Spark

Two days later, Chen Nian took a special plane to Chengdu Plain as planned, landed directly at the military airport, and then changed to a special car to go to the 611.

Yang Wei had been waiting for a long time. When he got off the car, he couldn't care about anything, so he welcomed him into the air-conditioned office.

These days, not all enterprises and institutions have air conditioners, especially military units. Under the influence of some inexplicable thinking, they always think that they can endure hardships more than others, so in many relatively backward areas, air conditioners are really not Necessities like later.

At least when he was in 601, Chen Nian had never seen a few air conditioners.

But in the 611 factory area, almost all indoor spaces are equipped with air conditioners. Compared with the 601 factory, the environment is much more comfortable.

Sit down, have a cup of tea first?

Yang Wei personally poured water for Chen Nian, and then asked the secretary to go down to arrange lunch. His attentive attitude made Chen Nian a little embarrassed.

Mr. Yang, you don't have to be so polite. I don't know what to do if you are so polite.

What else should I do? This will be your home from now on, come whenever you want!

Yang Wei chuckled and handed the tea to Chen Nian.

You don't know, I've been looking forward to your coming for a long time, but I never had the chance.

Obviously I came first, so it doesn't matter if you line up, make a phone call, or make an appointment with Chen Guo.

Why are you ranked last for me, do you think you are pitiful?

Chen Nian smiled helplessly and said:

Mr. Yang, you also know that I am not sure about your J-20 project, so I have to focus on things that are sure.

Okay, I'm just complaining, don't take it seriously. What's for lunch?

Yang Wei quickly changed the subject.

In fact, he is not particularly good at dealing with people. For example, just now, what he wanted to express was the importance he attached to Chen Nian, but when he said it, the flavor changed a little, and it sounded like he was complaining.

Er, something to eat?

Can you eat spicy food?

Extremely capable.

Chen Nian replied seriously.

That's good, then I will prepare it for you according to my menu! I will take you to see the dormitory first, it is specially vacated, and it is next to me.

After speaking, Yang Wei stood up, and Chen Nian quickly stopped him when he saw this:

Mr. Yang, don't worry, let's talk about work first, I have a good idea.

In fact, although Chen Nian had talked with Yang Weizhi about the technical difficulties of the J-20B before, he still didn't know enough about the details.

For example, just a lift fan involves many aspects such as wake extension, outlet flow diversion, and incoming flow combing.

In the previous life, the Western Polytechnic University had a cascade laboratory, which specifically sorted out these problems. It took a lot of time and was finally solved under the joint research of many countries.

At that time, the international units involved in the project included VITAL, Russian Federal Space Agency, German DLR, SNECMA, 606, Liyang Aviation, etc., and even introduced the latest genetic algorithm in the process, which shows the difficulty of these problems.

On the other hand, it also reflects the strong technical strength of the United States.

Therefore, when Yang Wei raised this question, Chen Nian immediately felt a kind of pressure.

It's really not that simple if we just rely on our own strength to solve it.

Hearing Chen Nian's words, Yang Wei sat down politely, and then said:

Let's talk about work first.

Entering his familiar rhythm, his temperament also changed accordingly. His confidence in technology gave him a kind of majesty like a general on the battlefield.

You also know that the biggest problem we are facing now is actually the problem of the lift fan.

The problems of the engine, the variable nozzle, and the vector nozzle are actually not too difficult when the material problem has been solved in the early stage.

But lift fans, we're completely new.

This technical step is very steep, and we can't even find a place to step up if we want to climb it.

The reason is very simple. What we have studied before is the conventional lift fan with rotor + stator combination. This kind of fan has a large volume, which greatly interferes with the aerodynamic shape of the aircraft, and also restricts the improvement of the aircraft's load performance. It does not meet our requirements for the fourth-generation shipboard. machine expectations.”

So, to really get there, we have to go up a step and go straight into the realm of counter-rotating fans.

I won't talk about the various issues involved in this, but let me talk about the first difficulty encountered so far.

That is the problem of the total pressure ratio of the lift fan.

We must theoretically verify the feasibility of a single large-diameter fan through the calculation of the outlet cross-section, boost ratio, and lift before proceeding to the next step of design and manufacturing.

But at this point, we're stuck.

The main reason is that we have no data on the loss of lift caused by ground effect, and no reference data on the total pressure ratio.

This makes our calculations look like headless chickens. Even if we use the traversal method, it is difficult to get results.

Having said that, Yang Wei sighed.

Another two difficulties with almost no solution.

Although many difficulties were encountered during the development of the J-20A, there are basically solutions to those difficulties. As long as you spend more time based on mature theories, even if you are carrying it on your shoulders, you can finally think about it. solution.

But for the lift fan, there is really no way.

If you want someone to carry it on your shoulders, you must have a pole and a rope.

The problem now is that the poles have not been made yet.

The reason why Chen Nian was called here was to see if he could make this pole.

On the other side of him, after listening to all the narrations, Chen Nian's eyes gradually became serious.

This problem is really not so easy to solve.

Although the nature of the event is similar to the fault tolerance factor in the previous AGT110 model, and the correct data can be obtained through the traversal method or exhaustive method, the difficulty of exhaustive enumeration on this issue is definitely not comparable to that of the AGT110 model.

Even with system support, the time savings it can bring are extremely limited.

Is it really necessary to use the system source again?

I'm really sorry

Otherwise, it can only be deduced through the data of F-35.

Thinking of this, Chen Nian asked:

Mr. Yang, do you have any information about F-35B here? The more detailed the better!

Yang Wei's eyes widened suddenly, and he asked in disbelief:

You know the F-35B??

broken!

Chen Nian suddenly reacted.

These days, the F-35 hasn't made its first flight yet!

There are at least two years before its information is made public, and now, for ordinary people like myself, it is impossible to get in touch with information related to it! ——

etc.

I don't know, how do you know?

Chen Nian looked at Yang Wei, the two looked at each other, and suddenly laughed tacitly.

Hey Hey

We do have some F-35B documents and information in our hands, but the amount is extremely limited and incomplete. If you need it, I will arrange someone to give it to you.

Of course, this is top-secret information, and there are some necessary procedures to go through, which may delay some time.

It doesn't matter.

Chen Nian nodded quickly, and continued to ask:

Can you tell me first, what information is included?

Rough aerodynamic layout, center of gravity data, design direction, and a small part of body material information, that's all, nothing else.

enough!

Chen Nian nodded in satisfaction.

Although it is indeed as Yang Wei said, the information can be said to be extremely thin, but the most critical center of gravity data is actually obtained.

That also means that according to the known take-off weight in his previous life, Chen Nian can roughly infer the lift that the lift fan needs to provide.

With this point, it is much simpler to calculate the total pressure ratio data required by the lift fan.

I will try to give the overall verification data, which may take a little time, and you can try to solve engineering problems first.

Such as materials, mechanical structures, etc.

If necessary, some private enterprises can be introduced to reduce the engineering pressure.

In the previous life, the research and development of the J-20 actually introduced a large number of private enterprises as support, and 611 did a good job of balancing confidentiality and efficiency. Chen Nian did not need to worry about this.

Understood, you can rest assured about this.

Yang Wei patted his chest and said.

The biggest problem has been solved for you. Are these trivial problems still called difficult?

Although the mechanical structure is not simple, especially in the manufacture of the transmission system, it can almost be said to challenge the limit of China's processing capabilities at this stage, but as long as there is a way to go, it doesn't matter.

The big deal is to manually grind it bit by bit.

Once the verification machine comes out, subsequent standardization will be much easier.

The two discussed some details again, and it wasn't until after twelve o'clock that Chen Nian finally followed Yang Wei to the restaurant with a lot of satisfaction.

The fact that the specifications of this reception were true also surprised Chen Nian.

Not to mention expensive, but in addition to the classic representatives of Sichuan cuisine, there are also special products from Chen Nian's hometown.

Although it is not authentic, it can be regarded as a little comfort to him, a wanderer who has been in a foreign land for a long time.

After all, the last time I ate these dishes was when my parents were arranged to travel to Xigong University, and his father made them

After a meal, the host and guest enjoyed themselves.

In the afternoon, Chen Nian immediately went to work. In order to let him familiarize himself with the environment and work system as soon as possible, Yang Wei took him personally.

.We are all using paperless design now, which means that the design work has jumped from 2D to 3D.

The software is new, and everyone is not very familiar with it.

However, after getting used to it, both efficiency and confidentiality can be greatly improved, so I think it's worth it.

Come on, let me teach you how to use this.

It's okay, I will use it.

Chen Nian replied with a smile.

Are you kidding me, as a person who traveled back from 2022, can I still not know how to use CAD and CATIA?

Not only these, including Nastran, FLUENT, and LS-DYNA later, he can also be said to be at his fingertips.

After all, this is the guy who eats.

Back then, he also spent a lot of time studying.

Seeing Chen Nian's skillful movements, Yang Wei couldn't help being stunned.

He really didn't know how to explain what he saw.

You must know that paperless design is not yet popular in this era. The most typical one, the original design of J-10, did not completely get rid of paper.

Although there are design software learning in the university courses, they are all basic introductions. If you want to master them proficiently, you must go through a lot of practical operations.

You can see Chen Nian's posture.

His fingers are flying, and he is familiar with all kinds of shortcut keys. In terms of software use, he is much better than himself.

This thing cannot be explained by genius.

If I had to describe my feeling at the moment, it was as if, in the body of the other party, lived a soul that did not belong to this era.

He stared blankly for a few seconds, finally came back to his senses and said:

Very good, very good, if you know how to use it, then I don't need to trouble you, I will tell you how to access the database and how to call historical data.

Chen Nian really didn't know this, after all, each research institute had a different authority management system.

After spending more than an hour, Chen Nian finally understood all 611 tools, and this speed also made Yang Wei amazed.

Young people are young people. I learned so fast. It took me a month to figure out this system myself.

Chen Nian didn't speak, just smiled and said:

Tools are easy to learn, but how to use them is rare. By the way, Mr. Yang, I have a request, can you help me see?

Say it! If you have any request, just ask, I will try my best to solve it for you!

Chen Nian nodded and continued:

I want to find someone.

Looking for someone? Something to do with the lift fan?

Yes, I'm looking for Chen Yunyong from the Yezha Laboratory—theoretically speaking, he is still your junior.

Chen Yunyong?

Yang Wei repeated it subconsciously, and after thinking for a moment, he replied:

I know this person and have dealt with him before.

However, when I left the cascade laboratory of NPU, he had just entered, so there is no deep friendship.

But I remember, isn't he an engine engineer? Can he be used for the lift fan?

It's useful.

Chen Nian said with certainty.

He clearly remembers that later, around 2015, it was Chen Yunyong who led Chengfei's thrust fan project, and made breakthrough progress in just two years.

There is absolutely no doubt about his ability.

You know, it is not that Shenfei does not have a thrust fan project, but from the establishment of the project in 1995 until he passed through that year, there was no splash.

This is also the reason why neither Yang Wei nor Chen Nian chose to go to Shen Fei to ask for someone.

At least in this project, they paddle too seriously.

Okay, I'll help you find it.

But... honestly, it might be a little hard.

Difficult? Why?

He is not in the country now, but in the United States.

America?? Really? Are you sure it's Chen Yunyong??

Chen Nian was shocked.

In his memory, Chen Yunyong did not go to the United States at all, so he always thought that the other party was just like Yang Wei, who had always developed in China.

This is very certain. He went to the United States after graduating from Xigong University. He originally planned to return to China within three years, but you know the situation there.

His formalities have never been completed. Up to now, he has been stuck for 5 years.

If we must, we can try to contact him, but it is very difficult to operate.

On the one hand, they won't let people go, and on the other hand, we also have concerns about confidentiality.

Understood. Let's try to contact him. In any case, we must bring him back——in the name of Shen Fei.

A paddling project is not so easy to attract attention.

I see.

Yang Wei nodded, discussed with Chen Nian, and left the laboratory.

Chen Nian, who stayed where he was, felt a little emotional.

He did not expect that such a talent at the level of a master teacher would have experienced such difficulties.

I don't know how many scientists are forced to stay there like him