The military-industrial scientific research system of the academic master

"Yeah, like a tokamak!"

At the same time, in the capital, Huairou Science City.

Chang Haonan was having a conversation with almost the same content with Han Chenfeng, director of Nuclear Industry Institute 240.

About three weeks ago, the latter and Liu Yongquan witnessed the test results of plasma distribution in the engine tail flame at the 410 Factory.

But at that time, Han Chenfeng's feeling was mainly novel.

Using the high temperature, high pressure, and approximately balanced flow environment in the engine combustion chamber as a plasma generation site is obviously not a major theoretical breakthrough. It is only equivalent to combining plasma physics and aerospace through an ingenious means. The majors are united.

If it weren't for such an eye-catching name as Chang Haonan, he would most likely just regard it as an interesting thing worth discussing with his colleagues and students at the next group meeting, and would not lend that precious device to him at all. He went out and personally went to the site to watch the test process as the person in charge of the technical team.

After all, between those engaged in aviation development and those engaged in nuclear physics, there is still a huge gap between different disciplines and between theory and application.

However, after Liu Yongquan reported the drag reduction and thrust increase they "accidentally" observed overnight, the response he received from Chang Haonan the next day was--

[I have discovered the existence of this situation during the preliminary calculation process, but the drag reduction effect produced by reducing the boundary layer turbulence and weakening the turbulent vortex system is not obvious enough and the stability is poor. Once the engine enters actual operation in the air After the state is reached, this effect will almost disappear, so there is no need to pay too much attention. If you are interested in this issue, you can have an interview the next time you come to Beijing...]

For Lao Liu, this matter is basically over.

He is very clear about the boundaries of his ability. Now is the point when the project pressure is greatest. Being distracted and paying attention to deeper theoretical issues will not only be unhelpful in solving the problem, but will also distract the attention that is already quite limited, affecting To the development progress of turbofan 10G.

But for Han Chenfeng, it was completely different.

Liu Yongquan told him Chang Haonan's reply as part of a casual chat during the regular work meeting between the two parties a few days later.

Then……

Han Chenfeng almost jumped up from his chair.

If he had decided to participate in this project before, it was mainly to enjoy the favor of Academician Chang, so as not to be brushed off in the first round of academician selection for two consecutive years.

So, from the moment I heard this response, I felt more than just joy.

There are also research topics!

Although Han Chenfeng himself also thought about the link of "the plasma drag reduction effect leads to an increase in engine thrust", the difficulty of summarizing the reasons afterwards is obviously not at the same level as predicting the phenomenon in advance.

What's more, Chang Haonan also made it very clear that it was discovered during the calculation process and was not a simple qualitative inference.

It is no exaggeration to say that the work contained in this sentence alone could be published in a top physics journal such as Nature Physics or Physical Review Letters after a slight expansion.

The tone of the other person writing this sentence was as normal as eating and drinking, indicating that the research involved obviously went beyond that.

When he first thought of this, Han Chenfeng couldn't wait to leave for the capital immediately to communicate with Chang Haonan.

But given the latter's current status and how busy he is with the work at hand, it's certainly impossible to make an appointment to meet him just by making a phone call or sending an email.

So Han Chenfeng had to be patient and report step by step through Liu Yongquan's channels according to the procedures, and finally got an appointment today when Chang Haonan was available.

After hearing Chang Haonan's idea of ​​"using the magnetic field effect combined with the electric field to assist in controlling the plasma diffusion range on the surface of the aircraft", he unexpectedly asked the destined question:

"Like a tokamak?"

It is generally believed that the deuterium-tritium reaction requires a temperature close to 100 million degrees to be easily realized. However, strictly speaking, the number here is actually just for ease of understanding. It is not the macroscopic temperature in the usual concept, but the energy corresponding to 10keV. calculated value.

But in any case, there is obviously no occasion that can directly withstand such outrageous high temperatures. Moreover, in addition to temperature, the occurrence of fusion reactions also requires the density of particles and the confinement time to meet certain requirements. These are not easy to build a pool like fission reactions. conditions met.

In the universe, stars with sufficient mass and density can constrain plasma through their strong gravity and provide conditions to maintain fusion reactions. However, for humans, even if we hollow out several other planets in the solar system, it will not be able to accumulate Such a large amount of matter.

Therefore, the activity range of high-energy particles can only be restricted through inertia or magnetic field, which is equivalent to using an unprecedentedly powerful insulation layer to isolate the temperature within a relatively narrow range, so that the fusion reaction can occur in a physical container. .

Therefore, when hearing the keyword "magnetic field control", it is quite logical to think of the magnetic coil constraint device of the annular vacuum chamber, also known as a tokamak.

As expected, Han Chenfeng received a positive answer.

…

After a while, he finally came back to his senses:

"Academician Chang... are you also interested in the application of fusion energy?"

After asking, he realized that it was not appropriate, so he prepared to make up for it:

"What I mean is that the Huaxia Tokamak II has started trial operation in Luzhou this year. If you are interested in controlled nuclear fusion, shouldn't you have cooperated with them a long time ago..."

Seeing that the other party was more far-sighted than he thought, Chang Haonan couldn't help but laugh:

"I think any technician related to physics will have a dream related to fusion application... Of course, I am no exception."

A correct version can be found in the 16-9 book and forum!

He explained:

"But the plasma sheath on the surface of the aircraft is far from being comparable to nuclear fusion in terms of energy, volume or density... For example, only about 100V of voltage and a magnetic field of less than 0.1T are needed to effectively change the plasma electron density 4cm away from the surface, and this value is probably not even as good as the magnetic field of the auxiliary equipment in the tokamak..."

It was not until then that Han Chenfeng finally reacted. Chang Haonan meant that this technology was similar to magnetic confinement technology to a certain extent, not that he had to turn to fusion research now.

It was a bit embarrassing for a while.

Fortunately, he had not forgotten the key purpose of his visit this time, so he took advantage of Chang Haonan's explanation and asked:

"Academician Chang, I saw your plan from General Manager Liu before... But I still don't understand how you calculated such an accurate result?"

"In addition..."

Han Chenfeng's old face was a little red, but perhaps it was the only opportunity in his life, and he couldn't afford to look back too much.

Therefore, after a little hesitation, he continued:

"To be a little boastful, our 240 Institute is at the forefront of the country in the development of plasma sources, as well as electron density measurement and experimental verification. At the same time, we have a certain research foundation. In addition, we have now established a normalized cooperative relationship with the 606 Institute. If you have related needs in your future research, we are willing to provide all the help within our capabilities..."

The purpose of the 240 Institute when it was first established was just to ensure the exploration and development of China's uranium resources. The main research field is geology rather than nuclear physics.

However, later, with the changes of the times, research content related to nuclear energy utilization and particle physics has gradually increased.

So Han Chenfeng said that he had a research foundation, but it was not forced to flatter himself.

But the statement of "willing to provide help" at the end was just for the sake of sounding good.

The actual meaning was clear to both of them -

Boss, boss, take me with you!