As a result, the compressor wheels made of deformed titanium alloy and the casing made of titanium alloy are bound to cause friction.

The friction between the high-speed compressor and the casing will definitely produce heat, and the thermal conductivity of the titanium alloy itself is not very good, and the friction area where the heat is concentrated.

At the same time of friction, titanium alloy particles will be rubbed out, and the temperature of the friction zone itself is high, and then the particles will be rubbed out, and they will burn at once, so the F404, the engine that has been promised high hopes by the United States, spontaneously combusted.

Starting from the high-pressure compressor, and then burning through the casing, the flames continued to drift out and began to burn the titanium alloy casing of the outer duct, then the entire engine, and even the entire aircraft, which is the reason for the spontaneous combustion of F404 and F101.

It was only after the Gulf War that GM discovered the problem, and the method adopted was to change the high-pressure compressor casing to M152 alloy steel and the outer duct casing to PMR15 composite material.

Since the F404 this time, foreign countries have crossed out the titanium alloy option in the engine casing material, even if individual engines still use titanium alloy casing, measures have also been taken to prevent direct friction between titanium and titanium, and the stator blades are completely no longer made of titanium alloy.

Before the F404, many engines in the world used titanium alloy casings, but after the nineties, the problem was found, and the titanium alloy was no longer blindly worshipped.

These are all problems that have only been discovered in long-term use, and if there are no problems that erupt from the F404's continuous use test for many years, who knows that there will be such hidden dangers.

So, an aero engine doesn't just find a lot of problems in the development phase. There are also a variety of problems that arise after it is put into use, and it is not too a new engine. This is true for Americans who are stronger, not to mention the Republic's aircraft engines and industries that are not as technologically advanced as those of the United States.

Of course. Now F404 is still alive and well, after all, it is not yet 87 years, 624 Institute will definitely not notice this problem, Yang Hui now does not plan to F404 engine core engine design flaws out, just a sentence of the current domestic titanium alloy processing technology is not good, it can completely block the mouth of the 624 Institute.

In Yang Hui's plan, like the design of the high-pressure gas casing of the F404 engine, it is necessary to make a good article, and you need to know the core machine used in the F404 engine: GE9. It's everywhere.

Such as the F404, F101, as well as the F110 that has just been finalized, the best-selling naval marine gas turbine LM2500, and even more terrifying is the commercial engine CFM56 engine that also uses this core engine.

If Yang Hui said that there were major design flaws in this core aircraft, the series of engines on it might burn out, resulting in the destruction of the aircraft, especially the FCM56 engine, which was widely used in the eighties, was installed on so many civil airliners and could crash at any time.

Yang Hui didn't believe that General Motors was not in a hurry. If you wait until the U.S. Navy's F18 falls one or two in 87, Yang Hui will reveal some news to the U.S. Navy, think about the situation

In this case, Yang Hui said that he could take this opportunity to knock on GM. By the way, you can also pull out some good things, and in 87 it was the sweetest time for the Republic and the United States. Anything is possible, to die for the bold, to starve for the faint-hearted.

When the time comes, put the news on the international level. There was no shortage of aero-engine manufacturers who made the same mistakes as GM at that time.

That's it. It can completely start the signboard of Southwest Science and Industry, and it is also well-known in the world. With such a good thing of fame and fortune, without cost and risk, Yang Hui could not let it go.

Now we only need to point out the right way for this core machine pre-research project, which is still a little too early to be exposed, and we need to brew it again. Let the GE9 core machine seize more markets.

The 624 institutes were sent away, and the combustion chamber project team in the institute also took away more than half, leaving two people to use when dealing with urgent matters.

At the same time, such a long time has passed, it is already the beginning of 86, and the new year will have a new good atmosphere, and the news from Hongdu has completely detonated the excitement in Yang Hui's heart.

There is no other reason, the base and Hongdu jointly developed the new training aircraft nine to test flight, this should be called K8 of the world's famous aircraft, under Yang Hui's butterfly wings, is also on the fast track in advance, the first flight day is five years faster than the previous plane.

The previous life was in 87 years before the formal research began, now it's different, in 83 research and development entered the fast lane, but also got Yang Hui's cheating bonus, 86 early test flight is not surprising at all, after all, this is just a junior and intermediate training aircraft, too simple.

"Okay, the first flight is going to be in twenty days, are you going to have a thrill before the New Year? In this way, since it is more exciting, I will give you more weight, and I will call the big customers of this aircraft to watch the first flight at that time. ”

It has been almost a year since the last contact with the Egyptian side at the Feanborough Air Show, and the administrative efficiency of Egypt is very low, and it has lazily spent more than a year studying whether it is necessary to introduce a junior and intermediate training aircraft under development.

Fortunately, no matter how slow the efficiency is, not long ago, I was also contacted through Xie Lianfa's China Aviation Administration Development Import and Export Company, saying that the reason was discussed in depth and in detail, which made Xie Lianfa excited.

And what everyone doesn't know is that this guy in Egypt is not kind at all, while contacting AVIC Zhengkai Technology Import and Export Company, he also secretly contacted AVIC, which seems to be preparing to fiercely reduce the price, so that AVIC and AVIC Zhengkai Technology two technology import and export companies compete with each other, and he Egypt will reap the benefits of the fisherman.

And AVIC's response is even more confidential, and now everyone still doesn't know, because the top management of AVIC has issued a gag order, and they are silently preparing, for this kind of big project, how can AVIC not care.

These are other things, now Yang Hui is talking to Hongdu on the phone, K8 chief designer Shi Ping heard Yang Hui's response, he was excited and didn't know what to say, this infant aircraft finally has a buyer, what a big news this is.

"Who asked for our plane? Who is it? Tell me about it, it's true."

These words were a little incoherent, and Yang Hui didn't sell more guanzi, so he said who the buyer was.

"The buyer is only interested in it now, but if it happens, it will definitely be a very large order, and we can almost recover 50% of the investment in this order."

Yang Hui's words are really not bragging, what Egypt wants is to introduce technology and establish a production line in Egypt, which is not an ordinary big order, and even involves helping Egypt establish part of the foundation of the aviation industry, which is all money.

The stone screen on the other side didn't care so much, and immediately slapped the table vigorously: "Okay, Egypt, it's him." You can call the Egyptian team with confidence, and I will immediately start arranging, re-checking the design, and we must make sure that this first flight is foolproof, and this business must not be lost. ”

didn't wait for Yang Hui to answer again, he had already hung up the phone heavily, and rushed out immediately, he had to report the good news first, and then he had to prepare.

Hearing the beep on the phone, Yang Hui smiled helplessly, this Chief Shi seems to be a little too excited, so there won't be a problem, right? Shaking his head, he dialed the phone again to Xie Lianfa, who was far away in the imperial capital.

"Hey, Lianfa, I'm Yang Hui, what you said about Egypt last month, how did you talk about it? Now that our trainer is about to make its first flight, we are ready to invite the Egyptian side to the maiden ceremony. (To be continued......)