The military-industrial scientific research system of the academic master.

Almost at the same time when Chang Haonan and others took back the four Tu-160 strategic bombers.

Shengjing, No. 606 Institute of Aviation Power Group.

Liu Yongquan, who has now been promoted to the position of chief designer and deputy director of the institute, is currently sitting in front of his computer, reviewing the summary of interim issues just submitted by several of his subordinate design and development teams.

This is a habit he learned from Chang Haonan when he was involved in the WS-10 project.

When the latter is in charge of a project, he will occasionally ask the subordinate design teams to submit new problems discovered in the previous stage, or problems that existed in the past but are not fully understood, and then solve and deal with them separately.

It does not mean to come to a conclusion immediately, but to provide guidance on the direction of the next stage of work.

In fact, this is exactly the way the system guides Chang Haonan when he carries out projects through the system.

Therefore, the improvement in the participants' abilities is almost immediate.

As Chang Haonan's deputy, Liu Yongquan was the person who benefited the most from it.

So after I started to take charge of the institute's technical research and development work, I also adopted a similar approach.

However, he soon discovered that although this approach, which was close to hands-on teaching, was effective, it required a high level of skill and work intensity from the project leader himself.

The result is that the rest time, which was not sufficient to begin with, was squeezed out even more.

"This one is also finished..."

Liu Yongquan muttered to himself while moving the mouse, clicking the Save button on the screen, and then closing the document:

"Then... there are only two left."

He glanced at the time in the lower right corner of the computer and began to wonder whether he should take a break.

Just at this moment, there was a knock on the door outside the office.

"Enter!"

Liu Yongquan felt somewhat fortunate.

Because you don’t have to worry about it anymore.

The door opened and a technician in blue work clothes walked in hurriedly.

Judging from the other person's lips that couldn't be suppressed at all, it was not difficult to judge that there should be good news.

"Xiao Wan, have you finished the test?"

The man was called Wan Zhonghui, a young man that Chang Haonan had discovered from the grassroots level of the WS-10 project team.

Considering that Liu Yongquan was currently in charge of the improvement and research and development of the M88 and SeA series engines, he was handed over for training.

It also allows me to see the world.

Of course, we are talking about young people.

In fact, I am already in my early thirties.

Older than Chang Haonan.

I'm just still young in the normal development path of engineers.

"Yes."

Wan Zhonghui nodded and put the folder he had been holding under his arm on the desk:

"Please review the test results of the new film cooling design of the M88-3 engine."

According to the promise previously made to Snecma, the M88-3 engine was to basically reach the performance of the earliest M88-1 model while maintaining its lifespan and reliability.

The top priority is naturally to increase the thrust by 10.5% to about 8.4 tons.

The simplest and most direct way to increase thrust is naturally to increase the temperature before the turbine.

Of course, in addition to this, there are a series of upgrades such as reducing the weight of the casing, increasing the boost ratio, and reducing fuel consumption.

However, considering that the M88-3 will share the same core engine as the SeA series engines used by the Falcon Z, especially the shared hot end components, in order to improve R&D efficiency, improvements to the combustion chamber and turbine must be given top priority.

The test report in front of them is a preliminary examination of the results of their work over the past few months.

"I can guess from your looks that the result will definitely be in line with expectations."

As Liu Yongquan spoke, he pulled the folder in front of him and opened it.

"The convective heat transfer coefficient along the mainstream is similar to that on the WS-10..."

"The voltage drop level is about 10% higher than the previous test... This is determined by the boost characteristics of M88. This is the only way for now..."

"dynamic viscosity……"

"Reynolds number..."

"..."

He held an uncapped ballpoint pen and quickly scanned the contents of the test report line by line.

According to Chang Haonan's requirements, the design of the cooling air film holes in the turbine part of the M88-3 was almost completely copied from the WS-10.

Although the heat dissipation principle hardly changes due to different engine structures, it has not undergone targeted optimization design, so many performance issues have declined.

Of course, this was all expected.

Therefore, Liu Yongquan did not make a fuss.

Until you see the last item.

"The Nusselt number along the mainstream..."

He paused involuntarily, then made a slightly curious sound.

"Ok?"

This reaction immediately made Wan Zhonghui, who was looking happy, nervous:

"Mr. Liu, what's wrong?"

"Well……."

Liu Yongquan raised his hand and touched his chin:

"This Nusselt coefficient seems a bit high..."

The Nusselt coefficient is the ratio of convective heat to conductive heat.

This figure is on the high side, but the convection heat dissipation coefficient has not changed significantly, indicating that the conduction heat dissipation is on the low side.

Of course, specifically in the context of aero engines, the Nusselt coefficient is generally in the double or even triple digits.

So there will be almost no difference between high and low points of conduction cooling.

Even in most cases, designers don’t pay special attention to the conduction heat dissipation.

The proportion is really too low.

However, after thinking about it for a while, Liu Yongquan tore off a piece of note paper and wrote down this matter specifically.

"What if Mr. Chang is useful..."

He thought this as he wrote down a few words quickly.

Wan Zhonghui on the other side didn't know what Liu Yongquan was thinking. He only saw that the latter had specially written a note, so he became even more nervous:

"Then...do we need to start over..."

Liu Yongquan quickly waved his hand:

"Not really. It's still within the permissible range. Specifically for the project at hand, it won't have any qualitative impact on the heat dissipation effect."

As a technician with an engineering background, Liu Yongquan has a relatively clear understanding of his abilities.

It is better to leave the exploration of theoretical principles to people who have expertise in this area.

"Then our next step..."

Wan Zhonghui's tense expression relaxed and his face turned into joy.

During the WS-10 project, he could only be considered a participant at best.

And this time, at least I was responsible for a small part of the work.

Although not the core content.

But at least it's a good start.

“The natural next step was to hand over the new turbine design to Snecma.”

Liu Yongquan replied with a smile:

"After all, we only conducted component-level testing. As for the effect after installation, that is the French's own task."

"Besides, even if we complete the entire testing process, they will definitely have to do it all over again after returning home."

After all, the French are not Indians, and they always have dreams.

I had to come to China this time because I had no choice, but I couldn't just sit back and do nothing.

As he spoke, Liu Yongquan leaned over and prepared to take a look at the desk calendar on the table.

However, Wan Zhonghui reacted faster and said immediately:

"Today is November 11th, Thursday."

"Um……"

Liu Yongquan leaned back in his chair and pondered for a moment:

"Well, go back and have a rest first."

He said to Wan Zhonghui:

"Exactly when to meet with Snecma's technical representative... I'll let you know then."

"it is good."

Wan Zhonghui didn't doubt it, just nodded, turned around and walked out of the office.

He even closed the door.

He had been working non-stop for nearly 20 hours for this test, and he felt a little sleepy when he just relaxed.

And the other side.

After making sure Wan Zhonghui had left, Liu Yongquan immediately grabbed the microphone on the table and called Chang Haonan's office.

It's very much like the scene when your mentor asks his master for help.

The cooling design of the WS-10 was the only part in which Liu Yongquan did not participate in the entire process.

From theory to engineering, almost everything was directly completed by Chang Haonan.

Although the latter left behind fairly complete technical information, Liu Yongquan still couldn't help feeling a little guilty.

Therefore, he hoped that Chang Haonan could communicate with the technical staff at Snecma.

At least he was there.

This is to avoid the embarrassing situation where the other person asks a question and you are completely clueless about the answer.

However, after the call was connected, the voice that came from the other end was not Haonan's.

According to the line settings, when the group leader does not answer the call, it will be automatically transferred to the corresponding office head, that is, Zhang Liangping.

"I'm sorry, Mr. Chang is on a business trip and can't answer the phone right now. You can tell me what happened first and I'll pass it on, or you can call me back another day..."

"I'm sorry, Comrade Liu, I don't have the right to reveal Mr. Chang's specific itinerary..."

"..."

After hanging up the phone, Liu Yongquan sighed helplessly.

He originally wanted to try to call Chang Haonan's cell phone, but after picking up the receiver, he hesitated for a moment and finally put it down.

If the other party is on a business trip, then even if you contact him, it will be meaningless.

"Ugh……"

Liu Yongquan sighed and took out a black leather notebook from the bottom drawer of his desk.

"You still have to rely on yourself..."

He muttered something under his breath.

At the same time, the notebook was opened to a page in the middle.

It is densely packed with formulas and schematic diagrams.

Clearly, this is a research notebook.

Judging from the bookmarks and notes that are almost everywhere, Liu Yongquan has put a lot of effort into this.

In fact, this is exactly what he concluded from technical documents on cooling design.

Of course, Chang Haonan also helped me a lot during the process...

Looking at the contents on the notebook, Liu Yongquan's somewhat uneasy heart finally calmed down a lot.

On the one hand, what Chang Haonan left behind was very comprehensive and was indeed of great help to him.

On the other hand...the other party is a partner after all, not a superior.

If it really doesn't work, just say "no comment" on the grounds that the technology is a secret.

After figuring this out, Liu Yongquan calmed down, took out a red ballpoint pen from the side, and marked the word "meeting" on the calendar page for next Monday, which was November 11th...