Originally promised Lu Yuying to do active stability control and surge prediction for J-10, in fact, it was before the Spring Festival this year, but because of the frequent occurrence of various accidents after the year, Chang Haonan has not been able to fulfill his promise.

Moreover, since Lu Yuying did not actually participate in the No. 10 project, this matter has not started until now, and it is necessary to communicate with Song Wencong or Xue Chiyu, who are really in charge of the No. 10 project.

Of course, with Chang Haonan's current popularity and influence, there is no need for Du Yishan to do this kind of thing as a year ago.

After the meeting, he quickly dialed the number of the 611 office.

Of course, it was impossible for the operator on the other side to decide such an important matter, so after explaining his identity and intentions, the phone was transferred several times before a young male voice rang again in the earpiece:

"Chang Gong, you are a busy person, you can be regarded as remembering to contact us."

"If it weren't for the fact that Mr. Lu met you in Yan Liang before and mentioned this matter, we would have thought that you would release the pigeon."

Chang Haonan quickly heard the identity of the person who answered the phone.

Deputy Chief Designer of Project No. 10, Yang Wei.

When he first saw the J-10 that had entered the final assembly state at the Rongcheng 132 Factory, the two had a relationship.

"How can it? I've always been a man of my word, but there have been too many things to do during this time, and I can't get out of it. ”

Faced with the other party's half-joking ridicule, Chang Haonan also chose a more relaxed way to respond,

"It's not like I just got free, and the first thing I thought of was what I promised you, so I quickly made a phone call."

In the past two months, a series of turmoil caused by Chang Haonan has basically shaken the entire system of the Science and Technology Commission, and Yang Wei, as the deputy chief engineer of the project, naturally cannot be ignorant, so he didn't really have any dissatisfaction just now, just a few jokes between acquaintances.

That's right, although the two have only met once, and the conversation time is no more than five minutes, but in Yang Wei's heart, Chang Haonan has already been classified as an "acquaintance".

For a super genius like him, the depth of friendship is not mainly determined by how long they have known each other, but by seeking a spiritual and capable fit.

It just so happens that Chang Haonan is one of the few people who can meet his requirements.

Moreover, although the age difference between the two is more than ten years, it is not to the extent that they are separated by a generation, and it is easier to get along.

"It's okay, just remember us, now that the No. 01 prototype of Project 10 has been assembled, we are in the process of inspecting the whole aircraft system, and preparing for a series of ground tests before the first flight, which is the time when you need to play your strengths and help delineate the test and flight conditions."

Obviously, the progress of Project No. 10 during this period of time was fast, and Song Wencong and Yang Wei had even arranged Chang Haonan's position.

Just wait for him to pass and then start work.

Only this time, I'm afraid it won't be as they want right away.

Chang Haonan directly pointed out the meaning:

"Yang Gong, I'm afraid that the matter of determining the test conditions has to be put on the back burner, and I contacted you today because I have a new idea that can greatly improve the stability of aero engines."

"Aerodynamic instability control of Hangfa?"

Yang Wei over there was stunned for a moment after hearing Chang Haonan's answer,

"But in this regard, we have made some restrictions in the flight controller......"

As a third-generation fighter with all-digital fly-by-wire, the J-10 naturally considered the potential safety hazards caused by the failure of a single-engine aircraft engine at the beginning of its design, so it is not unprepared in this regard.

But halfway through the words, Yang Wei's voice gradually became quieter.

Without it, the person who brought up a "new idea" on the phone was Chang Haonan after all......

Although he had not worked with the latter before, Yang Wei had basically heard of the name of the person, the shadow of the tree, and all kinds of deeds about this young genius.

In short, it should not be the traditional aero engine instability control strategy that can make such a person make a special call to contact him.

But more specific things can't be talked about on the phone.

So he changed his mind:

"That's it, the technical details, I'm afraid it's difficult to make it clear on the phone, I'll arrange a business trip to the capital as soon as possible, listen to your ideas, how about it?"

This reflects the change in Chang Haonan's status now.

Aside a year ago, in this case, it was only possible that he flew over to find someone else, how could it be possible for the deputy chief designer of the family to make a special trip for one of his ideas?

But now, Yang Wei made this decision almost naturally.

Of course, this is not Chang Haonan's intention, but the supercomputer performance of the school's new supercomputer is really good, and 611 does not have the same level of equipment......

All in all, it's really fragrant!

……

As a top engineer, Yang Wei is naturally very efficient, and after only two days, he arranged his work in Rongcheng and came to Beijing Airlines accompanied by several entourage.

The two met in a conference room that Tang Lintian had already arranged with a high degree of secrecy.

"Chang Gong, it's a pleasure to meet you again."

"Me too."

The two exchanged a few words of greeting and went straight to the point.

"So...... I will introduce the relevant ideas about the active control of compressor instability. ”

Chang Haonan opened the laptop on the table, as well as the projector not far away.

Then a blank screen appeared on the curtain hanging on the wall—

That's right, after a year, he used the old version of office to make a PPT.

Before being reborn, if Chang Haonan was asked to make a list of the things he hated the most, then he would definitely be in the top five for PPT.

But after returning to 1997, Chang Haonan thought about it, but found that there was really nothing that could replace the role of PPT in this kind of occasion.

Because with a large number of diagrams, handwriting will only be more work, and it is not as intuitive as PPT.

"According to some of my personal understanding, at present, the internationally advanced aero engine instability control strategy is based on the instability control line."

As Chang Haonan clicked the mouse, a diagram of the engine working curve appeared on the curtain.

"Because the instability boundary has a high degree of uncertainty, will be affected by many factors such as flight attitude, environmental factors, aging of engine parts, etc., in order to ensure that the engine always works in the safety range, so in the engine control system design stage to determine a fixed boundary, that is, the instability control line, this line considers the loss of stability margin in the worst working environment of the engine, can ensure that the engine is far away from the aerodynamic instability."

"When the pilot judges that the aircraft is at risk of aerodynamic instability, or when the sensor detects that the engine has crossed the instability control line and alerts the pilot, a short-term stabilization system can be manually activated to keep the engine working away from the instability line within the specified time by reducing the amount of fuel supply, adjusting the bleed valve, adjusting the area of the guide and nozzle."

When this picture was released and after listening to Chang Haonan's summary in just two sentences, Yang Wei knew that his trip would not be in vain.

Because as soon as the other party came up, he completely said that their current plan was right.

He nodded:

"That's right, this is the instability recovery control system that we are going to apply to the J-10, of course, we still need to cooperate with the Rurika Design Bureau that provides power to improve the aircraft's full-authority digital electronic control (FADEC) system, which should also be the most cutting-edge stability control technology currently used in foreign countries for the third and a half generation fighters."

"If you compare the situation in the past, it is indeed very cutting-edge."

After hearing Yang Wei's answer, Chang Haonan showed a smile:

"However, it is not cutting-edge enough."

(End of chapter)