Document Type : Technical Note


1 Ph.D. Student, Aerospace research institute, Ministry of Science, Research and Technology, Tehran, Iran

2 Assistant Professor, Aerospace research institute, Ministry of Science, Research and Technology, Tehran, Iran


In this paper, the catalyst bed of a 10 N hydrazine monopropellant thruster was designed. The catalyst bed is including iridium granules, which is used to decompose the hydrazine in monopropellant thruster. Hydrazine must be decomposed almost completely in the catalytic chamber, because it is a carcinogenic chemical fuel and on the other hand, achieving the maximum power from the thruster is also an important goal. As a result, the effect of change in catalytic chamber length on the mass fraction of chemical species including hydrazine, ammonia, nitrogen, and oxygen was studied. Also, after determining the length of the catalytic chamber, the diameter of the nozzle throat corresponding to the same length was determined.


Main Subjects

[1]  A-S.Yang, "Satellite Hydrazine Propulsion System Design Trades," J Da-Yeh Univ, 10, pp. 41–50, 2001.
[2]  CD. Brown Spacecraft propulsion, American Institute of Aeronautics and Astronautics, 1996.
[3]  DI Han, CY Han, HD Shin, "Empirical and computational performance prediction for monopropellant hydrazine thruster employed for satellite," J Spacecr Rockets, vol. 46, no. 6, pp. 1186–1195, 2009,
[4]  JN Hinckel, JAR Jorge, Neto TGS, MA Zacharias, JAL Palandi "Low cost catalysts for hydrazine monopropellant thrusters," 45th AIAA/ASME/SAE/ASEE Jt Propuls Conf Exhib, 2009,
[5]  A.E Makled, H Belal, "Modeling of hydrazine decomposition for monopropellant thrusters," Aerosp Sci Aviat Technol , 2009.
 [6] H Karimaei, M.R Salimi , H Naseh , E Jokari,  "Design of Physical Configuration of a 10N Monopropellant Hydrazine Thruster," Space Science and Technology, vol. 12, no. pp. 13-22, (in persian).
 [7] V Shankar, K Anantha Ram, KA Bhaskaran, "Experimental investigations of the 10 N catalytic hydrazine thruster," Acta Astronaut, vol. 12, no.4, pp. 237-249, 1985, 90038-4.
[8]           V Shankar, KA Ram, KA Bhaskaran,"Prediction of the concentration of hydrazine decomposition products along a granular catalytic bed," Acta Astronaut , vol.11, no.6, pp. 287-299, 1984, (84)90038-9.