sagan (GFCS) da Universidade Federal do Paraná (UFPR).
O artigo está disponível no seguinte link:
O artigo está disponível no seguinte link:
Motor-foguete MTP em funcionamento.
Vídeo do teste 14 do motor-foguete MTP.
Primeira página do artigo publicado.
Taxa de queima (r) do propelente KNSu em função da pressão de combustão (po).
