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

Yang Wei had been waiting for a long time, and when he saw him get out of the car, he didn't care about anything, so he first welcomed him into the air-conditioned office.

In recent years, enterprises and institutions have not all had air conditioning, especially military units, under the influence of some inexplicable thoughts, they always think that they can endure hardships more than others, so in many relatively backward areas, air conditioning is really not a necessity like later.

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

However, in the 611 factory, almost all indoor spaces are equipped with air conditioning, and the environment is much more comfortable than that of the 601 factory.

"Sit down, have a cup of tea?"

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

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

"What else? This will be your home in the future, come whenever you want! ”

Yang Wei smiled and handed the tea to Chen Nian.

"You don't know, I've been looking forward to you coming over for a long time, but I haven't had a chance."

"Obviously, I came first, whether it's queuing, calling, or making an appointment with Chen Guo."

"Why did you give me the last line, do you say pitiful?"

Chen Nian smiled helplessly:

"Mr. Yang, as you know, I don't have a certain grasp of your J-20 project, so I have to focus on something that I am sure of first."

"Understand, I'll complain, don't take it seriously. What to eat for lunch? ”

Yang Wei quickly diverted the topic.

He is actually not particularly good at dealing with people, for example, just now, in fact, what he wanted to express was the importance he attached to Chen Nian, but as soon as the words came out, it changed a little, and it sounded like a complaint.

"Uh, what's all?"

"Can you eat spicy?"

"Exceptional."

Chen Nian replied with a serious face.

"That's good, then I'll prepare it for you according to my menu! I'll take you to see the dormitory first, which is specially vacated, right next door to me. ”

As he spoke, Yang Wei stood up, and Chen Nian hurriedly stopped him when he saw this:

"Mr. Yang, don't worry, let's talk about work first, I have a number in my heart."

In fact, although Chen Nian had talked to Yang Weiwei 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 diversion, incoming flow carding, etc.

In the last life, Xi'an University of Technology had a Yezha laboratory, which specifically sorted out these problems, and it took a lot of time to finally solve them under the joint research of many countries.

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

On the other hand, it also reflects the strength of the United States' technological strength.

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

If we have to rely on our own strength, it is really not that simple.

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

"Let's talk about work first."

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

"As you know, the biggest problem we are facing now is actually the problem of the lift fan."

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

"But the lift fan, we are completely unfamiliar."

"It's a very steep technical step, and we can't even find a place to put our feet on it."

"The reason is very simple, what we have studied before is a conventional lift fan with a combination of rotor + stator, which is large in size, interferes greatly with the aerodynamic shape of the aircraft, and also restricts the improvement of the aircraft's load performance, which does not meet our expectations for the fourth-generation carrier-based aircraft."

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

"I won't talk much about the various issues involved, but let's talk about the first difficulty I have encountered at present."

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

"We have to theoretically verify the feasibility of a single large-diameter fan through the calculation of the outlet cross-section, boost ratio, and lift force before we can proceed to the next step of design and manufacturing."

"But at this very point, we're stuck."

"The main reason is that we don't have data on the loss of lift from the ground effect, and we don't have reference data for the total pressure ratio."

"As a result, our calculations are like flies without heads, and even with ergodic methods, it is very difficult to get results."

Speaking of this, Yang Wei sighed.

There are two more difficult points that have almost no solution.

Although there are many difficulties encountered in the development of the J-20A, there are basically solutions to those difficulties, as long as more time is paid according to mature theories, even if it is carried by people, they can finally find a way to solve them.

But there really is no way to do it about the lift fan.

If you want someone to carry it on your shoulder, you have to have a flat shoulder and a rope.

The problem now is that the flat pole has not been made.

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

And on the other side of him, after listening to all the narrations, Chen Nian's eyes gradually became solemn.

It's really not that 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 the exhaustive method, the difficulty of exhaustive enumeration is definitely not comparable to that of the AGT110 model.

Even with the support of the system, the time savings that can be brought are extremely limited.

Is it really necessary to use the system source again?

It's a bit reluctant

Otherwise, it will only be possible to extrapolate backwards from the data of the F-35.

Thinking of this, Chen Nian opened his mouth and asked:

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

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

"Do you know the F-35B??"

Broken!

Chen Nian reacted suddenly.

This year, the F-35 has not yet made its first flight!

It is at least two years before its information is made public, and now, it is impossible for "ordinary people" like themselves to have access to information related to it! ——

Wait a minute.

I don't know, how do you know?

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

"Hey, hey, hey"

"We do have some F-35B documents and information, but the number is extremely limited and incomplete, if you need it, I will arrange for someone to give it to you."

"Of course, this is top-secret information, and it still needs to go through some necessary procedures, which may delay some time."

"It's okay."

Chen Nian nodded hurriedly and continued to ask:

"Can you tell me first, what information is included?"

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

"Enough!"

Chen Nian nodded with satisfaction.

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

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

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

"I'm going to try to give the overall validation data, which may take a little bit of time, and you can try to solve the engineering problem first."

"Such as materials, mechanical structures, and so on."

"If necessary, a part of private enterprises can be introduced to reduce the pressure on the project."

In the previous life, the research and development of J-20 actually introduced a large number of private enterprises as support, and the 611 Institute actually did a good job in dealing with the balance of confidentiality and efficiency, which is not to be worried about by Chen Nian.

"Understand, you can rest assured about this."

Yang Wei patted his chest and said.

The biggest problem has been solved for you, these corners and corners, do you still have to call it 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 Huaxia's processing capacity at this stage, but as long as there is a way to go, it doesn't matter.

It's a big deal, it's a little bit of grinding on the artificial.

As soon as the validator came out, subsequent standardization was much easier.

The two discussed some details again, and it wasn't until more than twelve o'clock that Chen Nian finally followed Yang Wei to the restaurant.

And the specifications of this reception were true, which also surprised Chen Nian.

It's not that expensive, but in addition to the classic representatives of Sichuan cuisine, there are actually specialties of Chen Nian's hometown.

Although it is not authentic, it can be regarded as giving him a little comfort for 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 Xi'an University of Technology, and his father made them

At the end of the meal, the guests and hosts enjoyed themselves.

In the afternoon, Chen Nian immediately put himself into work, in order to let him get familiar with the environment and work system as soon as possible, Yang Wei personally took him to work.

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

"The software is new, and it's not very familiar to everyone."

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

"Come on, I'll show you how to use this."

"It's okay, I'll use it."

Chen Nian replied with a smile.

What are you kidding, I, who has traveled back from 2022, still don't know how to use CAD and CATIA?

Not only these, but also Nastran, FLUENT, and LS-DYNA, which can also be said to be handy.

After all, this is a guy who eats.

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

Looking at Chen Nian's skillful movements, Yang Wei couldn't help but be stunned.

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

You know, paperless design is not yet popular in this era, and the most typical of them, the original design of J-10, has not completely gotten rid of paper.

Although there is a study of design software in the university courses, it is a basic introduction, and in order to master it, it is necessary to go through a lot of practical operations.

You can see Chen Nian's posture.

Fingers flying, all kinds of shortcuts are familiar with the road, just from the use of the software, it is much stronger than yourself.

This thing can't be explained by "genius".

If you have to describe how you feel at the moment, it's as if there is a soul living in the other person's body that does not belong to this era.

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

"It's good, it's good, you can use it, then I don't have to bother, I'll tell you how to access the database, how to call historical data."

Chen Nian really didn't know this, after all, the permission management system of each research institute was different.

It took more than an hour, and Chen Nian finally understood all the 611 tools clearly, and this speed also made Yang Wei breathtaking.

"Young people are young people, and it took me a month to figure out the system myself."

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

"The tools are easy to learn, and it's hard to know how to use them. By the way, Mr. Yang, I have a request, can you help me take a look? ”

"You say! If you have any requirements, just mention them, and I will try my best to solve them for you! ”

Chen Nian nodded and continued:

"I'm looking for someone."

"Looking for someone? What does it have to do with a lift fan? ”

"Yes, I'm looking for Chen Yunyong from Ye Zha's laboratory - it stands to reason that he is still your junior brother."

"Chen Yunyong?"

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

"I know this person and I've dealt with him."

"However, when I left the Yezha Laboratory of Xi'an University of Technology, he had just entered, so I couldn't talk about how deep my friendship was."

"But I remember, isn't he in the engine business? Can he be used for the lift fan? ”

"Yes."

Chen Nian said affirmatively.

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

His abilities are absolutely unquestionable.

You must know that Shen Fei is not without a thrust fan project, but from the beginning of the project in 1995 to the year he crossed, he did not make a 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 on this project, they paddled too badly.

"Okay, I'll help you find it."

"Still. Seriously, it can be a bit hard. ”

"Difficult? Why? ”

"He's not in the country now, he's in the United States."

"The United States?? Really? Are you sure it's Chen Yunyong?? ”

Chen Nian was shocked.

In his memory, there is no part of Chen Yunyong's trip to the United States, so he always thought that the other party was the same as Yang Wei, and he had always developed in China.

"This is very certain, he went to the United States after graduating from Western University of Technology, and the original plan was to return to China within 3 years, but you also know the situation over there."

"He has never been able to complete the formalities, and he has been stranded for five years now."

"If we have to him, we can try to contact him, but it's very difficult to operate."

"On the one hand, we don't let people go, and on the other hand, we also have confidentiality concerns."

"Understood. Let's try to contact him, anyway, I want to pick him up-—— I can use Shen Fei's name. ”

"A paddling project that doesn't attract attention so easily."

"I understand."

Yang Wei nodded, discussed a few more words with Chen Nian, and left the laboratory.

And Chen Nian, who stayed in place, was a little emotional.

He didn't expect that such a talent at the level of chief engineer would actually experience such difficulties.

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

(End of chapter)