OMG！ Academician Wang Wei released ten aerospace questions in 20021,please answer them.

At the 20021China Aerospace Congress with the theme of "New Starting Point, New Journey and New Vision", the China Aerospace Society released the scientific and technical problems in the aerospace field.

They are: periodic reversal of solar magnetic field and detection of solar global magnetic field, feedback effect and baryon loss in galaxy ecological environment, long-term extraterrestrial survival of human beings using in-situ space resources, ultra-low temperature management technology of quasi-absolute zero degree in space, design technology of reusable liquid rocket engine, spacecraft design technology based on nuclear fusion propulsion system, aerodynamic layout design method and technology of hypersonic vehicle in large airspace and transonic domain, Air-breathing high-speed aircraft internal and external flow coupling acoustic vibration environment evaluation and prediction technology, geosynchronous orbit satellite-ground all-weather secure communication technology, space high-voltage high-power generation and power management technology.

As the publisher of 20021scientific and technical problems in the aerospace field, Wang Wei, academician of China Academy of Sciences and director of R&D department of China Aerospace Science and Technology Corporation, said that in scientific and technological innovation activities, especially original innovation activities, it is more critical to ask questions than to solve them. In the past year, world space activities continued to be highly active. Space powers strengthen the top-level strategic planning in the space field, actively deploy the development and utilization of space resources, and seize the commanding heights and initiative of space development. Under the guidance of the grand goal of becoming a space power and a science and technology power, China's economic and social development and improvement of people's livelihood need space science and technology solutions and space development innovation power more than ever before.

This release is the second release activity since the China Aerospace Congress first released the space issue in 2020. As a bridge connecting the front-line scientific and technological workers in the aerospace field, China Aerospace Society has continuously promoted the collection and release of scientific and technological issues in the aerospace field as a key task. The problems and difficulties recommended by the Society were selected in the selection activities organized by China Association for Science and Technology year after year, and released at the annual meeting of China Association for Science and Technology. The suggestions of scientific and technological workers have been submitted to the central and higher-level units one after another, and relevant literature analysis and popular science works have been published.

Scientific and technical problems in the space field 202 1

1. Periodic reversal of solar magnetic field and detection of total solar magnetic field

The solar activity cycle is essentially caused by the periodic reversal of the solar magnetic field, which further restricts the development of solar physics. Lack of observation data is the key to solve the problem, which requires the combination of solar physics and modern space technology to open the door to breakthrough.

2. Feedback effect and baryon loss in the ecological environment of the Milky Way.

In the process of galaxy evolution, there is a feedback effect of supernova explosion or black hole jet on the environment. Due to the lack of observation means, its physical process is still unknown. Trying to observe the hot gas produced by this effect is the key to solve the mystery of baryon loss, which is of great significance to understand the evolution of galaxies and promote the development of cosmology.

3. Using in-situ space resources to realize human long-term extraterrestrial survival.

In-situ utilization technology of space resources is the key technology for human beings to go out of the earth and go deep into space to realize sustainable development through the investigation, acquisition and utilization of natural or abandoned resources of extraterrestrial bodies. This technological breakthrough will give birth to emerging fields such as extraterrestrial celestial body mining, space manufacturing and space immigration.

4. Space quasi-absolute zero ultra-low temperature management technology

Quasi-absolute zero in space refers to the lowest temperature infinitely close to thermodynamics, which is the temperature of matter when the kinetic energy of particles is so low that quantum mechanics is infinitely close to the lowest point. The ultra-low temperature management technology of quasi-absolute zero in space is the key technology needed for ultra-high sensitivity detection and perception of weak signals in the universe. This technological breakthrough will be of great significance for detecting weak signals in the universe, understanding the origin of the universe and exploring alien life.

5. Design technology of reusable liquid rocket engine

Reuse of space transportation system is an important development direction of space transportation technology, and the design technology of reusable liquid rocket engine is its key supporting technology. This technology will lay a solid foundation for the development of China's reusable space transportation system, and greatly enhance China's ability to access and control space.

6. Spacecraft design technology based on nuclear fusion propulsion system

Spacecraft based on nuclear fusion propulsion system is an aircraft that obtains large thrust through nuclear fusion reaction for deep space flight exploration, which has the remarkable characteristics of high specific impulse, large thrust and long life. This technology will greatly improve the performance of spacecraft and is an important technical guarantee for human beings to enter the moon and stay away from the solar system.

7. Aerodynamic layout design method and technology of transonic hypersonic vehicle in large airspace.

The aerodynamic layout design method and technology of large airspace transonic hypersonic vehicle need to adapt to the requirements of large-scale flight airspace and velocity domain changes, which is the focus and difficulty of aerodynamic design and also a major basic problem faced by transonic hypersonic vehicle. The breakthrough of this technology will greatly expand the range of activities of superb aircraft.

8. Air-breathing high-speed aircraft internal-external flow coupling acoustic-vibration environment evaluation and prediction technology

The research on acoustic vibration environment technology of air-breathing high-speed aircraft with internal and external flow coupling will establish accurate evaluation and prediction methods, which is an important basis to ensure the flexible flight of air-breathing high-speed aircraft in wide speed domain and multi-airspace. This technical breakthrough is of great significance to the new air-breathing space transportation system and its engineering application.

9. All-weather secure communication technology between satellite and ground in geosynchronous orbit

The all-weather secure communication technology between satellite and ground in geosynchronous orbit is an important technology to realize the integrated secure communication between heaven and earth, and an important means to ensure information security in the future, which has important application value in the fields of high security level and long security, such as finance.

10. Space high voltage and high power generation and power management technology

Space high-voltage and high-power power generation and power management technology is the key technology to break through the bottleneck of large-scale exploration and utilization of space resources and support the development of very large spacecraft in the future. This technological breakthrough will promote the development of manned landing on the moon, the construction and development of lunar base, deep space exploration, space solar power station and other major space missions.

Proofreading: Zhang Yan