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. When he saw him getting off the car, he didn't care about anything and welcomed him into the air-conditioned office.
These days, not all enterprises and institutions have air conditioners, especially military industrial units. Under the influence of some inexplicable thoughts, they always think that they can endure hardships more than others. Therefore, in many relatively backward areas, air conditioners are not really available. Necessities like later.
At least when he was in Institute 601, Chen Nian had never seen a few air conditioners.
But in the 611 factory, almost all indoor spaces are air-conditioned, making the environment much more comfortable than in the 601 factory.
"Sit down, let's have a cup of tea first?"
Yang Wei personally helped pour water for Chen Nian, and then asked his secretary to go down and arrange lunch. His attentive attitude made Chen Nian feel 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 anytime 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 was the one who came first. No matter if I queue up, call or make an appointment with Chen Guo."
"Why did you put me at the end of the queue? Do you think it's pitiful or not?"
Chen Nian smiled helplessly and said:
"Mr. Yang, as you know, I am not necessarily sure about your J-20 project, so I have to focus on things that I am sure about first."
"I understand, I'm just complaining, don't take it seriously. What can I have for lunch?"
Yang Wei quickly changed the topic.
In fact, he is not particularly good at dealing with people. For example, just now, what he actually wanted to express was that he valued Chen Nian, but as soon as he said it, his taste changed a bit, and it sounded like he was complaining.
"Uh, just eat something?"
"Can you eat spicy food?"
"Exceptionally capable."
Chen Nian replied seriously.
"That's good. I'll prepare my menu for you! I'll take you to see the dormitory first. It's specially set aside and is right next to me."
Saying that, Yang Wei stood up, and Chen Nian quickly stopped him:
"Mr. Yang, don't worry, let's talk about work first. I have a good idea."
In fact, although Chen Nian had already 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, exit diversion, incoming flow combing, etc.
In the previous life, NPU had a cascade laboratory that specifically sorted out these problems. It spent a lot of time and jointly tackled the problem with multiple countries before finally solving it.
At that time, international units participating in the project included VITAL, Roscosmos, German DLR, SNECMA, 606, Liyang Aviation Development, etc. The latest genetic algorithm was even introduced in the process, which shows how difficult these problems are.
On the other hand, it also reflects the strong technological strength of the United States.
Therefore, when Yang Wei raised this question, Chen Nian immediately felt a pressure.
It’s really not that simple if we just rely on our own strength to solve it.
After hearing Chen Nian's words, Yang Wei sat down calmly, and then said:
"Then let's talk about work first."
Entering into a rhythm he was familiar with, his temperament also changed. His confidence in technique gave him a 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."
“Issues such as engines, variable nozzles, and vector nozzles are actually not too difficult if the material issues have been solved in the early stage.”
"But lift fans, that's completely new to us."
"This technical step is very steep. If we want to climb up, we can't even find a place to step on."
"The reason is very simple. We have previously studied conventional lift fans with a rotor + stator combination. This type of fan is large in size and interferes greatly with the aerodynamic shape of the aircraft. It also restricts the improvement of the aircraft's load-carrying performance and is not in line with our requirements for the fourth-generation carrier-based Machine expectations.”
"So, to really get there, we have to go a step up and go directly into the realm of counter-rotating fans."
“I won’t go into details about the various issues involved. Let’s talk about the first difficulty we are currently encountering.”
"That's the problem of the total pressure ratio of the lift fan."
"We must theoretically verify the feasibility of a single large-diameter fan through calculations of the outlet cross-section, pressure 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 do not have data on the loss caused by ground effect in response to lift, nor do we have reference data on the total pressure ratio."
"This makes our calculations like headless flies. Even if we use the traversal method, it is difficult to get the result."
At this point, Yang Wei sighed.
Two more difficult points with almost no solutions.
Although many difficulties were encountered during the development of the J-20A, there are basically solutions to those difficulties. As long as we spend more time based on mature theories, even if it is someone shouldering the burden, we can finally figure it out. Solution.
But there is really nothing we can do about the lift fan.
If you want someone to carry it on your shoulders, you must have a shoulder pole and a rope.
The problem now is that the carrying pole has not been built yet.
The reason why I called Chen Nian over was to see if he could make this pole.
Opposite him, after listening to all the narration, Chen Nian's eyes gradually became solemn.
This problem is 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, on this issue, the difficulty of exhaustive analysis is definitely not comparable to that of the AGT110 model.
Even with system support, the time savings it can bring are extremely limited.
Do we really need to use the system source point again?
I really can’t bear to part with it.
Otherwise, we can only use the F-35 data to infer.
Thinking of this, Chen Nian asked:
"Mr. Yang, do you have any information about the F-35B here? The more detailed the better!"
Yang Wei's eyes suddenly widened and he asked in disbelief:
"Do you know the F-35B??"
broken!
Chen Nian suddenly reacted.
These days, the F-35 has not yet made its first flight!
It will be at least two years before its information is made public, and now, for "ordinary people" like myself, it is impossible to have access to 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 in tacit understanding.
"Hey Hey"
"We do have some documents and information on the F-35B, but the quantity 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 doesn't matter."
Chen Nian nodded quickly and continued to ask:
"Can you tell me first what information it specifically includes?"
"Rough aerodynamic layout, center of gravity data, design direction, a small part of the body material information, that's it, nothing else."
"enough!"
Chen Nian nodded with satisfaction.
Although it is indeed the same as what Yang Wei said, this information can be said to be extremely thin, but the most critical data has been obtained.
That means that based on the known take-off weight of his previous life, Chen Nian can roughly deduce the lift that the lift fan needs to provide.
With this point in mind, 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. This may take a while. You can try to solve the engineering problems first."
"Such as materials, mechanical structures, etc."
"If necessary, some private enterprises can be introduced to reduce the project pressure."
In the previous life, the research and development of the J-20 actually attracted a large number of private enterprises as support. 611 actually did a good job in balancing confidentiality and efficiency. Chen Nian did not need to worry about this.
"I understand, don't worry about this."
Yang Wei patted his chest and said.
The biggest problem has been solved for you. Do you still find it difficult to solve these minor problems?
Although the mechanical structure is not simple, especially the manufacturing of the transmission system, it can almost be said to challenge the limits of China's processing capabilities at this stage, but as long as there is a way to go, it doesn't matter.
No big deal, just have to manually grind it bit by bit.
Once the verification machine comes out, subsequent standardization will be much easier.
The two discussed some details, and it wasn't until after twelve o'clock that Chen Nian finally followed Yang Wei to the restaurant with unfinished business.
The specifications of this reception really surprised Chen Nian.
It’s not expensive, but in addition to classic Sichuan cuisine, there are also specialties from Chen Nian’s hometown.
Although it is not authentic, it still gives him some comfort as a wanderer who has been in a foreign land for a long time.
After all, the last time he ate these dishes was when his parents were arranged to travel to NPU.
After the meal, the guests and hosts enjoyed themselves.
In the afternoon, Chen Nian immediately threw himself into work. In order to familiarize him with the environment and work system as soon as possible, Yang Wei personally took charge of him.
"We are now all using paperless design, which means that the design work has jumped from two-dimensional to three-dimensional."
"These softwares are all new and not everyone is very familiar with them yet."
"However, once you get used to it, both efficiency and confidentiality will be greatly improved, so I think it's worth it."
"Here, let me teach you how to use this."
"It's okay, I can use it."
Chen Nian smiled and replied.
Are you kidding me? As a person who traveled back in time from 2022, how can I still not know how to use CAD and CATIA?
Not only these, but also the later Nastran, FLUENT, and LS-DYNA, he can 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 but be 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 is that the original design of Jianshi did not completely get rid of paper.
Although there is learning about design software in university courses, they are all basic introductions. If you want to be proficient in it, you must go through a lot of practical operations.
Look at Chen Nian's attitude.
Fingers are flying, and all kinds of shortcut keys are familiar. In terms of using the software, it is much better than myself.
This thing cannot be explained by "genius".
If I had to describe how I felt at this moment, it was as if there was a soul that didn't belong to this era living in the other person's body.
He stared blankly for a few seconds, then finally came back to his senses and said:
"Very good, very good. If you know how to use it, then I won't bother you. I'll 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's authority management system is different.
It took more than an hour for Chen Nian to finally understand all the 611 tools, and the speed amazed Yang Wei.
"Young people are young people. They learn so fast. It took me a month to figure out this system."
Chen Nian didn't speak, just smiled and said:
"The tools are easy to learn, but how to use them is hard to come by. By the way, Mr. Yang, I have a request, can you help me?"
"Say it! If you have any requests, 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 Yizha Laboratory - logically speaking, he is still your junior brother."
"Chen Yunyong?"
Yang Wei repeated it subconsciously, and after thinking for a moment, he answered:
"I know this person and have dealt with him before."
"However, when I left the Blade Laboratory of NPU, he had just entered, so we couldn't say we had a deep friendship."
"But I remember, isn't he an engine developer? Can he be used for the lift fan?"
"It will come in handy."
Chen Nian said affirmatively.
He clearly remembered that later, around 2015, it was Chen Yunyong who led Chengdu Aircraft's thrust fan project and achieved breakthrough progress in just two years.
There is absolutely no doubt about his ability.
You know, Shen Fei did not have a thrust fan project, but from the establishment of the project in 1995 until the year he traveled through time, it did not make any 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 event, they were paddling too hard.
"Okay, I'll help you find it."
"But...seriously, it might be a little difficult."
"Difficult? Why?"
"He is not in the country now, but in the United States."
"America?? Real or fake? Are you sure it's Chen Yunyong??"
Chen Nian was shocked.
There was no time in his memory when Chen Yunyong went to the United States, 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 NPU. His original plan was to return to China within three years, but you also know the situation there."
"His procedures have never been completed. So far, he has been detained for five years."
"If we absolutely need him, we can try to contact him, but it's very difficult to do so."
"On the one hand, they won't release people there, and on the other hand, we also have confidentiality concerns."
"I understand. Let's try to contact him. In short, we have to bring him back no matter what - we can use Shen Fei's name."
"A paddling event is not so easy to attract attention."
"I see."
Yang Wei nodded, discussed with Chen Nian for a few more words, and then left the laboratory.
Chen Nian, who stayed where he was, felt a little emotional.
He didn't expect that such a master-level talent would experience such difficulties.
I don’t know how many scientists like him are forced to stay there.
(End of chapter)
