The Military-industrial Scientific Research System of the Academic Master Chapter 1018

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 guessed casually:

"Perhaps it's some new insulation coating they've developed?"

However, Professor Elinor just blew his beard and glared:

"That's ridiculous!"

He reached out and flicked the information hard, making a crisp snapping sound:

"Have you ever seen any coating that can increase heat resistance by 100°C in one go?"

"If there is such a thing, why should we study those alloy materials and active cooling technology?"

Facing the furious old professor, Norris also realized that his idea just now was a bit outrageous:

"Then...it is also possible that there are some hidden dangers that have not been resolved before M88-2, so in order to ensure reliability, the temperature in front of the turbine has been specially reduced."

"The problem was 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 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 models M88-1 and M88-2. The difference is not big.”

At this time, the situation was a bit frozen.

"Forget it, go back to the office first, I have to take a good look at this thing..."

After some fruitless thinking, 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...

Anyway, it smells really good…

Soon, the two arrived at the office on the top floor of the headquarters.

Elinor 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's just a technical manual.

Liu Yongquan handed over almost all the technical information to Snecma, but he only had to teach it 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 Dassault's, but it's impossible to see through everything based on just an ambiguous piece of information.

Moreover, there are only a few ways to increase the temperature in front of the vortex.

Most of them are unlikely to bring about 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. It is impossible to It can be dealt with in a few months.

Then there's 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 results.

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.

But 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 may even be possible to completely offset the increase in thrust brought about by the increase in temperature in front of the turbine...

However, the thrust performance of SeA650 is quite normal, and it does not seem like it has lost a lot of power gas...

Anyway, it's stuck.

Instead, Norris, who had been sitting on the sofa and thinking, suddenly had a flash of inspiration:

"Professor, I suddenly remembered that Dr. Lapworth mentioned a research result before. By modifying the internal channel design of the air film hole, the temperature resistance performance can be improved by about 80-100℃..." Liya · Lapworth, director of computational science at Rolls-Royce and 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've never heard of it before?"

As an extremely mature technology, it is normal for the effect of air film cooling to improve as the research becomes more in-depth.

But to improve so much at once...it's a little mind-boggling.

And if such results really come out, the impact should be considerable.

Norris shrugged:

“Because technology is being put on hold.”

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 softly:

"Originally, it was planned to be used on the Trent 900 engine, which could reduce fuel consumption by about 5.5%, thus defeating the GP7200... But after the technology was actually implemented, it was discovered that the complexity of both design and manufacturing was too high... "

Both the Trent 900 and the GP7200 are intended to power the Airbus A380, a superjumbo currently under development.

As usual, 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.

Therefore, 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…"

Norris was speechless.

Obviously, Elinor's logic is sound.

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 here...the SeA650 will be displayed as a 1:1 restored full-size model at the European Business Aviation Show in Geneva next week."

After a quick glance, he raised his head and looked at Norris:

"Hurry up and book your tickets. Let's go to Switzerland next week..."

"Ah?"

The latter's face showed a moment of confusion.

At first, he just wanted to find 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 your tickets!"

Looking at Norris who had no reaction, Elinor stretched out his hand and knocked on the table for emphasis:

“There's probably something we…uh…and of course you need over there!”

(End of chapter)

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