Spacecraft propulsion systems
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Overview of Spacecraft Propulsion Systems
Spacecraft propulsion systems are essential for maneuvering, attitude control, and maintaining or changing orbits in space. Over the decades, a variety of propulsion technologies have been developed, each with unique advantages and challenges for different mission requirements 135.
Chemical Propulsion: Traditional and Reliable
Chemical propulsion remains the most widely used method for launching spacecraft and for in-space maneuvers. These systems typically use either solid or liquid propellants, with monopropellant and bipropellant thrusters being common for satellite stationkeeping and attitude control 135. Chemical thrusters are valued for their simplicity, reliability, and ability to provide high thrust, making them suitable for rapid maneuvers and initial orbit insertion 35. Recent developments also focus on green propellants to improve safety and reduce environmental impact .
Electric Propulsion: Efficiency and Long-Duration Missions
Electric propulsion (EP) systems, such as ion thrusters, Hall effect thrusters, and pulsed plasma thrusters, have gained significant attention for their high efficiency and ability to provide continuous low-thrust over long durations 37910. EP systems use electrical energy to accelerate propellant, resulting in much higher specific impulse compared to chemical propulsion, which translates to significant propellant mass savings 710. This makes them ideal for deep space missions, large satellite constellations, and end-of-life disposal maneuvers 710. The increasing availability of onboard power has enabled the deployment of all-electric satellites, further expanding the use of EP 710.
Multimode and Dual-Mode Propulsion: Flexibility and Mass Savings
Emerging multimode and dual-mode propulsion systems integrate two or more propulsion methods, often sharing propellants and hardware, to provide greater mission flexibility and adaptability 46. For example, systems that use hydrogen peroxide as both a monopropellant for attitude control and as an oxidizer with kerosene for orbit control can simplify spacecraft design and reduce mass 46. These approaches are especially beneficial for small satellites, where mass and volume constraints are critical 69.
Advanced and Hypothetical Propulsion Concepts
Research continues into advanced propulsion concepts, including high-power electric propulsion for megawatt-scale missions and even propulsion systems that do not rely on mass ejection, such as those manipulating internal centrifugal forces 28. While some of these ideas are still experimental or theoretical, they represent potential breakthroughs for future long-duration and interplanetary missions 28.
Propulsion for Small Spacecraft
Small and very small spacecraft, such as CubeSats and nanosatellites, require compact and efficient propulsion systems. Options include miniaturized chemical thrusters, electric propulsion (like pulsed plasma or ion engines), and systems using advanced propellants such as hydroxyl-ammonium nitrate or xenon . The choice of propulsion depends on mission needs, with electric propulsion often preferred for its efficiency in small satellite applications .
Trends and Future Prospects
The field of spacecraft propulsion is rapidly evolving, with increasing adoption of electric propulsion, development of green and multimode systems, and exploration of novel concepts for future missions 16710. The rise of large satellite constellations and new mission profiles, such as debris mitigation and in-space logistics, are driving demand for more efficient, flexible, and cost-effective propulsion solutions . Heavy investment and global competition are accelerating innovation, promising continued advancements in spacecraft propulsion technology 110.
Conclusion
Spacecraft propulsion systems are diverse and continually advancing, with chemical and electric propulsion dominating current applications. New developments in multimode, green, and high-power systems, as well as research into revolutionary concepts, are shaping the future of space exploration and satellite operations. The ongoing evolution of propulsion technologies will enable more ambitious missions, greater flexibility, and improved efficiency for spacecraft of all sizes.
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Двигательные установки и ракетные двигатели малой тяги на различных физических принципах для систем управления малых и сверхмалых космических аппаратов
Propulsion systems and low-thrust rocket engines based on various physical principles are preferable for use in small and very small spacecraft, with their use being particularly beneficial for the "Mini," "Micro," and "Nano" classes.
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