Endurance Firing Test Results of the Long Life 1N Hydrazine Thruster

Lanthanum doping for longevity of alumina catalyst bed in hydrogen peroxide thruster

“…The test sequence is shown in Table 7. The duty cycle and duration of each test set were determined by referring to the test sequence of hydrazine and hydrogen peroxide monopropellant thrusters in considering the response time of the pneumatic valve and the hydrogen peroxide consumption [19,22,23]. The test sequence consisted of 6 test sets.…”

Hydrazine decomposition phenomena observed by Neutron radiography at a catalyst bed

“…These differences were assumed to allow mitigation of the catalyst bed damage in our long life thruster. 14) Penetrate Injector Diffusion injector Figure 2 Catalyst Granules Temperature Distribution Images of the Catalyst Bed Cylindrical Surface Inlet Pressure : 2.31MPa, 150msec ON/1sec Pulse Period Those visualization techniques reveal many hydrazine decomposition phenomena at the catalyst bed, but visible light visualization technology can only observe events taking place in the surface layer from a visual perspective. However, most hydrazine decomposition phenomena occur in the center side of the catalyst bed, which is the motivation of this work to observe inside the latter.…”

“…14) The penetrate injector has a short service life due to the high load of the catalyst bed, while the diffusion injector has a longer life, due to soft hydrazine decomposition at the catalyst bed.…”