"In this case, let the 6O3 Institute carry the aerodynamic exploration project of the flying wing layout, which is also calculated in the cutting-edge aerodynamic exploration project, what do you think?"

Almost as if it had already been decided, the meeting quickly agreed on a project on the aerodynamic exploration of flying wings. ≧≥ then came a variety of other requests, everyone wanted to put forward a plan that they thought was suitable and promising, and intended to take this opportunity to complete a variety of promising and difficult projects, so that their unit could have the core technology from now on.

It was at this time that the older generation of Chief Wen sent by the United Aviation Motor Company also tepidly raised some technical problems that did not belong to the previous "Gaotui Pre-research 2" project, and these are also urgent to be solved, which is related to the future of the fourth-generation fighter project.

"Since we are going to prepare for the fourth-generation fighter project, and we have already carried out preliminary research work on aerodynamics, is it also necessary to carry out targeted research on the key technologies of the next generation of military high-thrust turbofan motors? At least with our current level of technology, it is still roughly at the level of the third-generation turbofan engine, and we still need a lot of effort to reach the level of the F-119 engine. ”

Chief Master Li opened the topic, and then other people also put forward their own ideas, and Chief Master Song shouted: "That's right, we need to let the development of motivation go to the front of the aircraft project, and now that the aircraft has begun the research work on aerodynamics, then the motivation must not lag behind." We also need a 17-ton high-thrust turbofan motor, a small duct, low fuel consumption, a high thrust ratio, reliability, and vector thrust, which are the hard power indicators required by the fourth-generation fighter, and now we need to work hard for it. ”

After Chief Engineer Song put forward various requirements like a cannon, the other 6 General Managers and General Yu also raised their hands in agreement, which made Chief Engineer Wen of United Aviation Motor Company said that he was very pressured, and these requirements need to be done with all kinds of money and time!

Touching his head, Chief Engineer Wen and Chief Engineer Liu of the 624 Institute on the side smiled bitterly at each other, and then said with difficulty: "We are clear about the above technologies, but it is not easy to solve them at all, let's just say that the high thrust-to-weight ratio required this time, and now our turbofan 12 is only the design level of the thrust-to-weight ratio of 8, in order to achieve the thrust-to-weight ratio of F-119 1o, this not only requires the motivation to increase the push, but also needs to reduce the weight of the motive, and this weight reduction design has a lot worth saying." ”

Motioning to the next to the chief engineer who was responsible for the research of the aviation motor core machine, Liu said first, and Liu chief engineer was naturally unceremonious: "In order to reduce the weight of the motor, we have focused on following up the compressor size blade technology in the "high push pre-research 2" project, if we can use the two-stage size blade design in the high-pressure compressor, we are expected to control the high-pressure compressor to 6 or even 5 levels, if we can do this, it may be of great benefit to the weight and volume of the core machine. ”

intends to use the large and small blade technology on the new generation of high-push core machine, this is the news that Yang Hui has known for a long time, so there is nothing to be surprised about.

So, I listened quietly

Chief Engineer Liu also continued, "And because before that, in order to prevent the friction between titanium and titanium from spontaneous combustion, we used a bulky steel casing on the core of the push, which is not cost-effective, so this time we arranged the research on the flame-retardant titanium alloy high-pressure casing in the pre-research, and finally to meet the requirements of using the new flame-retardant titanium alloy to manufacture the high-pressure compressor casing, so that we can effectively control the weight of the core machine." ”

This time only two technologies were proposed, but Yang Hui believes that if these two technologies can be successful, then the weight and volume control of the core machine will be of great help, but Yang Hui also deeply knows how difficult the technology of these two projects is, and he himself may still have some bottom on the technology of large and small blades, and about the development of flame retardant titanium alloy materials, Yang Hui is all kinds of unsteady, and this feeling has not appeared for a long time.

However, since Chief Engineer Liu was able to put forward these two technologies, and listed them as the key technologies of the "High Push Pre-research 2" project, it should still be worth believing, and 10,000 steps back, even if the flame retardant titanium alloy technology is not mature, it must be normal, these are often encountered in engineering projects, if a huge and complex project does not encounter some setbacks, it is really strange.

"I understand that although these two technologies are only two-fifths of them in the high-push pre-research project, they are definitely quite important, and what I can guarantee is that in the high-push pre-research project, the funds will never be broken halfway, which you should rest assured, as long as the technology can be made, it is the best answer."

Subsequently, the topic turned back to Chief Wen, just now let Chief Engineer Liu first talk about the efforts on the core machine project, so now in addition to the core machine of the cold end components, afterburner and tail nozzle, how to achieve weight reduction, probably this is also the thoughts of everyone attending the meeting.

"Master Wen, then the cold end parts are intended"

"In terms of cold-end components, we can design a one-stage conventional low-pressure fan and a one-stage blade fan, so that our new motor will adopt an unprecedented two-stage low-pressure fan design, which can also bring a good weight reduction effect to the motor, and at the same time achieve the miraculous effect of shortening the length of the motor, and finally our new generation of big push can be designed into a 2+6 fan and compressor design, which will also be a height that the F-119 cannot reach."

Sure enough, Yang Hui knew that after opening the Pandora's box of large and small blades, the development of aviation motors would definitely usher in a series of chemical reactions, first of all, the length and size control of this motive must have passed the 3+6 scheme of F-119, and such a storage zài is really exciting, fortunately, the technology of large and small blades seems to be born just later than the technical scheme of F-119 in the previous face, so F-119 is no time to enjoy such good things, And this is probably the rear advantage.

Of course, what Yang Hui didn't say in his heart was that if the army of this plane still insisted on choosing the 611 duck scheme, presumably under the huge size and weight requirements of that fighter, the new motive was only to achieve the 17.7 tons of thrust like the F-119, I'm afraid it was not enough!

At that time, the motivation to meet the 611 plan can probably only reach 18 or 19 tons, if the army really puts forward such a requirement, then under the same small bypass ratio requirements, I am afraid it will not be an ordinary 2 + 6 compressor type can be satisfied, maybe at that time there will be 3 + 7 or 2 + 7, 3 + 6 compressor design scheme is possible, and this will be returned to the same compressor level as 119.

But in any case, as long as the size of the blade technology can be completed on time, then AVIC Southwest's large thrust in the whole machine thrust-to-weight ratio will definitely not be less than 9.5 this level, in terms of size it must be able to reach the world's advanced level, this must be the Maozi storage zài, and if there are some other weight reduction designs, if you want the American standard thrust ratio 1o can still be achieved.

And this so-called other weight reduction design seems to involve the focus of Mr. Wen this time: "In addition, we also need to vigorously develop composite material technology, and the outer duct casing of the cold end parts will be made of composite materials, which will also be a key project for me to declare this time." (To be continued.) )8