Chapter 1018. Black technology prepared for A380?
Sharing the core engine means that the high-pressure compressor, combustion chamber and turbine are basically the same.
Of course, if the same core machine is in different working environments or has been upgraded, it is normal for the operating temperature to be somewhat different.
But the problem is that the difference between M88-2 and SeA650 is less than a year.
As for 100℃, the temperature in front of the turbine is almost half a generation away.
Although it cannot be said that the higher the temperature in front of the turbine, the better the engine performance will be, but the correlation is indeed relatively strong.
So there must be something wrong here.
However, by this time, Norris had not fully realized the seriousness of the matter, and just casually guessed:
“Perhaps they have developed some new thermal insulation coating? ”
However, Professor Elinor just blew his beard and glared:
"It's ridiculous!"
He stretched out his hand and flicked the information hard, making a crisp snapping sound:
"Have you ever seen any coating that can withstand it in one go?" The thermal capacity is increased by 100°C? "
"If there is such a thing, why should we study those alloy materials and active cooling technology?"
Faced with the furious old professor? , Norris also realized that his idea just now was a bit outrageous:
"Then...it is also possible that there were some hidden dangers that were not solved before the M88-2, so in order to ensure reliability, the temperature in front of the turbine was specially lowered."
"The problem has been solved on the SeA650...or Because the working environment of the passenger aircraft engine is relatively mild, the problem no longer exists, and the original design was restored..."
This explanation is obviously much more reasonable than the previous one.
Even Elinor lowered his head and pondered, seeming to be somewhat convinced.
But after about half a minute, he still shook his head:
"The M88 did reduce its working performance to ensure stability, but this was mainly a problem with the compressor. I knew some of the parameters of its prototype back then. The combustion chamber outlet temperature... followed by the two M88-1 and M88-2 The difference in model is not big.”
Now, the situation is a bit frozen.
"Forget it, let's go back to the office first. I have to take a good look at this thing..."
After some thought to no avail, Professor Elinor took another step.
I completely forgot that I almost said "I don't think this thing is of much use" less than five minutes ago...
In short, it smells really good...
...
Soon, the two came to the office on the top floor of the headquarters.
Eleanor took off his suit jacket, and without even having time to make a cup of coffee, he hurriedly sat back behind the desk and reopened the information in his hands to study.
But...
No clues were found.
After all, it is just a technical manual.
Liu Yongquan handed over almost all the technical information to Snecma, but he only needed to teach him step by step. The latter had not yet fully grasped the design theory of the M88-3 engine.
Rolls-Royce's level is certainly higher than that of Dassault, but it is impossible to see through everything based on just a piece of ambiguous information.
Moreover, there are only a few ways to increase the temperature in front of the vortex.
Most of them are unlikely to bring 100°C room for improvement.
Although the effect of replacing the turbine base material is obvious, the base material affects the whole body, affecting not only the high temperature resistance, but also other mechanical properties. It is almost necessary to recalculate the combustion chamber and turbine parts. Once again, it is impossible to handle it in a few months.
Then there is the new active cooling technology.
For example, when film cooling was first applied, it raised the temperature in front of the turbine to a whole new level.
If the new impact cooling technology is put into use, it can probably achieve similar effects.
It will not affect the basic design of the engine itself, so the workload is relatively limited and it is not an exaggeration to complete it within one year.
The problem is that neither France nor China seems to have conducted in-depth research in this area.
In addition, impingement cooling requires 10% or even a larger proportion of the air provided by the compressor to be used for cooling rather than propulsion, which in principle will lead to huge thrust losses.
It is even possible to completely offset the increase in thrust caused by the increase in temperature in front of the turbine...
However, the thrust performance of the SeA650 is quite normal, and it does not seem like a large amount of power gas has been lost...
Anyway, it's stuck.
On the contrary, Norris, who had been sitting on the sofa thinking, suddenly had a flash of inspiration:
"Professor, I suddenly remembered that Dr. Lapworth mentioned it before According to a research result, the temperature resistance performance of about 80-100°C can be improved by modifying the internal channel design of the air film hole..." Leah Lapworth, Computational Science at Rolls-Royce Director, who is also the head of the Computational Science Laboratory.
In addition to being responsible for connecting with various ongoing project teams and completing their computing needs, this laboratory is also responsible for certain cutting-edge technology research and development tasks.
"Is there such a thing?"
Elinor sat up straight at that time:
"But...I have never heard of it before?"
Air film Cooling is an extremely mature technology, and it is normal for its effects to improve as research becomes more in-depth.
But to improve so much at once...it's a bit unbelievable.
And if such results really come out, the impact should be considerable.
Norris shrugged:
“Because the technology has been shelved.”
Hearing this answer, Elinor was very surprised:
“ Why? ”
Although the basic principles of air film cooling and impact cooling are similar, the former uses cooling air relatively normally and basically does not have particularly fatal flaws.
Norris sighed lightly:
“It was originally planned to be used in the Trent 900 engine, which can reduce fuel consumption by about 5.5%, so that it can beat the GP7200... But the real technology After implementation, I discovered that the complexity of both design and manufacturing is too high..."
The Trent 900 and GP7200 are both prepared for the super giant that is under development - the Airbus A380. motivation.
According to convention, both models will be included in the A380 supplier list as options to avoid putting eggs in one basket.
Having said that, if any model is significantly better than the other, users are not stupid and will definitely prefer the option with better performance.
In order to simplify logistics, many airlines will try to unify the engine brands in their fleets as much as possible.
So, if we can win the competition with the GP7200, the benefits will be more than just one or two thousand engines for hundreds of A380s...
"So ..."
Professor Elinor was silent for a while, and then slowly said:
"If SeA650 can guarantee delivery time and delivery volume, it means that the French... uh... or the Chinese people are very likely to have mastered the technology you mentioned... or similar technology?"
This question made Norris unable to react for a while.
After being stunned for a moment, he realized that the other party had already accepted his speculation.
This time it made him feel less confident.
"No...Professor, I'm just speculating. I'm not saying they must..."
But before he finished speaking, he was interrupted by Elinor:
“But at least for now, there is no other possibility, right?”
“Hiss...”
< br>Norris was speechless.
Obviously, Elinor’s logic is correct.
When all other possibilities are eliminated, the last remaining one can only be regarded as the correct answer for the time being.
Elinor closed the brochure in his hand and turned it to the back cover.
“I see what is written on it is...SeA650 will be displayed as a 1:1 restored full-size model at the European Business Aviation Show in Geneva next week.”
He scanned After a quick glance, he raised his head and looked at Norris:
"Hurry up and book a ticket. We will go to Switzerland next week..."
"Ah?"
The latter's face showed a moment of confusion.
At first, he just wanted to ask Professor Elinor to analyze this booklet. Why did he suddenly have to go on a business trip in the end?
“Don’t be stunned, go and book a ticket!”
Looking at Norris who had no reaction, Eleanor reached out and knocked on the table for emphasis:
"It's very likely that we have things over there...uh...including what you need, of course!"
(End of this chapter)