The development of the turbofan 21 engine is a few months in the morning and the second generation of core engine technology has made the design progress very fast. Before the outline of the turbofan 25 design technology came out, many important and key parts have been designed.

The fan part design is the first to complete!

Fan blades, fan disks, fan shafts, etc. basically use the second-generation core machine, and the amount of modification is not large. A large part of the parts of the fan are made of "Hercules" materials.

For example, fan blades, the blade shape is still a wide-string fan blade, but the material is no longer titanium alloy, but a "Hercules" material. Compared with titanium alloy wide-string fan blades, it has higher strength, lighter mass, and better aerodynamic performance.

The same is true for fan receivers, all of which are made of "Hercules" materials. Compared with titanium alloy receivers, such fan receivers are much less difficult to manufacture, greatly enhanced manufacturing processability, almost half of the weight, and double the strength.

The design drawings of these parts have been sent to Li Tianfeng's office. The design drawings of important and key parts of the turbofan 21 engine have been set by Li Tianfeng to set rules and must be sent here and reviewed by Li Tianfeng himself.

The fan blade design is beautiful, the aerodynamic performance is excellent, and the fan receiver design is exquisite. This is Li Tianfeng's evaluation of these designs.

Two months passed quickly!

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

For example, the compressor of the turbofan 21 engine has a compressor of 6 stages. Although the number of stages is the same as that of some aircraft engines, the performance of the compressor cannot be the same, and the design structure is very different.

The same 6-stage compressor has a compression efficiency much higher than that of ordinary aircraft engines, and has very good aerodynamic performance and excellent surge margin.

Moreover, the weight of the compressor is probably less than half of the weight of the compressor of the ordinary aircraft engine. Because many parts of the compressor of the turbofan 21 engine adopt "Hercules" and is a brand new design.

Adopt a new overall blade disc design!

That is, the compressor blades and the compressor roulette are integrated. One whole, a six-stage compressor, and six integral blade discs are made of "Hercules" material. The six integral blade discs are installed together to form the main body of the compressor.

Such a design not only has good manufacturing technology and excellent aerodynamic performance, but also has very simple assembly and greatly reduced manufacturing cost.

As time enters November, the comprehensive design of the turbofan 21 engine has come to an end, and the design technical outline of the turbofan 25 engine has also been released.

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

Turbofan 25 engine. A dual-rotor small-passage-type afterburner turbofan engine uses vector nozzles, and both vector and thrust are controlled by digital electronic systems.

The new generation of full-function and full-authority digital electronic control systems is more advanced than the electronic control systems of the Turbofan 16, Turbofan 17, and Turbofan 18 series engines. It is a leading generation.

Design characteristics of turbofan 21 engine, fan level 2, compressor level 6, new high-load and high-efficiency combustion chamber, single-stage low-pressure turbine, afterburner combustion chamber, etc.

The engine has a thrust-weight ratio of 15, a maximum thrust of 165kn (about 36,000 pounds), and adopts a 1-0-1 high-pressure rotor support method. The engine has a simple structure, 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 reading this design technical outline, it took Li Tianfeng three days. If you just read it from beginning to end, half an hour would be enough, but Li Tianfeng is more than just reading it once.

Since he did not personally write this design technical outline, Li Tianfeng naturally needs to be very careful and careful. Li Tianfeng has to consider and calculate some performance parameters himself. Li Tianfeng needs to correct and improve some unreasonable aspects one by one, etc.

Overall, this design technical outline is very good and very good, but Li Tianfeng still modified it to make it even better and better.

In three days, the design technical outline of Li Tianfeng's "major operation" was basically no problem. After the inspection was correct, Li Tianfeng even called Sun Xiaoping, Qiu Wen'an, the two chief model designers, over.

After giving a small lecture, giving guidance, and giving a "face-to-face teaching", Sun Xiaoping and Qiu Wen'an happily left Li Tianfeng's office with this design technical outline.

The two walked towards the R&D center while talking.

Sun Xiaoping said: "Old classmate, I thought this design outline should be basically free of any problems, basically fully reflecting our level. I didn't think that after the boss said this, there were really a big problem."

Qiu Wen'an: "Yes, but after such modifications, the future turbofan 25 engine will be even better. Whether it is reliability, repairability, manufacturing cost, or overall performance, it will be excellent, and it will completely surpass the 119 engine."

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

Qiu Wen'an said: "Yes, we are so lucky. Since we joined Tianfeng Technology Company, our destiny has taken a big turn. It's really unimaginable that this engine was successfully developed and will leave the names of you and me in the history of the aviation industry in the Republic."

Leave the names of the two!

Sun Xiaoping was even more excited. Sun Xiaoping said: "What we can do is work hard. Now I have deeply understood what the meaning of 'a scholar dies for his confidant'!"

...

Two days later, the modified version of the turbofan 25 design technical outline was sent to Li Tianfeng's desk again. After reading it carefully, Li Tianfeng felt that there was basically no problem anymore, so Li Tianfeng called Zhang Haiping.

Zhang Haiping is one of the main leaders of the military in the turbofan 25 engine project and is also Li Tianfeng's main contact person.

After a phone call, Li Tianfeng said: "Director Zhang, if you have something to report to you."

Zhang Haiping said: "Mr. Li, we don't need to be polite. Is the design technical outline of the turbofan 25 engine released?"

Li Tianfeng said: "Minister Zhang, you are really imaginary."

Zhang Haiping soon became interested: he said happily: "Really, it's great! In this way, I will come to Tianfeng Technology Company in person tomorrow."

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

Li Tianfeng said happily: "Director Zhang, then I will wait for you to welcome you."

Zhang Haiping laughed...

………

Li Tianfeng didn't think that before Zhang Haiping came, Yang Xianfeng came to him personally.

Yang Xianfeng and Liu Qingshan came to Tianfeng Technology Company in person. When Liu Wei received the notice, Li Tianfeng had just finished the phone call with Zhang Haiping.

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

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

At the same time, Li Tianfeng thought to himself that it is obviously impossible for the two of them to come here in person, but it must be a public business. If it is a private matter, they can find themselves privately, have a drink and chat with them, and have explained all the private matters clearly.

If it is a business, what is it?

Li Tianfeng had a big question mark in his mind and quickly walked into the reception room not far away. As soon as he entered the door, Li Tianfeng smiled and seemed very enthusiastic.

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

Now, Yang Xianfeng is the chairman and general manager of e Factory, and is a veritable top leader, while Liu Qingshan is the chief engineer of e Factory.

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

Yang Xianfeng said: "Mr. Li, I'm disturbing. We came here presumptuously, but there is no way. We have been thinking for a long time. Thinking about it, only you can help us."

Li Tianfeng signaled the two of them to sit down, and Li Tianfeng sat down himself. Li Tianfeng said: "Mr. Yang, it seems that you are in trouble?"

Yang Xianfeng said: "I have encountered a lot of difficulties. I need you to help us, otherwise it will be difficult for us to overcome this difficulty."

Li Tianfeng said: "Mr. Yang, is the business problem?"

Yang Xianfeng said: "That's right, when Duan Hongjiu worked in the e-plant, he left a lot of mess. One of them was the gas power generation project he was engaged in, and he invested a lot of money. As a result, the gas turbine generators were not sold, but the funds were invested hundreds of millions. We are now in a short position."

Li Tianfeng pointed a little and said very readily: "Mr. Yang, if you want to borrow money, there is no problem. Our Tianfeng Technology Company can easily take out the funds of hundreds of millions of dollars."

Yang Xianfeng was grateful for it and then said, "Mr. Li, we have basically solved the problem of funds. We have borrowed 300 million yuan from the bank, which is basically no problem."

A state-owned old factory like E Factory, a military-industry unit with a deep foundation, has no problem finding a bank loan of 300 million to 500 million yuan. You should know that E Factory was once very glorious and was once a key construction project during the 1950s of the country.

However, over the years, especially since the market economy, it has gradually declined, and now it has to rely on loans to survive.

Li Tianfeng said: "Mr. Yang, since it is not a problem of funds, it must be another problem. Don't worry, since Mr. Yang has spoken, as long as we help, we will do our best."

Li Tianfeng had a good attitude. He didn't ask about any difficulties at first, but expressed his opinion and tried his best to help. Yang Xianfeng and Liu Qingshan looked at Li Tianfeng gratefully.

…………
Chapter completed!