Chapter 953 New air film hole on M88-3
At almost the same time that Chang Haonan and others took back the four Tu-160 strategic bombers.
Shengjing, the 606th Research Institute of the Aerospace Power Group.
Liu Yongquan, who has now been promoted to the chief designer and deputy director of the institute, is currently looking at the computer to review the summary of phased issues that have just been submitted by several design and development teams under him.
This is a habit he borrowed from Chang Haonan when he participated in the Turbofan 10 project.
When presiding over a project, the latter will occasionally ask its subordinate design teams to submit problems that were newly discovered in the previous stage or that existed in the past but are still not fully understood, and then solve and handle them respectively.
It does not mean to come up with a conclusion right away, but to give guidance on the direction of the next stage of work.
In fact, this is exactly how the system guided Chang Haonan when he carried out projects through the system.
Hence, the improvement of participants’ abilities is almost immediate.
As Chang Haonan’s deputy, Liu Yongquan was the one who benefited the most from it.
So after I started to take charge of the technical research and development work in the institute, I also adopted similar methods.
However, he soon discovered that although this approach, which was close to hands-on teaching, was effective, it required high standards and work intensity for the project leaders themselves.
As a result, a lot of rest time, which was not sufficient in the first place, was taken up.
“I’ve finished this one too…”
Liu Yongquan muttered to himself, moved the mouse, clicked the save button on the screen, and then closed the document:
“Then...there are only the last two copies left.”
He glanced at the time in the lower right corner of the computer and began to think about whether he should take a break.
?At this moment, there was a sudden knock on the door outside the office.
"Enter!"
Liu Yongquan felt a little lucky.
Because you don’t have to worry about it anymore.
?The door opened, and a technician in blue overalls walked in hurriedly.
Judging from the other party’s irresistible expression, it’s not difficult to tell that there should be good news.
“Xiao Wan, have you finished the test?”
The visitor’s name is Wan Zhonghui, a young man who Chang Haonan had previously tapped from the grassroots level of the Turbofan 10 project team.
Considering that Liu Yongquan is currently responsible for the improvement and development of the M88 and SeA series engines, he was given the responsibility to train him.
It can also be regarded as a way to see the world.
Of course, it’s young people.
Actually, he is already in his early thirties.
She is older than Chang Haonan.
Just relatively young on the normal development path of an engineer.
“That’s right.”
?Wan Zhonghui nodded and put the folder he had been holding under his arm on his desk:
“You can take a look at the test results of the new film cooling design of the M88-3 engine.”
?According to the pie drawn for Snecma before, the M88-3 engine should basically reach the performance of the earliest M88-1 model while maintaining the same lifespan and reliability.
The top priority is naturally to increase the thrust by 10.5% to a level of about 8.4 tons.
The simplest and most direct way to increase thrust is to increase the temperature in front of the turbine.
?Of course, in addition to this, there are also a series of upgrades such as reducing the weight of the receiver, increasing the boost ratio, and reducing fuel consumption.
However, considering that the M88-3 will share the same core engine with the SeA series engine used by the Falcon Z, especially the shared hot-end components, in order to improve research and development efficiency, the improvement of the combustion chamber and turbine must be given the highest priority.
The test report in front of them is a preliminary test of the results of their work over the past few months.
“I think you can guess it like this, and the result must be in line with expectations.”
As Liu Yongquan spoke, he pulled the folder in front of him and opened it.
“The convection heat transfer coefficient along the main stream is similar to that on the turbofan 10..."
“The voltage drop level is about 10% higher than the previous test... This is determined by the boost characteristics of M88, and this can only be done..."
“Kinematic viscosity…”
“Reynolds number…”
…”
? He ??held a ballpoint pen with the cap unopened and quickly scanned the contents of the test report line by line.
?According to Chang Haonan''s requirements, the cooling film hole design of the M88-3 turbine part almost completely copied the turbofan 10.
Although the heat dissipation principle will hardly change due to different engine structures, after all, there has not been targeted optimization design, so many performances have still declined.
Of course, these are all expected.
So Liu Yongquan did not make a fuss.
Until you see the last item.
“The Nusselt number along the main stream…”
??The movements of his hands paused involuntarily, and then he made a slightly curious sound.
"Um?"
?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 to be a bit high...”
? Nusselt coefficient is the ratio of convective heat to conductive heat.
This number is on the high side, but the convection heat dissipation coefficient does not change significantly, indicating that the conductive heat dissipation is on the low side.
?Of course, in the context of aerospace engineering, the Nusselt coefficient is generally at the two- or even three-digit level.
So there is almost no difference between high and low conductive heat dissipation.
Even in most cases, designers do not pay special attention to conductive heat dissipation—
The ratio is really too low.
?However, after thinking for a while, Liu Yongquan still pulled off a piece of paper and wrote down this matter.?????"What if it''s always useful..."
?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 you need to re-…?”
Liu Yongquan quickly waved his hand:
“No, the higher temperature 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 field.
“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.
This time, he was at least responsible for a small part of the work.
Although it is 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.”
??The French are not Indians after all, they always have dreams.
??This time I came to Hua Xia out of necessity, but it was impossible to just lie down and become the shopkeeper.
As he spoke, 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 Thursday, November 15th.”
"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 conveniently.
For this test, he had been running continuously 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 is very similar to the scene when your mentor is asking the master for help——
The cooling design of Turbofan 10 is the only part that Liu Yongquan was not fully involved in.
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.
Hence, he hoped that Chang Haonan could communicate with the technical staff at Snecma.
At least sit on the spot.
To avoid the dilemma of the other party asking a question and being unable to answer it.
However, after the call was connected, the voice that sounded over there was not very Haonan''s voice.
?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 and it’s not convenient to answer the phone right now. You can tell me the matter first and I will convey it to you, or you can try calling 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 them, 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 quietly.
At the same time, the notebook was opened to a page in the middle.
The above 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 in 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 is very comprehensive, and it is indeed of great help to him.
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 thinking about this, 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...
(End of this chapter)