1989
DOI: 10.1002/ceat.270120161
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Modelling and simulation of monopropellant hydrazine thrusters for spacecraft position control

Abstract: 15] Chohan, R.K., The effects offluid conditions andproperties on the response time of temperature sensors, to he published.Modelling of the kinetics of a 20-N hydrazine thruster is carried out by considering two different heterogeneous reaction channels for hydrazine decomposition to the intermkdiate ammonia. The parameters of the reactor model are estimated by making use of temperature profiles at the wall of the decomposition chamber. Simulated ageing of the catalyst revealed an increase of the rate of deac… Show more

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Cited by 8 publications
(3 citation statements)
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“…The outstanding properties of Shell 405 catalysts are presumably due to a more open structure [85] or to the presence of a high fraction of η-alumina crystals (size ca. Ir crystals display an average size of around 2 nm (190 m 2 g −1 -Ir for the fresh catalyst) and show an epitaxial growth on the support with (110) orientation, which increases with firing time [36,86]. The dense crystals prevent penetration of hydrazine into the interior of the pellets, and decrease the generation of catalyst fines via break-up processes from internal overpressure [36].…”
Section: A Shell 405 Catalyst (Usa)mentioning
confidence: 99%
See 1 more Smart Citation
“…The outstanding properties of Shell 405 catalysts are presumably due to a more open structure [85] or to the presence of a high fraction of η-alumina crystals (size ca. Ir crystals display an average size of around 2 nm (190 m 2 g −1 -Ir for the fresh catalyst) and show an epitaxial growth on the support with (110) orientation, which increases with firing time [36,86]. The dense crystals prevent penetration of hydrazine into the interior of the pellets, and decrease the generation of catalyst fines via break-up processes from internal overpressure [36].…”
Section: A Shell 405 Catalyst (Usa)mentioning
confidence: 99%
“…Oxidation of 1 leads to the formation of monodentate diazene ligand which can disproportionate into nitrogen and hydrazine. A modeling and simulation of a thruster application is described [86]: the catalyst must have high activity, high thermal conductivity, low thermal expansion, high thermal stability, high resistance to thermal shock, and good mechanical strength. Complexes of amides (M − NH 2 ), imides (M=NH) and nitrides [Cl 2 Os≡N] 2− are also well known in organometallic chemistry.…”
Section: Homogeneous Catalysis and Coordination Chemistry Of Hydrazinementioning
confidence: 99%
“…Reaction (1) is a highly exothermic reaction which could cause a temperature increase of up to 1273 K . The resulting high temperatures could have a significant effect on the structural properties of the catalyst and lead to a decrease in its activity .…”
Section: Introductionmentioning
confidence: 99%