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Enclosed black barrier, 2000-degree high temperature, how dangerous is the return journey of Shenzhou 14?

Views : 83
Author : Jazmyn
Update time : 2024-06-25 09:35:53

When we talk about the dangers of space flight, we often think of those images of high-speed travel through space. However, for the return journey of Shenzhou XIV, the danger is not only in the endless darkness of the vast universe but also in the process of returning to the atmosphere. What makes this return journey so difficult? The closed black barrier and the high temperature of 2000 degrees will become the double test that the crew of Shenzhou XIV needs to overcome.



Technical breakthrough on the return journey of Shenzhou XIV: material selection of closed black barrier

The material must have high-temperature resistance. When the spacecraft enters the atmosphere, the surface temperature of the spacecraft will rise rapidly due to friction and pressure. Therefore, the selected material must be able to withstand high temperatures without melting or deformation. At present, common high-temperature resistant materials include carbon composites, ceramic composites, etc. The material must have high-pressure resistance. During the process of returning to the Earth, the flight speed of the spacecraft will gradually increase, and it will face huge aerodynamic pressure. In order to ensure that the closed black barrier will not break, the selected material must be able to withstand the impact of high pressure. At present, common high-pressure resistant materials include high-strength metal alloys, high-strength ceramics, etc. The material must also have good thermal conductivity. When the surface temperature of the spacecraft rises, the heat needs to be quickly transferred and dissipated through the material to reduce the impact on astronauts and spacecraft equipment. Therefore, the selected material must have good thermal conductivity to ensure that the heat can be effectively transferred to the external environment of the spacecraft.

The material should also consider quality and reliability. As an important tool for performing space missions, each component of the spacecraft must have excellent quality and reliability. When selecting the material for the closed black barrier, it must be ensured that the material not only has the above characteristics but also has low weight and high reliability to ensure the overall performance of the spacecraft.


Shenzhou XIV

Protection measures for the return journey of Shenzhou XIV: Design and application of thermal protection structure

The outer layer in the thermal protection structure is silicon carbide composite material. Silicon carbide is a high-temperature ceramic material with excellent heat resistance and oxidation resistance. It can effectively isolate the heat conduction of high-temperature airflow to the spacecraft and maintain the stability of the internal temperature. The inner layer in the thermal protection structure is silicon carbide fiber composite material. Silicon carbide fiber is a lightweight and high-strength material with good thermal conductivity and mechanical properties. It can withstand high temperatures and pressures to protect the spacecraft from the influence of the external environment. In addition to the challenge of high temperature, Shenzhou XIV also faces the influence of aerodynamic forces during its return. When a spacecraft enters the atmosphere, it will be subject to the impact and friction of airflow. In order to solve this problem, aerodynamic heating control technology is also applied to the thermal protection structure.

Aerodynamic heating control technology is a method of controlling aerodynamic heating by adjusting the attitude and speed of the spacecraft. By accurately calculating and controlling the movement of the spacecraft, the impact and friction of the airflow on the spacecraft can be reduced, thereby reducing the temperature rise of the thermal protection structure. The thermal protection structure also includes thermal radiation materials and aerodynamic cooling technology. Thermal radiation materials can effectively radiate the absorbed heat and reduce the temperature rise of the spacecraft. Aerodynamic cooling technology reduces the temperature of the thermal protection structure by releasing coolant, further protecting the safety of the spacecraft.


molybdenum powder

Application of molybdenum powder as a high-temperature resistant material in the aerospace field

Engine parts: The engines of aerospace vehicles will generate extremely high temperatures when working. Molybdenum and its alloys are often used to manufacture high-temperature parts of engines, such as turbine blades, combustion chamber liners, nozzles, etc. because they can withstand extremely high-temperature environments without significant softening or melting. These components need to maintain high strength and stability at high temperatures for a long time, and molybdenum materials meet this requirement.

Heat shielding and heat exchangers: In the design of spacecraft and high-speed aircraft, molybdenum powder and its products (such as molybdenum foil and molybdenum wire mesh) are used as efficient heat shielding materials to protect the structure from damage by extremely high temperatures. In addition, molybdenum is also used to manufacture efficient heat exchangers due to its good thermal conductivity, which helps heat dissipation and thermal management, which is essential to ensure the stable operation of the system.

High-temperature alloy additives: Molybdenum is added as an alloying element to high-temperature alloys such as nickel-based and iron-based alloys, which can significantly improve the high-temperature strength, creep resistance and oxidation resistance of the alloy, which is particularly important for the manufacture of high-performance aircraft engine turbine disks, blades, and other key components.

Rocket nozzles: In liquid fuel rocket engines, molybdenum, and its alloys are used to manufacture nozzles because they can withstand the extremely high temperatures and corrosive environments generated by fuel combustion, ensuring the effective atomization and propulsion efficiency of the fuel.

Thermal control systems for satellites and spacecraft: The low expansion coefficient of molybdenum makes it an ideal choice for making thermal control systems for spacecraft, such as supporting structures for solar panels and supporting frames for antenna reflectors. It can effectively reduce deformation caused by temperature changes and ensure the precise operation of equipment.



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