I went to Zhengzhou on business the day before yesterday and took the sleeper. There are three businessmen nearby. They are very talkative, talking about family, career and relaxed topics. When talking about rocket technology, they talked about their disdain for Japan and so on, which made me very painful. I told them that in fact, when it comes to rockets, Japan is the best and has the greatest potential, and Asia is the first and Russia is not comparable.
The friend across the street was unhappy and said that Japan was the best in Asia and our Long March was the best.
I said calmly: I am talking about rocket specific impulse, fuel environmental protection and rocket environmental protection, because this is the potential and the direction of technological development.
Why should we use solid rockets to bind our Long March? It is because the liquid rocket technology with high thrust is too high to do it, and the solid rocket technology is too low to do it, so it must be bundled! !
The opposite person paused and said doubtfully, this is also true.
I pointed out:
The development history of rocket fuel is divided into four generations according to the first-class rocket fuel.
1 generation stopped talking.
second generation
Fuel: unsymmetrical dimethylhydrazine. The oxidant is 4- oxide 2- nitrogen. Features: mature technology, low price, but great toxicity.
Representative figures: American Hercules, Soviet Proton, European Ariane 4, our China Long March 2, 3, 4.
third generation
Fuel: kerosene, oxidant is liquid oxygen.
Features: non-toxic, high performance, high fuel density, relatively small rocket diameter, mature technology and low price.
Representative figures: Saturn in the United States (for landing on the moon), Union in the Soviet Union,
The fourth generation
Fuel: liquid hydrogen. The oxidant is liquid oxygen, which is non-toxic and has extremely high performance. The technical threshold of hydrogen-oxygen engine is high.
This engine technology is only mastered by the United States and Europe, and Japan's H2 is the best. Its characteristics are: safety and controllability.
I went on to say:
1: kerosene/liquid oxygen engine: Russian RD- 180 thrust 423 tons, RD- 19 1M thrust 20 1 ton.
2. The high thrust of liquid hydrogen/liquid oxygen engine is RS-68338 tons from America. Esa Vulcan -2 137 tons.
Japan's LE-7A, 1 12 tons. But it is the liquid hydrogen/liquid oxygen engine with the largest specific impulse, reaching 43 12n' s/kg. Staged combustion is the most advanced liquid hydrogen/liquid oxygen engine in the world. The high thrust liquid hydrogen liquid oxygen engine has high technology. Russia used energy to land on the moon before, and it kept exploding, so it gave up.
However, China's 120 ton kerosene/liquid oxygen engine and 50 ton liquid hydrogen/liquid oxygen engine have just been successfully tested and are not yet mature. Japan has been put into practical use, and we are far behind Japan-estimated to be 20 years behind.
I also told them that the third-generation kerosene/liquid oxygen engine just tested in China was actually RD- 120 imported from Russia.
The passengers in the upper berth are already dissatisfied and say, don't talk nonsense. Japan's technology is so great, why not send a man to heaven?
I smiled and asked a good question. I said: In fact, we are behind Japan in space technology. Because it needs advanced technology in many technical fields, such as materials, control and information. It's not hard to understand. Look at the gap between us and Japan in the field of mechanical and electrical equipment manufacturing.
I went on to say:
Japan is one of the participating members of the International Space Station. Japanese astronauts have been to the International Space Station many times, which you must know! ! By participating in the International Space Station, Japan has maintained its competitiveness in the high-end space field. In addition, Japan has enough capacity to manufacture advanced satellites. The International Space Station has also brought Japan a benefit: it can enjoy space resources, and the space station is large, with a wide range of activities and complete functions. Participating countries can coordinate and enjoy various scientific and technological experimental resources on the space station, which greatly improves their understanding of the frontier scientific and technological fields, and astronauts live a "space life" in it. In contrast, China's astronauts just "live in space". The most important thing here is that the International Space Station has saved a huge sum of money for Japan's space industry, enabling the government to invest more money in medical care and education. ...
The comprehensive strength of the European Space Agency is no less than that of China. They are also members of the International Space Station, so they won't carry people into the sky alone. It is necessary to do a good job in manned space flight and try not to waste taxpayers' money. This is the basic feature of a people-led country engaged in space flight. So Europe and Japan don't carry people into the sky. We have a replica Soyuz manned spaceship. There is no plagiarism in Japan and Europe, so it is confusing to say that we are better than Europe and Japan.
The three men were impressed and nodded frequently.
I think they all accepted it, so I said seriously: Actually, what bothers me most is that some people think that the scientific community in China saw Shenzhou VI at first sight, but they didn't know that the theme of modern physics was microscopic. It is really difficult for a country to have any outstanding characteristics in basic science (at least in physics).
However, our government has never compared the development of industry, economy and entertainment with that of foreign countries. Because these ordinary people can see and feel it, they can know whether it is good or bad at a glance, so they have been comparing how many kilowatts of generators, what collisions there are, and what space technologies ordinary people don't understand. It's all up to you anyway. Just say it.
There is nothing wrong with manned space flight. If you are willing to spend some money on a project like CERN, it is called rejuvenating the country through science and technology! !
These three people completely agree. They say it's better to listen to me than to watch CCTV for ten years.
I smiled with relief, paraphrasing Mr. Li Ao's words: A truly enlightened and progressive country was not created by a group of slaves, but by people with independent personalities and free thoughts.
All three people agreed, and then we talked about how to go abroad. Their knowledge is to earn more money and then invest in immigration, which I quite agree with. Finally, we left each other's phone numbers, hoping that the next party would be abroad.