The development of the turbofan 21 engine, because it takes a few months earlier, and there is the second generation of core engine technology, the design progress is very fast, no, before the turbofan 25 design technical outline comes out, the design of many important and key parts has been completed.

The design of the fan part is completed first!

Fan blades, fan discs, fan shafts, etc., basically follow the second-generation core machine, and the amount of changes is not large, and a large part of the parts of the fan are made of "Hercules" materials.

For example, fan blades, the blade design is still a wide chord fan blade, but the material is no longer titanium alloy, but "Hercules" material, compared with titanium alloy wide chord fan blades, the strength is higher, the weight is lighter, and the aerodynamic performance is better.

The same goes for the fan casing, all of which are made of "Hercules" material, such a fan casing, compared with the titanium alloy casing, the manufacturing difficulty is greatly reduced, the manufacturing process is greatly enhanced, the weight is almost half lighter, and the strength is doubled.

The design drawings of these parts have been sent to Li Tianfeng's office, and the design drawings of the important and key parts of the turbofan 21 engine, Li Tianfeng has set the rules and must be sent over for Li Tianfeng himself to review.

The beautiful design of the fan blades, the excellent aerodynamic performance, and the exquisite design of the fan casing are Li Tianfeng's evaluation of these designs.

Two months have passed quickly!

When the time came to November, the design of the turbofan 21 engine was basically completed, and the design of several important and key components was basically completed, and many of them were new designs, reflecting a high level of design.

For example, the compressor of the turbofan 21 engine, the compressor has 6 stages, although the number of stages is the same as that of some aero engines, but the performance of the compressor is not the same. The design structure is also very different.

The same 6-stage compressor has a much higher compression efficiency than an ordinary aero engine, and has very good aerodynamic performance and excellent surge margin.

And the weight of the compressor is only less than half of the weight of the general aero engine compressor, because many parts and materials of the turbofan 21 engine compressor are made of "Hercules" force. And it's a brand new design.

New monolithic blade disc design!

That is, the compressor blades and the compressor disc are integrated, a whole, a six-stage compressor, six integral blade discs, using "Hercules" material, six integral blade discs are installed together, which constitutes the main body of the compressor.

Such a design not only has a good manufacturing process, but also excellent aerodynamic performance. In addition, the assembly is very simple, and the manufacturing cost is greatly reduced.

In November, the comprehensive design of the turbofan 21 engine came to an end, and the design technical outline of the turbofan 25 engine was also freshly released.

Now, this design technical outline led by Sun Xiaoping has been completed and has been placed on Li Tianfeng's desk.

Turbofan 25 engine. Twin-rotor small-bypass turbofan engine with vector nozzle. Both the vector and the thrust are controlled by a digital electronic system.

The new generation of full-functional, full-authority digital electronic control system is more advanced and leading than the electronic control system of turbofan 16, turbofan 17 and turbofan 18 series engines.

Turbofan 21 engine design features, fan 2 stage. Compressor 6 stages, new high-load and high-efficiency combustion chamber, single-stage low-pressure turbine, afterburner combustion chamber, etc

The engine thrust-to-weight ratio is 15, and the maximum thrust is 165KN (about 36000 lbs). The 1-0-1 high-pressure rotor support method is adopted, and the structure of the engine is simple, with few parts and light weight.

The design technical outline not only clarifies the design parameters and performance of each part of the engine, but also has a design diagram.

After Li Tianfeng read this design technical outline, it took him three days, if he just read it from beginning to end, half an hour is enough, but Li Tianfeng is not just reading it once.

He did not personally write this design technical outline, Li Tianfeng naturally had to be very careful and serious, some performance parameters, Li Tianfeng himself had to scrutinize, calculate, some unreasonable places, Li Tianfeng had to correct them one by one, improve and so on.

Overall, this design technical outline is very good and very level, but Li Tianfeng still revised it to make it more excellent and excellent.

In three days, this design and technical outline after Li Tianfeng's "major surgery", there was basically no problem, and after the inspection, Li Tianfeng called Sun Xiaoping and Qiu Wenan, the two principal and deputy chief model designers.

After opening a small stove, giving some guidance, and "face-to-face teaching", Sun Xiaoping and Qiu Wenan happily walked out of Li Tianfeng's office with this design technical outline.

The two talked as they walked towards the R&D center.

Sun Xiaoping said: "Old classmate, I thought that there should be basically no problem with this design outline, and basically fully reflected our level. ”

Qiu Wen'an said: "Yes, but after such a modification, the future turbofan 25 engine will be even more excellent, whether it is reliability, maintainability, manufacturing cost, or overall performance, it is excellent, and it can completely surpass the F119 engine." ”

Sun Xiaoping said slightly excitedly: "Old classmate, I didn't think that we were so fortunate to be able to lead the development of such an advanced and excellent engine, and I am still a little excited until now." ”

Qiu Wen'an said: "Yes, how lucky we are, since we entered Tianfeng Technology Company, our fate has taken a big turn, I can't imagine it." The successful development of this engine will leave the names of you and me in the history of the aviation industry of the Republic. ”

Leave the names of the two!

Sun Xiaoping was even more excited in his heart, Sun Xiaoping said: "What we can do is to work hard, and now I deeply understand what it means to be 'a soldier dies for a confidant'!" ”

……

Two days later, this revised version of the turbofan 25 design technical outline was sent to Li Tianfeng's desk, Li Tianfeng read it carefully, and felt that there was basically no problem, Li Tianfeng dialed Zhang Haiping's phone.

Zhang Haiping is one of the main leaders of the military for the turbofan 25 engine project and Li Tianfeng's main liaison.

As soon as the phone rang, Li Tianfeng said: "Director Zhang, there is something to report to you." ”

Zhang Haiping said: "Mr. Li, what to report or not, we don't need to be polite between us, is it the design and technical outline of the turbofan 25 engine that has come out?" ”

Li Tianfeng said: "Minister Zhang, you are really like a god. ”

Zhang Haiping soon became interested: he said happily: "Really, great!" In this way, I will personally come to Tianfeng Technology Company tomorrow. ”

Li Tianfeng was slightly surprised, and did not think that Zhang Haiping personally came to Tianfeng Technology Company, which shows how much the military attaches importance to the turbofan 25 engine.

Li Tianfeng said happily: "Director Zhang, then I will sweep the bed and welcome your arrival." ”

Zhang Haiping laughed.........

………

Li Tianfeng didn't think about it, Zhang Haiping hadn't come yet, but Yang Xianfeng came to the door in person.

Yang Xianfeng and Liu Qingshan came to Tianfeng Technology Company in person, and when they received Liu Wei's report, Li Tianfeng had just finished talking to Zhang Haiping on the phone.

Liu Wei said: "Boss, Mr. Yang and Mr. Liu from Factory E are here and want to see you, so I will arrange for them to be in the reception room next to it."

Li Tianfeng was stunned for a moment, and then said happily: "Mr. Yang and Mr. Liu are both my old friends, I'll go over now." ”

At the same time, Li Tianfeng thought in his heart, the two of them came over in person, obviously it couldn't be a private matter, it must be a public matter, if it was a private matter, the two of them could find themselves privately, drink with themselves, chat, and explain all private matters clearly.

If it's business, what kind of business is it?

Li Tianfeng put a big question mark in his mind, and walked quickly into the reception room not far from the next door, as soon as he entered the door, Li Tianfeng was full of smiles and looked very enthusiastic.

In the reception room, the two were drinking tea, and when they saw Li Tianfeng coming in, they hurriedly put down the teacup and stood up together.

Now, Yang Xianfeng is the chairman and general manager of Plant E, a veritable leader, and Liu Qingshan is the chief engineer of Plant E.

Li Tianfeng said enthusiastically: "Mr. Yang, Mr. Liu, rare guests, you rarely come to me!" ”

Yang Xianfeng said: "Mr. Li, excuse me, we are here on the liberty, but there is no way, we think about it for a long time, think about it, and only you can help us." ”

Li Tianfeng motioned for the two to sit down, Li Tianfeng himself sat down, Li Tianfeng said: "Mr. Yang, it seems that you are in trouble?" ”

Yang Xianfeng said: "We really have encountered a lot of difficulties, we need you to help us, otherwise, it will be really difficult for us to get through this difficulty." ”

Li Tianfeng said: "Mr. Yang, the problem of business operation? ”

Yang Xianfeng said: "Sort of, when Duan Hongjiu worked in Plant E before, he left a lot of messes, one of which was the gas power generation project he engaged, which invested a lot of money, but as a result, the gas turbine generator did not sell a few, but the funds were invested hundreds of millions, and we are now stretched." ”

Li Tianfeng nodded and said very happily: "Mr. Yang, if you want to borrow money, there is no problem, hundreds of millions of funds, our Tianfeng Technology Company can easily take it out." ”

Yang Xianfeng was grateful for a while, and then said: "Mr. Li, we have basically solved the problem of funds, and we have borrowed 300 million yuan from the bank, which is basically not a problem." ”

There is no problem at all in finding a bank loan of 300 million or 500 million yuan, you must know that the E factory was once very brilliant and was a key construction project during the first five-year plan period of the country.

It's just that over the years, especially since the market economy, it has gradually gone downhill, and now it is even more dependent on loans to get by.

Li Tianfeng said: "Mr. Yang, since it is not a problem of funds, it must be other problems, don't worry, since Mr. Yang has opened his mouth, as long as we can help, we will do our best." ”

Li Tianfeng had a very good attitude, he didn't ask about any difficulties first, but first expressed his intention to help, Yang Xianfeng and Liu Qingshan glanced at Li Tianfeng gratefully.

…………

Today's three watches, the third one is sent! (To be continued......)