Chapter 1020 It was obviously me who came first
Liu Yongquan’s addition stunned both Vesta and Elinor at the same time.
The former is trying to show off but fails to show off, and is simply embarrassed by being slapped in the face——
Replacing the rotor bearing with a non-contact magnetic bearing, although it can indeed increase the effective power, But this part of the effective work cannot be directly converted into thrust.
Generating electricity is almost the only option.
Of course, if I have to say it, with this part of power, the power calibration of the genuine motor can be reduced, which can indeed squeeze out more potential for increased thrust.
But it’s not like what he just explained.
Fortunately, at the moment, no one pays attention to this little detail.
Because the latter did not expect that the question he asked casually as a foreshadowing would lead to such a big and cruel job.
Magnetic bearings are nothing new for Elinor, who is British.
This thing was first researched by Newcastle University.
The actual product is also the first to be launched by S2M, a subsidiary of the British Edwards Group.
Even the technical route of combining magnetic bearings and permanent magnet fault-tolerant motors to build a permanent magnet fault-tolerant power generation system based on H-bridge, although it was pioneered by Lockheed Martin in the JSF project It was publicized, but the concept itself was proposed by British Aerospace, one of the predecessors of BAE Systems.
But what happened?
Why did the French suddenly use it?
Whether it’s a product or a concept, I obviously came first, right?
You must know that the biggest difficulty with this technology is not actually the hardware, but that magnetic bearings are a brand new product and no one knows how to calibrate them——
Although this thing is basically OK It is thought that there is no friction, but if you want to use it to generate electricity, the act of cutting the magnetic coil itself will create resistance.
In fact, in the earliest design concepts, this resistance was even a tool used to efficiently adjust the engine speed.
Truly killing several birds with one stone.
However, the problem is that once there is a problem with the electromagnetic control, it will affect the whole body.
Specifically, fluctuations in power consumption may lead to fluctuations in power generation, which may further lead to resistance fluctuations, which may further lead to speed fluctuations, which may then lead to rotational stalls. The final development is surge...< br>
In short, the permanent magnet fault-tolerant power generation system requires an optimal current control method to achieve fault-tolerant control.
But it has become a huge problem to make the control strategy effective within a fairly wide working range.
The installation and application of the entire set of technologies happens to be stuck here.
Even according to the most optimistic expectations of Lockheed Martin and Pratt & Whitney, JSF will not be able to solve the reliability problem of the permanent magnet fault-tolerant power generation system and install it until 2008.
In fact, few people who know the inside story believe this timetable.
Results.
In Geneva.
In this business aviation show that seems to have no bright spots, someone actually came up with a solution?
"Professor Elinor, the brochure in your hand was modified by us based on the maintenance manual, and the content is actually not very comprehensive..."
Seemingly sensing the other party's doubts, Liu Yongquan directly never knew He took out another booklet that was slightly thinner but had a different cover:
“This is the second edition that was just revised, and some words that are of little significance to non-maintenance personnel have been deleted. Operational details, and added descriptions of several key new technologies on our products... Although it is not too detailed, I think it is enough.”
Elinor’s thinking has not yet fully recovered at this time. He came over, took it in his hand somewhat numbly, and then opened it.
“About page ten is the part about magnetic bearings and permanent magnet fault-tolerant power generation systems...”
Liu Yongquan reminded thoughtfully.
Sure enough, a few pictures and schematics were used to explain the performance of this set of things and its advantages over traditional solutions in just a few words.
It is also specifically noted that in order to ensure reliability, SeA650 is equipped with a mechanical backup at the first support point.
Once the magnetic bearing fails, the rotor bearing that was originally in a non-contact state will enter work.
Of course, it is definitely not a normal state.
But the emergency mode can also ensure that the aircraft engine runs at a lower speed for at least two hours.
In short, from a performance perspective, there are no flaws at all.
But...
As for promotional materials, that’s all.
It is impossible for people to write down the specific design and calibration for you.
So Elinor read it over and over several times, but still felt a little unsatisfied.
But it was impossible for him to ask directly.
The expression on his face was twisted.
During this twisting process, Elinor suddenly realized that he seemed to have a fixed mindset just now.
Content related to magnetic bearings, the Chinese people in front of me have always been communicating with myself.
Dr. Vesta from Snecma was invisible throughout the whole process...
This seems to indicate that at least the magnetic bearing technology should have a greater relationship with the Chinese partners.
Even, it may even be developed by the Chinese. ……
At the same time.
Seeing Elinor's performance, Liu Yongquan couldn't help but smile as if his plan had succeeded——
In fact, after he failed to answer the first question just now, he quickly observed Elinor a detail.
Although the personal information written on the latter's badge was flawless, the ballpoint pen in his hand was the same style as the ones in the pockets of the Rolls-Royce group just now.
So Liu Yongquan reasonably inferred that this Roger Elinor actually came here on behalf of Rolls-Royce.
It’s just a different strategy.
Or maybe it's a red face among red and black faces.
However, Liu Yongquan did not reveal the identity of the other party.
No need.
First of all, the question the other party asked was not a particularly sensitive question.
After Falcon Z is delivered to users, it will be obvious at a glance which technologies you used in which parts.
There is neither the possibility nor the necessity of confidentiality.
Secondly... The relationship between the French and the British is not good, what does it have to do with him as a Chinese?
Aerodynamics and Snecma are partners, that’s right.
But so is the opposite Rolls-Royce!
Ciro Group is still leaving it there.
That's why he chose to take the initiative and directly point out the techniques used.
And he gave Eleanor a copy of the brochure that had just been finalized and only a few copies had been brought, so that he could understand it clearly.
As for you want to know the specific design method...
That's not impossible.
You just have to pay more.
Need to add projects.
Of course, Rolls-Royce has an absolute dominant position in the design and manufacturing of aerospace engines, especially those with large bypass ratios. It may not be that easy to get them to agree to joint research and development.
The next best thing is to be a solution or subsystem supplier.
Not only can we use Rolls-Royce's brand name to make China's aviation products famous.
You can also gain some experience in the research and development of large bypass ratio aviation engines.
More importantly, it can further deepen the close ties between China and Europe in the field of aviation technology.
It is also one of the most effective means of fighting embargoes and sanctions.
Moreover, the highlights in that booklet are far more than that...
Sure enough, after convinced that he could not find any new useful information, Professor Elinor Half reluctant and half curious, I continued to read the following contents.
And soon, his core doubt, that is, where the strange 100°C temperature rise came from, was answered.
"The SeA650 engine uses mature and reliable film cooling technology, combined with a newly developed three-dimensional pore structure and variable interface aperture, to increase the temperature in front of the turbine by 93.7°C without affecting its life..."
" Note that since the internal structure of the three-dimensional hole is more complex than the traditional air film hole, mid-term maintenance must be carried out by a designated supplier..."
"..."
As usual, below the concise description are a few photos and diagrams, as well as a series of test results.
There are not many details, but it can be seen that the cross-section of the air film hole is basket-shaped, rather than the traditional circle, ellipse or fan shape.
This fits exactly with the characteristics previously described by Dr. Norris and Dr. Lapworth.
Of course, the specific design parameters must be different.
But the technical solution...
I’m afraid it’s really the same.
“S……”
Professor Elinor considers himself to be well-educated, but at this time it is inevitable that he would like to use words starting with a certain F or a certain S to exhale fragrance——
Again?
Although he could not guarantee who was the first to study the air film hole, it was no different from the essence of the magnetic bearing just now.
My side blew the whistle on the PPT.
The result was finally realized quietly...
This is a bit embarrassing after all...
(End of this chapter)