Chapter 955 So...what's the price?
A weekend passes quickly.
November 19th.
Shengjing.
In a conference room in No. 606.
Ian Vista, who had just gotten off the plane, sat at the conference table with a solemn expression, waiting for the meeting to begin.
Although he was deliberately hiding it, he could still see obvious tiredness between his brows.
For someone of Vesta's age, a mere two days' rest before departure is not enough to make up for the fatigue caused by the continuous rotation for the past half month.
Besides, with such a big deal in mind, even if you call it a rest, it’s actually not a good rest at all.
Coupled with the relatively closed environment in the conference room, he even wanted to yawn a little.
However, Vesta knew very well that he could never throw himself into the upcoming talks in this state -
Although it was just a routine work handover, if he felt dizzy, he would definitely have to show up. question.
He bit the tip of his tongue gently, using the pain to wake himself up a little.
However, this alone is obviously not enough.
Vista turned around and looked at several technicians who were also from Snecma.
Including, of course, his deputy, Arthur Mondock.
The latter was currently chatting with Bernard Shore, the technician who called Vista a few days ago, and was obviously trying to understand the recent situation.
After hesitating for a moment, he decided to participate in the conversation to distract himself.
“Bernard.”
As Vesta’s voice sounded, the whispers around him suddenly fell silent:
"I remember you said on the phone before that you were fully involved in their testing process?"
"Hmm..."
Hearing this question, Shore scratched his head in embarrassment. Scratching his head:
“It’s not really participation...”
“Those Chinese scientific researchers are very skilled in cooperating with each other. We don’t have many opportunities to intervene. At most, we just help debug the equipment. Most of the time... I can only watch from the side the whole time..."
Snecma's original intention of sending them to China was to follow the research and development process here and learn something on the way back.
In fact, at the beginning, several people, including Shore, felt good about themselves.
You know, they are all senior in the company.
There are even people who participated in the round of technical cooperation with China in the late 1980s.
Now that I have to be a student to my former students, my mentality is naturally still different.
According to what Shore and others thought at the time, China should have mastered some tricks specific to CFM56 through some kind of coincidence. As long as they learned it, they would be done.
The result...
It has only been two days since the beginning.
Strictly speaking, after attending the technical meeting on the first night, Shore was shocked to find that he could not keep up with the other party's ideas.
He even asked a translator to translate the meeting minutes into English.
But it still doesn't work.
Soon, he realized that what the Chinese people had mastered was not some miraculous skill.
It is an almost entirely new set of aero-engine design concepts.
Learn, kid!
Of course it is impossible to learn it so quickly.
So, this is the situation now.
They only had time to translate the design information provided by the Chinese and send it back to China.
As for the full participation in the design work...
No one has mentioned it for a long time.
Fortunately, Vista is also aware of this actual situation, so it doesn’t make it difficult for Shore:
"It's okay to just stare at the whole process. You should have seen the components they used for testing, right?"
"Of course."
Shore finally breathed a sigh of relief.
After all, it would be a bit embarrassing if you don’t know everything about it:
“The parts they have completed testing include all the turbine disks and turbine blades of the high and low pressure turbines. Of course, the same number Only 4 blades of each type were produced. After all, it was just component-level testing..."
He was interrupted by Vesta when he was halfway through his words:
"A considerable part of the Chinese aviation industry standards are borrowed from ours. Of course I know this process..."
And the voice of these words actually became smaller and smaller as he spoke.
Because at the beginning, Vesta almost instinctively felt that this matter was quite shameless.
But it felt wrong halfway through.
Others borrowed a lot of industry standards from you, but later overtook you...
It doesn't seem like something to be proud of...
"Ahem——"
Vesta had no choice but to cough twice to cover up his embarrassment, and then continued as if nothing happened:
“I want to ask, have you paid attention to the specific design of the cooling system? ?”
These contents can actually be seen after getting the design plan later.
But on the one hand, Vesta is feeling sleepy, and on the other hand, it is impossible for them to believe whatever others say.
There has to be some other information channels as circumstantial evidence, right?
“Noted it.”
Shore replied:
"From a technical perspective, it is still traditional air film cooling, and does not use new technologies such as impact cooling or double-layer walls. However, the internal characteristics of the air film holes are very complex, with non-standard variable cross-sections, and there are Three-dimensional structure..."
"As for the design process, I..." Vesta waved his hand towards Shore:
"You guys, can you It’s enough to get this information.”
“If you haven’t kept up with the design stage, you haven’t kept up...”
He led a team by himself and spent more than 20 days thoroughly understanding the technical information of the M88-2 engine. Naturally, he could not place any higher demands on his subordinates.
However, Xiao shook his head:
“It’s not that we didn’t keep up, but...”
At this point, he paused:< br>
“Yes... we didn’t notice that they had a design process...”
"What?"
Vesta, who was still holding back his tiredness, suddenly stopped feeling sleepy:
"There is no design process?"
"Yes."
Shore explained:
"The special-shaped air film holes they used should have been designed a long time ago. On the M88-3, they just slightly adjusted the arrangement of the hole positions..."
"..."< br>
He obviously wanted to say something more.
But at this time, the door of the conference room was pushed open.
A group of Chinese representatives headed by Liu Yongquan came in one after another from the outside.
"I'm sorry to keep you waiting."
Liu Yongquan took the initiative to step forward and shook Vesta's hand:
"On behalf of China Aerospace Power Group, I welcome our partners! ”
……
After a few non-nutritious and polite greetings, the two parties, who had their own thoughts but the same goal, sat down at both ends of the conference table.
Everyone had a technical document in front of them in two languages - just a brief overview of course.
Detailed technical documents, even if stored on a hard disk, can fill a lockbox the size of a schoolbag.
"Dr. Vesta."
While speaking, Liu Yongquan turned on the projector on the table:
"Now, let me give you a brief introduction to the main design content included in this handover."
The representatives of Snecma on the opposite side immediately cheered up and looked at the meeting with all their eyes. A curtain on the wall on one side of the room.
When no one was paying attention, Liu Yongquan took out the black leather notebook that he had prepared long ago, and under the cover of the projector host, he spread it out in front of him:
"According to the upgrade plan we have agreed on before, the main improvement of the M88-3 engine is the thrust envelope in the range of altitude below 10,000 meters and speed below Mach 0.9..."
"..."
He first gave a general introduction to the expected effects of the upgrade and the current upgrade progress, and then got to the point:
“In order to achieve this without increasing fuel consumption or affecting the cycle life and reliability of the aircraft engine. In order to optimize thrust under the premise, we redesigned the entire hot end of the M88-3 engine, especially the fuel atomization system and the film cooling system to obtain a higher temperature in front of the turbine..."
"..."
While Liu Yongquan was turning the pages of the PPT, Vesta finally asked the question he wanted to ask the most:
"Dr. Liu, we are now the first It’s been less than three months since the upgrade route for the M88-3 engine was finalized, and you can make such drastic adjustments to the hot end?”
Liu Yongquan smiled slightly after hearing this.
He was actually prepared for this problem:
“First of all, during this period of time, we concentrated all our technical strength on upgrading hot-end components, so the progress was relatively fast. "
"After all, the SeA series engines on the Falcon Z project have to share the hot end with the M88-3. The time is tight and the tasks are heavy, and there is no room for any delay."
"In addition, I should have mentioned before that in fact, this cooling system, especially the dustpan-shaped three-dimensional air film holes shown on the PPT, is a mature technology that we have been researching for a long time. As long as it is slightly adapted to the M88-3 engine, With matching, it can meet the technical needs..."
In fact, Liu Yongquan did not tell the truth completely -
The cooling system design of the M88-3 almost completely copied the turbofan 10, but in fact there was no targeted adaptation...
Of course , if you say this, it will be difficult for our friends.
Hearing Liu Yongquan’s explanation, Vista also turned his attention to the curtain again.
Then, his eyes widened instantly.
"This..."
Just like what Shore said just now.
This air film hole design includes gradient cross-section, gradient aperture, three-dimensional structure, internal microstructure of the channel and multi-layer rows, which can be said to have all five poisons.
Although the test data marked below is indeed very eye-catching, Vesta is a little afraid to think about how this thing can be mass-produced by then...
But at this time, Liu Yongquan started to introduce the advantages and cooling principle of this three-dimensional special-shaped hole again, and Vesta was not easy to interrupt.
It wasn't until almost forty minutes later that the whole introduction came to an end, and he finally got a second chance to speak:
"Liu..."
Vista quickly stopped Liu Yongquan from opening the new window. A PPT action:
“I would like to ask... According to your design, there are almost 50 groups of air film holes on a single turbine blade, and the internal structure of each air film hole is like this ...Complicated.”
“Have you considered the issue of production hours?”
Liu Yongquan raised his head, stared at the frowning Vesta and commented for a while.
Then, he let out a vague sigh.
"Alas..."
"Dr. Vesta, we use the most mature air film cooling technology with the smallest air flow loss. Just by optimizing the air film design, we The temperature has increased by about 110K, which is already the limit under the current technical level. "
"If you switch to impact cooling, you can certainly reduce the structural complexity, but it will increase gas loss, affecting about 3%. -5% full envelope thrust, and reliability will also be affected.”
"In comparison, it just consumes more working hours. It shouldn't be an unacceptable price, right?"
(End of this chapter)