In the latest episode of the program "Let's Talk", Liu Daxiang, an 86-year-old academician of the Chinese Academy of Engineering and an expert in aviation power, cried on the spot when he recalled the instructions of Wu Daguan, the father of China's aircraft engines, before his death.
From the J-20, Zhi-20, Y-20 to the large aircraft C919, there is a common "heart" behind the aircraft with different uses - aircraft engines. How was the "heart" of Chinese aircraft born? What kind of wind and rain is behind the scenes of aviation power?
01
1 ton of hail in 1 minute
Aircraft engines are still in normal operation to qualify
Liu Daxiang was one of the main figures in the construction of the aircraft engine high-altitude simulation test bench, allowing China to achieve a breakthrough from 0 to 1.
What "tests" do an airplane need to go through? At the scene of the program, Liu Daxiang introduced that the requirements for the development of aircraft are extremely strict, in the aircraft engine high-altitude simulation test bench, to do hail tests on the engine, a minute to drive a ton of hail into the engine, simulate the extreme weather that has not been encountered in a century, the engine can still operate normally in this case, only to be qualified.
Liu Daxiang said that there are also regulations for engines to "stop" in the air. The engine is allowed to stop only 0.02 times in the air for 10000 hours of continuous operation, and almost does not stop. "The testing of engine parts alone requires 200,000 to 300,000 hours, and even every screw and nut needs to be taken out for testing."
02
To solve the problem of aircraft engines
The older generation of commanders-in-chief issued military orders
What is the difficulty in building an aero engine? Liu Daxiang revealed in the program that there are many stages of high-pressure compressors, which need to be calculated, coordinated, and tested; The most difficult material and processing and manufacturing of high-temperature and high-strength materials is the turbine, which is too high temperature and far exceeds the melting point of the material.
Liu Daxiang was "fighting" with this temperature at the age of 27. At that time, he was ordered to lead the team to a certain division of the Air Force to "squat point" to provide technical support and conduct research. There, Liu Daxiang came into contact with the first fighter of his working life, the J-7.
However, the J-7 has insufficient thrust and short endurance when no afterburner. In order to cure this problem, the older generation of grand masters even took their heads and made military orders.
After more than two years of unremitting efforts, Liu Daxiang and his colleagues finally solved the problem by improving the turbine blades. As a result, Continental became the third country in the world to independently develop air-cooled hollow turbine blade engines.
"If there is a problem with any part of the engine, something will happen, you must go your own way, you must be serious, you must not be sloppy."
03
"Don't make a high-altitude platform
Just died in Songhualing and buried in Guanwu Mountain."
In 1970, Liu Daxiang and the technical backbone of the unit were sent to Songhualing in the mountainous area of northwest Sichuan. During this trip, they shouldered the arduous mission of building a high-altitude simulation test bed for the continent's aero-engine.
At that time, among the five permanent members of the United Nations, only China did not have its own high-altitude platform. In 1980, when the domestically assembled engine went to the UK for assessment tests, Liu Daxiang received the task of not only completing the test, but also learning how the British aerial platform was conducted.
When he returned to China, Liu Daxiang and his entourage collected and sorted out more than 1 million words of information, which also became an important reference for China to build its own high-altitude platform. "At that time, everyone had to go and bring a small book every day, write down any ideas, and come back in the evening to take notes on each other."
Just as Liu Daxiang and others were preparing to make a big move, the second phase of the high-altitude platform project was listed as a "slow construction project". Funds have been sharply reduced, projects have come to a standstill, and many scientific and technological backbones have been lost... As a core member, Liu Daxiang held a mobilization meeting and took the lead in saying: "If you don't make a high-altitude platform, you will never leave the ravine, die in Songhualing, and bury in Guanwu Mountain!" ”
Liu Daxiang said that the high-altitude platform is a national need, and in order to make the country strong, anyone who comes must make personal sacrifices. In 1995, Liu Daxiang presided over the completion of the overall joint commissioning of the high-altitude platform and delivered it to the state for acceptance. After the United States, Russia, Britain and France, the mainland has become the fifth country in the world to have a large-scale continuous high-altitude platform with a continuous gas source.
04
Recall the father's dying instructions of the father of aero-engines
He burst into tears
Wu Daguan, the father of China's aircraft engine, is one of the older generation of scientists who has the deepest influence on Liu Daxiang. Recalling the bits and pieces of the year and Wu Lao's instructions before his death, Liu Daxiang couldn't help but cry at the show scene.
"A few days before Wu Lao died, when I visited the hospital again, he took my hand and told me 'four requirements': we must act according to scientific laws, we must strengthen advance engine research, we must dare to tell the truth, and we must get mainland aircraft engines up!"
In the face of three "future technologies" such as ordinary people traveling by plane, traveling to New York on the same day, and using clean energy on large planes, Liu Daxiang is most looking forward to building a hypersonic civil aviation aircraft that flies from China to the United States in 3 to 4 hours.
"Because it will allow us to truly realize our dream of 'next neighbor to the world'." No matter which plan it is, it requires the unremitting struggle of aeronautical power engineers. ”
Choose one thing and go with your life
Throughout your life, live up to your faith
Salute!
Source: CCTV News Client
Process Editor: TF060