Characteristics and flight performance of the Tianwen-1 Mars Lander propulsion system

Abstract

<p indent="0mm">The weight and size of the propulsion system for the Tianwen-1 Mars Lander are strictly restricted. Instead of a commonly used propulsion system, a medium-pressure two-propellent propulsion system and tanks with a shell of 7055 high strength material are used to realize the target of lightness and miniaturization. The chamber pressure is approximately 2 MPa. Compared with traditional propulsion systems, the weight is reduced by approximately 53 kg and the height is reduced by approximately 919 mm. This is the first application of a medium-pressure two-propellent propulsion system in the aerospace field. We analyze the system design, components, technical characteristics, key technologies, and solutions, and finally describe the flight performance of the propulsion system. The results indicate that all functional and technical indexes meet the target well, the propulsion system works reliably, key technologies have been proven, and the flight of the Tianwen-1 was successful. This article provides important references and guidance for the design and application of medium-pressure two-propellent propulsion systems for future complex deep space probes.