"I probably already understand the gas turbine side, and I will find a way to win more support for this project when I go back, but on the aero engine side, which is the main business of Southwest Motor, it seems that your progress is very fast now, and even two years after tomorrow will be completely domestic, right?"

Mr. Wu has always been more concerned about gas turbines, but he is not less concerned about aero engines, and when he saw nearly ten Qingcheng engines on the engine bench of the test center, the expression on his face was excited, and the people who saw it at the scene were all moved.

Qingcheng is Wang Zhengguo's self-recognition of his greatest contribution to the army, and being able to do this project well can be regarded as a wish of being able to do it as a military fan in his previous life.

"It is so, at present, the Qingcheng engine project has been considered nine out of ten, we have invested hundreds of millions of pounds before and after, and finally able to produce our own high-thrust military turbofan engine, and we have also established a good cooperative relationship with Rolls-Royce, and the next cooperation plan is also in preliminary negotiations. ”

Regarding the MPC-75 high-thrust turbofan engine, Southwest Motor has been negotiating with Rolls-Royce, although the German side has been intoxicated with the propeller fan engine, but also does not dare to relax in the field of super-large bypass ratio turbofan, which has Spey project department on the 7-9 ton civilian turbofan proposed by Southwest Motor.

Later, Germany's BMW Aerospace also rushed into the project, after all, this MPC-75 is a project initiated by Germany, BMW Aerospace's positioning in the aviation manufacturing industry in the eighties is very interesting, although the technology is very general, but people do have some capital, this guy has nothing else, just a lot of money.

The Rolls-Roosby project department is responsible for the development of the gas generator, which is the core of the new engine, and will also provide Rolls-Royce's mature large-diameter fan, Southwest Motor is responsible for the development of low-pressure rotor, engine compartment and tail nozzle, and BMW Aerospace is responsible for the development of engine control, starting system and lubricating oil system.

The final assembly line will be established in BMW and Southwest Motor, which will be responsible for the power supply of MPC-75 aircraft produced in the two countries, and if there are other aircraft engine orders, the two production lines will be produced equally.

The above is the cooperation agreement reached by the three parties, the investment ratio is according to 4:3:3, Rolls-Royce Spey project department now has a little funding, plus the new engine is more optimistic about the company's headquarters, so it is also willing to allocate funds to support, which allows Rolls-Royce to get 4 percent of the shares, and the other BMW Aerospace and Southwest Motors each account for 3 percent.

The above news is only the intention and cooperation plan of the preliminary communication between the three parties, and the cooperation news has not yet been made public, and Mr. Wu Zhonghua naturally does not know these things.

So when he heard Wang Zhengguo say that the two companies still have follow-up cooperation plans, he subconsciously thought that he was going to continue to improve and upgrade the Qingcheng engine, which made him a little surprised, after all, if this Qingcheng wants to be changed again, it will really become a standard third-generation high-thrust military turbofan, will Luo Luo have this courage?

"If you want to continue to improve the Qingcheng engine, then where do you plan to start now, I personally feel that it is very difficult to upgrade at present, unless you are willing to overhaul the high-pressure compressor, but this is not realistic. ”

Compared with the Qingcheng engine, it is very good for the Republic to be able to get such an engine now, at least until 2000 will not be considered backward, as for how to upgrade and improve at that time, it is natural to see how far the technology can be accumulated.

At this time, I knew that Old Man Wu was originally concerned about Qingcheng's next stage improvement plan, but in fact, with the current technical level of this thing, China really does not have the ability to make large-scale improvements to it at present.

At least it is impossible to change the structural design of the engine, but in addition to the structural design, AVIC Southwest has other improvement directions to try, which is also where Wang Zhengguo is preparing to start technical research.

"For the current internal structure design of Qingcheng, it is difficult for us to improve it as we want like Rolls-Royce, but now the thrust data is not bad, barely acceptable, the only problem is in the thrust-to-weight ratio, so we still need to continue to reduce the weight of the engine. ”

After all, this engine only has a thrust-to-weight ratio of about 6.5, and this kind of data is still somewhat delayed in the use of third-generation fighters.

To this end, Wang Zhengguo has communicated with Liu Daxiang, chief engineer who is responsible for the domestic project of Qingcheng engine, and the next focus is on the weight reduction of composite materials.

"The initial plan is to replace the entire outer duct casing of the engine with composite materials, and in this regard, GM F-404 engines have been used internationally, and the results are good. More radically, if the technology is mature enough, we also hope to be able to use composite materials for the stator and tail nozzle convergence sheet of the low-pressure compressor. ”

Replacing the non-sports cold-end parts of the engine with lighter weight and lower production cost composite materials is an effective means to solve the problem of low thrust-to-weight ratio of the engine, after all, the engine casing used by Qingcheng is still made of stainless steel materials from the Spey era, and the weight of this guy is really not low.

From the era of stainless steel casing to the era of titanium alloy casing, the weight of the casing is effectively reduced by about 40%, which is a huge breakthrough, and from the era of titanium alloy casing to the era of composite casing, the weight can be reduced by about 30%.

Now Qingcheng's future improvement plan is to evolve directly from the stainless steel casing era to composite materials, during which the weight reduction degree is at least about 100-150kg, if the stator blades and tail nozzle convergence pieces are further replaced, this can at least allow Qingcheng to increase the thrust-to-weight ratio to between 7.2-7.4 without increasing thrust.

As for why Wang Zhengguo is so determined to take the composite weight reduction route, this is mainly because he knows that the Taihang of the upper plane has developed a composite casing for it in the nineties in the nineties, so it stands to reason that this should be regarded as the technology that the upper plane got in the mid-to-late nineties.

So even if he doesn't put pressure on this now, he is still very confident that the domestic aviation materials institute will definitely be able to use mature composite material technology in the nineties.

Of course, this is limited to cold-end composite materials, like those ceramic-based high-temperature composite materials, which will definitely not be available in a short period of time, and can only wait for the future to see the progress of material technology.

After hearing the next plan, the old man subconsciously remembered a certain piece of news he heard a few years ago, and said with some emotion.

"You have chosen the most easily realized technical improvement route, China has indeed made a breakthrough in aviation-grade composite materials, and in this regard, we also want to thank a Japanese friend, without him, we will definitely not be able to break through the relevant technology now." ”