Chapter 158 In the United States?!

Author: September Sauce

Chapter 158 In the United States?!

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 him for a long time. When he saw him get off the bus, he didn't care about anything and first 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 actually 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 I eat spicy food?"

"Exceptionally good."

Chen Nian replied seriously.

"That's good, I'll prepare it for you according to my menu! 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 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 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 what Chen Nian said, Yang Wei sat down calmly and then said:

"Then let's talk about work first."

Entering into the 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."

"In fact, problems such as engines, variable nozzles, and vector nozzles are not too difficult when the material problems have been solved in the early stage."

"But lift fans, we're completely unfamiliar with that."

"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. What we have previously studied are conventional lift fans with a rotor + stator combination. This kind of fan is large in size, has a great impact on the aerodynamic shape of the aircraft, and also restricts the improvement of the aircraft's load-carrying performance. It is not in line with our requirements for the fourth-generation carrier-based

Machine expectations.”

"So, to really achieve our goal, we have to go up a step and go directly into the realm of bipolar 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 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 calculations of the outlet cross-section, pressure ratio, and lift before we can proceed with 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 the ground effect on 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 results."

Having said this, Yang Wei sighed.

Two more difficult points with almost no solutions.

Although many difficulties were encountered during the research and 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 have to shoulder the burden, you 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 made yet.

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

Is it really necessary 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 F-35B documents and information in hand, 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 specific information is included?"

"Rough aerodynamic layout, center of gravity data, design direction, a small amount of body material information, that's it, nothing else."

"enough!"

Chen Nian nodded with satisfaction.

Although it is true as Yang Wei said, this information can be said to be extremely thin, but the most critical data has actually been obtained.
To be continued...