关键词: 单元推进剂;预热;建模;能量损失

Abstract: To evaluate pre-heating process of N₂O monopropellant thruster and reduce pre-heating energy, a numerical model was developed. The simulative result demonstrates that large energy input for N₂O decomposition is primary due to unnecessary heat energy absorbed by thruster casing and heat dissipation from thruster’s side-wall,which are 66 percent and 31 percent of total input energy respectively.Different pre-heating results are compared by changing the parameter of model. Suggestions are made to reduce pre-heating energy by means of increasing heater power,scaling down thruster,as well as improving heating method.

Key words: Monopropellant;Preheating;Model;Energy loss