مدلسازي سيستم پيشرانش كاتاليستي در حالت احتراق ناقص

Modeling of Catalytic Propulsion System at Incomplete Combustion State

Catalytic propulsion system is used in adjustment of satellite orbits. Hydrazine is conventionally used as propellant of the system, whose decomposition in the presence of Ir/y-Alumina catalyst causes hot gases, which leads to the propulsion force for the above purpose. This decomposition process, which is a catalytic combustion, comprises production and subsequent decomposition of ammonia. The specific impulse of such a system is 180-240 seconds. If there is any problem in the catalyst which causes hydrazine decomposition to result only in ammonia, the combustion is incomplete, in which case system performance will be below optimum. In this paper, the performance of the system is modeled in the incomplete combustion state, whereby the results show that the specific impulse in the condition is 150 seconds. This model is expected to provide proper insight into the relationships governing the system. Existing experimental data are also in line with those of the present model.