What are the steps for the Shen 13 astronauts to go home? CCTV popular science: 4-6 minutes of “black barrier”

According to the official news from the China Manned Space Office, the Shenzhou 13 manned spacecraft has completed all the scheduled tasks and will choose an opportunity to evacuate the core module assembly of the space station in the near future and return to the Dongfeng landing site. At present, the Shenzhou 13 crew has completed the spacecraft. Preparations before evacuation.

So what steps are required from the separation of the Shenzhou 13 spacecraft from the core module of the space station to the final return to the ground?@CCTV NewsResearch conducted.

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Procedure 1: Leave the station and board the ship, and evacuate the space station assembly.

The Shenzhou 13 manned spacecraft and the Tianhe core module are first separated. Before separation, the astronauts need to close the two-way pressure chamber door connecting the core module and Shenzhou 13, and formally evacuate the space station. After entering the spacecraft, the astronauts need to Immediately change into the cabin pressure suit that was worn during the expedition.

Procedure 2: Be on duty in the return cabin and wait for the return flight.

In the spacecraft’s return cabin, the astronauts also need to make some preparations before the return, including the setting of the return state and the sending of on-orbit commands.

Procedure 3: Before entering the atmosphere, complete the separation of the two compartments.

The front section of the Shenzhou spacecraft is the orbital module, the middle section is the return module, and the rear section is the propulsion module. Before de-orbiting, the orbital module and the return module will be separated first, then the engine will be turned on, the spacecraft will gradually descend the altitude, and before entering the atmosphere, the separation of the propulsion module will be completed, and the return module will enter the return orbit.

Level 4: Enter the atmosphere and withstand the test of harsh environments such as high temperature and vibration.

The return cabin of the spacecraft descends to about 100 kilometers from the ground. After entering the atmosphere, the environment is the worst during the return process. The return cabin is violently rubbed with the air and will be surrounded by flames. The temperature at the bottom is as high as thousands of degrees Celsius, and the cabin will appear Vibration, noise overload phenomenon,During this period, there will be a 4-6 minute “black barrier”, and the return capsule will lose contact with the ground at this time, but the ground can be tracked by means of electronic scanning radar and so on..

Procedure 5: Open the parachute and land firmly.

At an altitude of about 10 kilometers from the ground, the return cabin will open the guide parachute, the deceleration parachute and the main parachute in turn, and throw away the heat-proof outsole. When the ground is about one meter in the bureau, the reverse thrust engine will be activated, and the descending speed will drop to two meters, and finally the return capsule landed safely.

Looking forward to the safe return of the heroes!

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