I hadn't heard of such technology on the D-18T engine before, which is really refreshing and maybe a good opportunity.

D-18T is a low-voltage fan stator blade made of carbon fiber reinforced resin-based materials, and then 82 years when this engine has been technically frozen, and put into the flight test work of the flight platform, which can probably guess that Maozi also thought about using composite materials to make fan blades, but because the fan blades made of composite materials are really not strong, so they retreated to the second.

And this is a problem that France could not solve when developing composite fan blades, in the end, resin matrix composites still have inherent performance defects in this regard, even if they are replaced by anyone, they are also not good, so in the end, Maozi can only retreat to the use of composite materials to manufacture fixed stator guide blades without rotation, without high-speed rotation, there is naturally no blade centrifugal force is too large to destroy the performance of the blade.

In 82, the French side was also troubled by this problem, which was not until the early 90s, when it came to the idea of significantly enhancing the mechanical properties of composite blades by adding titanium alloy blade leading edges, which is the best solution that France came up with after a long period of research on this technology.

Soon, when France had not fully figured out this technology, GM started the GE-90 project, so there was a technology license and cooperation, and then the two sides first developed the fan blades on the GE-90, until the new century, the GE-90 engine has only been replaced by a total of three blades among the huge use of customers, which is also a legend.

Now if there is a composite stator blade manufacturing technology of the D-18T engine, if the leading edge of the titanium alloy blade can be added, then the Republic has developed a practical composite fan blade, maybe there are really some possibilities, at least now AVIC Southwest has a fairly good titanium processing capacity, that huge processing base is not a joke.

The current problem is that in 92 years, composite fan blades are still a technology that is not favored, Rolls-Royce's honeycomb titanium alloy fan blades are the artifact sought after by people, and the use of titanium alloy leading edge to enhance the mechanical properties of composite blades, such a method is absolutely still in secrecy, the world's first engine using composite fan blades GE-90 is probably still in the stage of strict secrecy, and the blades collected in a modern art museum in the United States should not have been produced!

It is in this situation that it is even more necessary for Yang Hui to mention that it is time to accelerate domestic research in this area: "Since stator blades of the same size as fan blades can be manufactured, why does D-18T not use composite fan blades, which is really unscientific!" ”

At this time, you must not go straight to the topic as soon as you come, after all, you still have to follow the temptation first, or you will propose a solution as soon as you come, which is not easy to explain, you need to know that Yang Hui has not paid attention to the specific technology of aero engines for a long time, so now it takes a little more effort.

But these are all worth it, just after Chief Wen said the inherent problems of the fan blades made of carbon fiber reinforced resin matrix composites, Yang Hui can finally "fall into contemplation", and then suddenly his brain is opened, and his eyes are bright, like a cloud of enlightenment.

This is simply applauding: "What's so difficult about this, remember our previous "Artillery Reconnaissance-1" UAV, this aircraft suffered from the fact that we did not have a suitable resin matrix composite material at that time, so it was manufactured by ordinary civilian-grade engineering plastic injection molding, but there was also a problem of insufficient structural strength of the fuselage, so we solved the problem by adding a few metal stiffeners in the plastic siding, until now this UAV is still performing well, not only light weight, low cost, but also quite high strength, So I think this kind of thinking can be used as a reference! ”

Not to mention, the composite fan blades with the leading edge of titanium alloy and the engineering plastic body with metal stiffeners used by the "Gungun-1" UAV also have the same effect.

"I see, I can understand that if we make the fan blades according to this idea of adding stiffeners, we can really solve the problem. The most susceptible to damage of composite blades is the leading edge of the blade, if the leading edge of the blade can be made of high-strength metal, all the problems have been solved, and this metal is undoubtedly the titanium alloy we use now is the best. Yes, that's definitely right, and that's the right path for composite fan blades. ”

After getting the answer to the question, Mr. Wen was a little impatient, and he was eager to leave the meeting immediately, ready to preside over the technical verification of this new fan blade configuration, as long as this thing can be successfully manufactured and put into practical use, the domestic super-large bypass ratio turbofan engine will also solve the biggest obstacle. It doesn't seem to be a problem to touch a 30-ton thrust civil aviation engine of Ruida's level in the future.

"Okay, I'm going to go back now to verify this new technical solution, I won't participate in the current meeting for the time being, it just so happens that Chief Engineer Liu can also represent United Aero Engine Company to drive the voting rights, I'm leaving!"

Seeing that this sixty-year-old man was still in such a hurry, Yang Hui still felt very helpless in his heart, about nine years in 83, Yang Hui seemed to be like this when he first arrived at the 011 base.

And several other chief engineers who also participated in the meeting were also envious of Mr. Wen's character, which one of the participants in the meeting at this time did not strive to have a project that he was interested in, and everyone was itching in their hearts.

Feeling that something was wrong with the atmosphere, Yang Hui hurriedly stopped Master Wen, you must not open this head! Only then did he hurriedly throw the next bombshell.

"Are composites just used to make parts for the cold end of an engine? In fact, I think that the blades made of composite materials should be able to expand the scope of use, such as using it to make engine hot end parts, in fact, it can also be a new idea, after all, there are so many types of composite materials, we can always find a composite material that can withstand high temperatures, isn't it? ”

Chief Wen, who was just about to stand up, suddenly sat down again, and suddenly remembered that when Yang Hui mentioned the use of composite materials before, he seemed to have talked about a kind of ceramic matrix composite material to make the tail nozzle of military engines.

Well, there is such a saying. And if it can be used to make the convergence regulator of the tail nozzle, then many other hot end components can also use this material! He finally remembered.

"Regarding ceramic matrix composites, I think this is indeed a good thing that can withstand high temperatures, if so, it should be no problem to use it to manufacture other hot end components of the engine, such as combustion chambers, turbine outer rings, flame stabilizers, vector nozzle adjustment plates, these places should be able to use ceramic matrix composites to replace traditional metal materials, this material can at least achieve a long life of 1300 degrees Celsius high temperature resistance, it can definitely meet the use of these hot end components, And just 1/3 or 1/4 of the weight of conventional nickel-base superalloys, which is of course very promising. ”

Jiang is really old and spicy, and as soon as Master Wen came, he told the approximate range of use of ceramic matrix composites, so that Yang Hui didn't know what else needed to be added, and after thinking about it carefully, he still felt that it was okay to say a few words.

"Yes, the performance of ceramic matrix composites is excellent, it is worth putting it in a very important position now, although we can't use it now, but I'm sure it will be used in the future, our 924 plan is focused on the needs of the next 20 years, I think that time is probably the time for ceramic matrix composites to shine."

Will it take twenty years later? In fact, there is no need, what Yang Hui knows is that the F-119 under development now uses ceramic matrix composite materials to manufacture the tail nozzle, EJ-200 uses it to manufacture the combustion chamber, flame stabilizer, and tail nozzle adjustment piece, and even the M-88 also uses it to manufacture the tail nozzle, and the F-414 uses it to manufacture the combustion chamber, and the future Ruida engine, CFM-56 deep improvement will also be used in the C-919 LEAP and other civilian turbofan engines will also begin to use this material.

In the future after 2015, which Yang Hui knew from the previous face, the Tubi-15 first-class military engines that various countries are preparing to develop are all to use a large number of ceramic matrix composite materials to meet the final weight reduction requirements.

So, the republic of the millennium of ceramic power, the country's English name CHINA is deeply related to ceramics, such a deep historical heritage, if in the field of ceramic matrix composites is still thrown away by foreign countries, this is indeed a little too much.

"Therefore, we not only need to vigorously develop the traditional resin matrix composites, the new generation of ceramic matrix composites can not be relaxed, these two materials will be the most common composite materials used in the field of gas turbines in the future, so Mr. Wen understands how important the project of "advanced composite materials manufacturing and application" you proposed this time? We must grasp this aspect. ”

Mr. Wen, who was sitting in the position, readily agreed: "There is no problem with this, I will definitely catch these two materials, and by the way, I will also cultivate a young composite material manufacturing and processing application team, I am old anyway, this is also the last meaningful thing I did for the aviation field!" (To be continued.) )