For the first time, Shenzhou XIII used rapid return technology, and the return capsule was in an upright state. How difficult is this state?

For the first time, Shenzhou XIII used rapid return technology, and the return capsule was in an upright state. How difficult is this state? Let's discuss this issue below, hoping that this content can help friends in need.

The return capsule of the Shenzhou 13 manned spacecraft landed safely, and the three astronauts are in good health. The completion of the Shenzhou 13 manned spacecraft also represents the successful conclusion of the core technology inspection phase of China's space station infrastructure construction. Once again, we warmly welcome the three astronauts Zhai Zhigang, Wang Yaping and Ye Guangfu to return home safely. Autumn is over and spring is back. season.

The Shenzhou 13 manned spacecraft is the last mission in the core technology inspection phase of China’s space station construction. Shenzhou 13 withdrew from the space station’s key module assembly at 0:44 on April 16 body, gradually returning home.

This time the Shenzhou 13 manned spacecraft adopts rapid return technology, which takes about 20 hours less than the Shenzhou 12. It can be seen that the Shenzhou 13 has emerged from the main module assembly of the space station. It took 9 hours and 12 minutes to realize the safe landing.

Shenzhou 13-1 is composed of three parts. The first part is the orbital module, the middle part is the return module, and the final part is the propulsion module. After withdrawing from the space station assembly, the three modules are together at 390,000 It sailed around the earth on a meter-high orbit, taking about 7.5 hours for 5 laps. After that, Shenzhou 13 carried out its first attitude adjustment and flipped 90 degrees, changing from the normal flying attitude to the vertical position, and then launched the orbital module and returned The separation of the cabin is at work.

After completing the second attitude adjustment, the return module and the propulsion module continued to flip 9 degrees. Here, the return module made a circle through the second attitude adjustment, and then the propulsion module and the return module began to descend into orbit. The return capsule and the propulsion module separated at an altitude of 145 kilometers. The return capsule gradually entered the earth's atmosphere and passed through the "black barrier zone." Under rapid friction, the return capsule was like a fireball, and then it went through the opening of the traction parachute and the main parachute. , drifted slowly to the ground, put aside the insulation of the soles, and ignited the reverse thrust boat No. 13 to land safely with a distance of more than 1 meter from the ground.

In fact, we can see from the scene that the return capsule of Shenzhou 13 is in a standing state. Under normal circumstances, the return capsule is tilted to a certain extent after landing. It can be said that Shenzhou 13 The return to state and the whole process of the spacecraft are excellent. This is the second time in the history of China's manned spacecraft.

The last time the return capsule showed a standing state after landing can be traced back to 17 years ago. The return capsule of the Shenzhou-6 manned spacecraft landed safely at the main landing site in Siziwang Banner, Inner Mongolia. That return capsule also Showing a standing state, it can be said that that state is the ultimate.

The three astronauts are in a lying state at the bottom of the return capsule, and the return capsule lands standing up, which is the best state for the astronauts. The landing status of the return capsule must be accurately grasped. The key consideration is the disconnection time of the main parachute.

As can be seen from the short video scene, the five-star red flag was fluttering in the wind after the medical insurance staff put it up, which means that the wind at the landing site may be very strong. The main glider will slow down the return capsule as much as possible, so its range must be very large, about 1,200 square meters. If the astronauts do not disconnect immediately after the return capsule lands, the return capsule may be involved in strong winds and may even cause them to walk on the road, which has an impact on the astronauts' lives and health.

This main parachute is all performed by astronauts to determine the timing of cutting. This time, the Shenzhou 13 return capsule was still standing after landing in windy temperatures. It has to be said that the astronauts The timing of disconnecting the main parachute is very precise.

After the Shenzhou 13 astronauts returned to Earth safely, they still have to face the last challenge, which is to adapt to the Earth's powerful environment. Because Shenzhou 13 was the first time China's manned spacecraft carried out an orbital flight for 6 months, it lasted 183 days, which was twice as long as that of Shenzhou 12.

The longer they stay in the microgravity environment of space, the greater the impact on the human body of astronauts, including cardiovascular and cerebrovascular diseases and skeletal muscle tissue, they have to use A period of 6 months to reintegrate into the earth's dynamic environment. You can also see that astronauts sit down or lie down after leaving the cabin. This is because after 6 months of space exploration, their bones will loosen and their muscles will flow out, making them unable to adapt to a standing state. .

The safe return of Shenzhou 13 to Earth also represents the successful conclusion of the core technology inspection phase of China’s space station construction. In 2022, China’s space station will continue to launch six times, and it is very likely that it will be launched in 2022. In two days' time, the Tianzhou-4 cargo spacecraft will head to the space station to provide various supplies for the Shenzhou-14 manned spacecraft to be launched.

I hope that the construction of the Chinese Space Station will begin, and the Chinese Space Station will also officially enter the operational stage in 2023!