Shenzhou XII will return to Earth today, and its return process is very complex, not only every command action must be minute by minute, but also to withstand the harsh environment through the atmosphere. So what are the main tests to be experienced on the way home of Shenzhou XII?
The return process is intensive and complex and must be disposed of quickly
The first test is that shenzhou xii has a dense and complex action process in the process of returning to the earth, each action time is short, once there is a problem, the controller must deal with it immediately, otherwise the consequences will be unimaginable.
Yang Haifeng, head of the flight control technology team of the Shenzhou 12 manned spacecraft of the Fifth Academy of Aerospace Science and Technology Group: There are many key events in it, and they are very dense, followed by the fact that many of these events are basically irreversible. Once the brake engine is turned on, our plan now is that it can be disposed of within 30 seconds of starting, and if it exceeds 30 seconds, we think that the track has been lowered, and we have entered an irreversible process.
High-speed friction produces aerodynamic heat, and there will be a "communication black barrier"
In addition, in the process of passing through the atmosphere, the return capsule and the atmosphere will produce violent friction, so that its extravehicular temperature of up to thousands of degrees, although the Shenzhou spacecraft has a mature heat-proof technology, but this process, the biggest test is that the communication will be interrupted, ground monitoring and control personnel can not grasp the state of the spacecraft, once there is a problem, completely rely on astronauts and spacecraft to deal with it autonomously.
Yang Haifeng, head of the flight control technology team of the Shenzhou XII manned spacecraft of the Fifth Academy of Aerospace Science and Technology Group: Because it is high-speed friction that produces aerodynamic heat, a plasma will be formed around the air, which we generally call the communication black barrier, which is equivalent to the ground and the astronauts are completely out of touch, even if you want to send instructions to deal with it, there is no way.
Source: CCTV News Client