Chapter 953 New Air Film Holes on M883

New air film holes on the 88-3

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

Shengjing, 606th Institute of Aviation Power Group.

Liu Yongquan, who has now been promoted to the chief designer and deputy director of the institute, is looking at the summary of the interim problems just submitted by several subordinate design and development teams on the computer.

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

When the latter presided over the project, he would occasionally ask the subordinate design teams to submit the newly discovered problems in the previous stage, or the problems that existed in the past but were not thoroughly understood, and then solve and deal with them separately-

It is not to come up with a conclusion immediately, but to give 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 the project through the system.

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

And Liu Yongquan, as Chang Haonan's deputy, is the one who benefits the most from it.

So after he started to lead the technical research and development work in the institute, he also adopted a similar approach.

However, he soon discovered that although this method, which was close to hand-in-hand teaching, was effective, it required a high level of work intensity for the project leader himself.

As a result, a lot of rest time, which was not sufficient to begin with, was squeezed out.

"This one is done..."

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 think about whether to take a break.

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

"Come in!"

Liu Yongquan felt a little fortunate.

Because he didn't have to worry about it anymore.

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

From the corner of the other party's mouth 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 is 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 is currently in charge of the improvement and development of the M88 and SeA series engines, he was given the job to train.

He can also be said to have seen the world.

Of course, he is called a young man.

In fact, he is already in his early thirties.

He is older than Chang Haonan.

But he is still young in the normal development path of engineers.

"That's right."

Wan Zhonghui nodded and put the folder that had been tucked under his armpit on the desk:

"The test results of the new film cooling design of the M88-3 engine, please take a look."

According to the pie that was drawn for Snecma before, the M88-3 engine must basically reach the performance of the earliest M88-1 model while maintaining its life and reliability.

The top priority is naturally to increase the thrust by 10.5%, reaching a level of about 8.4 tons.

And the simplest and most direct way to increase the 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 core engine with the SeA series engine used by the Falcon Z, especially the shared hot end components, in order to improve the efficiency of research and development, the improvement of the combustion chamber and turbine must be given the highest priority.

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

"I can guess from your appearance that the results must be in line with expectations."

Liu Yongquan said as he pulled the folder in front of him and opened it.

"The mainstream convection heat transfer coefficient is similar to that on the turbofan 10..."

"The pressure drop level is about 10% higher than the previous test... This is determined by the boost characteristics of the M88, so this is the only way..."

"Dynamic viscosity..."

"Reynolds number..."

"..."

He held a ballpoint pen with the pen cap uncapped and quickly browsed 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 turbofan 10.

Although the heat dissipation principle will hardly change due to different engine structures, after all, there is no targeted optimization design, so many performances still show some decline.

Of course, these are all expected.

So Liu Yongquan did not make a fuss.

Until he saw the last item.

"Nussell number along the mainstream..."

He paused involuntarily, and then made a slightly curious sound

"Huh?"

This reaction immediately made Wan Zhonghui, who was full of joy, nervous:

"Mr. Liu, what's wrong?"

"Well..."

Liu Yongquan raised his hand and touched his chin:

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

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

This number is high, but the convective heat dissipation coefficient has not changed significantly, indicating that the conductive heat dissipation is low.

Of course, in the specific environment of aeroengines, the Nusselt coefficient is generally in the double or even triple digits.

So there is almost no difference between the high and low points of conductive heat dissipation.

Even in most cases, designers do not pay special attention to conductive heat dissipation——

The ratio is simply too low.

However, after thinking for a while, Liu Yongquan still pulled off a piece of paper and wrote down this matter.

"What if Chang always comes in handy..."

He thought this while writing a few words quickly.

Wan Zhonghui, who was opposite him, 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 I need to start again..."

Liu Yongquan quickly waved his hand:

"No, the higher one is within the allowable range. Specific to the project at hand, it will not have any qualitative impact on the heat dissipation effect."

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

It is better to leave things like exploring theoretical principles to people who have expertise in this area.

"Then our next step..."

Wan Zhonghui's tense expression relaxed, and his expression turned to joy.

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

But this time, he was at least 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 did component-level testing. As for the effect after installation, that is the task of the French themselves."

"Furthermore, even if we complete the entire testing process, they will definitely have to do it all over again after they return to China."

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

I had no choice but to come to Huaxia this time, but it was impossible to just lie down and become the shopkeeper.

While talking, Liu Yongquan leaned his head, ready to take a look at the calendar placed beside the table.

However, Wan Zhonghui reacted faster and said immediately:

"Today is November 15th, Thursday."

"Um……"

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

"In this case, you go back and rest first."

He said to Wan Zhonghui:

"When will I meet with Snecma's technical representative specifically...I will let you know then."

"good."

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

He also closed the door smoothly.

For this test, he had been spinning for nearly 20 hours. After relaxing for a while, he was indeed a little sleepy.

And the other side.

After confirming that Wan Zhonghui had left, Liu Yongquan immediately grabbed the microphone on the table and made a call to Chang Haonan's office.

It’s very similar to the scene when your mentor is asking his master for help——

The cooling design of the Turbofan 10 is the only part in which Liu Yongquan was not fully involved.

From theory to engineering, Chang Haonan was directly responsible for almost everything.

Although the latter left behind quite complete technical information, Liu Yongquan still inevitably felt a little guilty.

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

At least sit on the scene.

To avoid the dilemma of being unable to answer a question from the other party.

However, after the call was connected, the voice that sounded over there was not Haonan's.

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

"Sorry, Mr. Chang is on a business trip. It's not convenient to answer the phone right now. You can tell me the matter first and let me convey it to you, or you can try calling again 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 see if he could call Chang Haonan's cell phone, but he hesitated for a moment after picking up the receiver, and finally put it down.

If the other party is on a business trip, even if you contact him, it doesn't mean much.

"well……"

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, and almost all of the records are formulas and schematic diagrams.

Obviously, this is a research note.

Judging from the bookmarks and notes that are almost everywhere around him, Liu Yongquan spent a lot of time on this.

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

Of course, I also received help from Chang Haonan during the process...

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

On the one hand, what Chang Haonan left behind was very comprehensive and really helped him a lot.

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

If it doesn't work, just use technical secrets as an excuse to have no comment.

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, November 19th...