In the conference room, it was very quiet for a while.

Li Tianfeng looked at this document and looked at a series of parameters, as well as the specific requirements of the military for this engine.

The document is not thick, only a few pages, this is not a technical outline of the design of the engine, it is just a series of requirements put forward by the military, however, there are still quite a few technical parameters.

Fourth-generation small signal channel ratio turbofan engine!

The thrust-to-weight ratio is not less than 10, and the maximum thrust is not less than 15,000 kg (about 33,000 lbs)!

The life of the first translation period is not less than 1500 hours, and the service life is not less than 15 years!

……

Li Tianfeng hurriedly looked at this military technical document, and thought in his heart, even if such an engine is successfully developed, although it may not be as good as the American F119 engine, it will definitely surpass the current AL-31F engine and F100 engine in an all-round way.

Mr. Lin of AVIC Group also personally looked at this technical document, and after reading the document, he couldn't help but look at Li Tianfeng, and Li Tianfeng nodded, saying that he had no problem.

Seeing this, Mr. Lin sighed and thought in his heart, Tianfeng Technology Company said that there was no problem, and even if he had a problem, he could not mention it at the meeting.

Seeing that both sides had finished reading this document, the major general couldn't help but say loudly: "All stand up!" ”

After speaking, Comrade Major General was the first to stand up, and all the personnel in the conference room immediately stood up, and the atmosphere in the entire conference room immediately became formal and serious.

The major general said with a straight face: "On behalf of the military, I will give you a formal research and development task. After speaking, the major general picked up the first task book and said with a straight face: "Tianfeng Technology Company, please come and accept the task book!" ”

Li Tianfeng took a few steps forward and took over the military's mission book from the major general. Seeing the bright red seal on the task book, Li Tianfeng's face was positive and serious, and he said loudly: "Please rest assured that the military will successfully complete the task of Tianfeng Technology Company!" ”

AVIC Group has also taken over the task book, and the development of this engine will start soon. And it was developed by two companies at the same time.

Comrade Major General said: "The research funds will be allocated within a week, and I hope that you will carry forward the spirit of not being afraid of difficulties, move forward bravely, ensure quality and quantity, and develop this engine that we urgently need for our military in accordance with the requirements of the node." ”

Comrade Major General changed his words and said in a calm tone: "Of course, we know that the development of such an engine must be difficult. But in order for us to make technical preparations for more advanced aero engines and lay a good technical foundation, we must set the starting point a little higher, and I hope you can understand this. ”

After speaking, Comrade Major General took the lead in saluting, a solemn military salute, and several other military personnel. It is also a brush, and the action is uniform. They all saluted a solemn military salute.

Li Tianfeng's heart was slightly moved, and suddenly, at this moment, Li Tianfeng felt that the heavy responsibility on his shoulders was a thousand pounds, and he also saw the ardent hope of the military.

We are a big country, an economic power. It is also a military power, but it does not have an excellent military engine, and the military's hopes are pinned on itself.

Li Tianfeng also stood up straight and returned a military salute. Even if the action is not standardized, this military salute is full of Li Tianfeng's reverence for soldiers!

Finished!

The military personnel collectively turned back, and then the group walked out of the conference room, Li Tianfeng took this task book, and he could obviously feel the weight of this task development book.

In the conference room, it was very quiet, and the atmosphere just now could not be dispersed for a long time, until it was maintained for a few minutes, and everyone gradually came out of this atmosphere, and the atmosphere gradually eased.

Mr. Li of AVIC said: "Mr. Li, the military's hopes are so high, this heavy burden on our shoulders is not light, the fourth-generation small letter is more than a turbofan engine, think about it, I feel almost overwhelmed." ”

Li Tianfeng said: "Mr. Lin, since the task has been issued, then we have no way out, we can only overcome difficulties and strive to develop this engine." ”

Mr. Lin nodded and said: "It seems that this can only be the case, it is so difficult to achieve the final assembly of the first prototype machine in two years!" ”

Li Tianfeng nodded, even Tianfeng Technology Company, even Li Tianfeng, felt that this task was not easy, not simple.

Li Tianfeng said: "Mr. Lin, let's go first. After speaking, Li Tianfeng walked out of the conference room with Sun Xiaoping and Liu Wei.

Back at the hotel, Li Tianfeng carefully locked this top-secret technical document into his lockbox, this document, the entire Tianfeng Technology Company, there are only a few people who are qualified to see it, Sun Xiaoping should be counted as one, the development of this engine, Li Tianfeng still intends to appoint Sun Xiaoping and Qiu Wenan as deputy chief designers, Li Tianfeng himself is ready to be the chief designer himself.

This is the first small-frequency turbofan engine developed by Tianfeng Technology Company, a military aviation engine, and the power of the main fighter in service, and Li Tianfeng does not dare to take it lightly.

Since we want to develop it, we must develop an excellent engine that I feel more satisfied with, Li Tianfeng thought in his heart.

Li Tianfeng was about to think about this engine that was about to be designed, when Zhang Haiping's phone called.

Zhang Haiping said: "Mr. Li, just go back to the hotel, let's go, let's go have two drinks." ”

Looking at the time, it was close to noon, Li Tianfeng said: "Director Zhang, you can, but you have discipline, you can't drink bars at noon!" ”

Zhang Haiping laughed and said, "Then let's replace wine with tea and have a good chat." ”

………

Military hotel restaurant, window location.

Zhang Haiping was dressed in casual clothes, a few exquisite side dishes, and a pot of good tea, and the two chatted while eating.

Zhang Haiping said: "Mr. Li, the development task book has been received, is there any pressure?" ”

Li Tianfeng said: "Where can there be no pressure? The fourth-generation small signal turbofan engine was developed all of a sudden, and the pressure was huge. ”

Zhang Haiping said: "Mr. Li, I believe in your technical strength, because you already have a core machine, and you can develop it on the basis of the core machine." ”

Aero engine, the key is the core machine, the same core aircraft. Many types of aero engines can be derived, such as the turbofan 16 engine core engine of Tianfeng Technology Company, and the turbofan 17 engine and turbofan 18 engine are derived.

Li Tianfeng said: "Director Zhang, you are worthy of being a person who understands technology, that's right." It is with this intention that I will carry out research on this military turbofan engine on the basis of the turbofan 16 engine core engine. ”

Zhang Haiping said: "Mr. Li, I have worked hard for you in terms of research funds, a total of 1.5 billion, which is not less." ”

Li Tianfeng nodded, a total of 1.5 billion research funds is really not small. Naturally, the domestic national conditions cannot be compared with those of European and American countries, and they will invest more than a billion dollars or even billions of dollars in research to develop a new aero engine.

Li Tianfeng said: "Director Zhang, I want to thank you well, come, let's replace the wine with a drink, and have a good drink." ”

The two clink glasses. After taking a sip of the drink, Zhang Haiping said, "Mr. Li." If there is no accident, it should be the turbofan 20, and the engine developed by AVIC is the turbofan 19 engine. ”

Li Tianfeng was slightly surprised, the national project would be approved so soon. However, after thinking about it, I was immediately relieved that this was the 106 project, and the project was naturally very fast.

The two chatted for a long time in the restaurant. After returning to the hotel, Li Tianfeng did not go out in the afternoon, but was in his room, thinking about the development of this engine.

In Li Tianfeng's preliminary concept, the turbofan 20 engine, the whole engine is divided into: fan, core engine, low-pressure turbine, afterburner suffocation, tail nozzle and accessory transmission casing and other 6 units, in addition to accessories and automatic digital control system, engine monitoring system, etc.

The specific performance parameters must also be carefully scrutinized and determined, however, Li Tianfeng knows that such an engine, although there is no technical difficulty like the F119 engine, but there are also several major technical difficulties, in this regard, Li Tianfeng knows clearly.

One of the difficulties is the high-altitude and high-speed performance, especially the acceleration performance of the engine, Li Tianfeng clearly knows that as an excellent fighter, it must have the above performance and good maneuverability in order to easily complete a series of difficult tactical actions.

The second difficulty is excellent reliable performance. Because this is the power of the J-10, the J-10 fighter is a single engine, in case the reliability of the engine is lacking, in case there is any failure in the high altitude, the problem will be more serious.

For an aero engine to be reliable, it must be designed with proven technology and a simple overall engine with a small number of components.

In this way, many new technologies must be fully verified, even if Li Tianfeng knows that these new technologies have been fully verified in later generations, and now he wants to adopt this engine that is about to be developed, he must re-verify, which will take a lot of time.

The third difficulty is excellent maintainability. The engine must be designed to be particularly serviceable, for example, most of the accessories, including the fuel pump and control system, are used as field replaceable components, and all interchangeable units have a disassembly time of less than 20 minutes, and the tools used must be standard hand tools.

In addition, the fasteners that need to be disassembled and assembled during field maintenance are not allowed to use fuses and cotter pins, and the new self-locking nut of Tianfeng Technology Company must be used, and the wrench can not be used when tightening the nut.

The seat hole of the borehole detector is designed to be threadless and built-in, all conduits and wires are distinguished by different colors, the lubricating oil tank is equipped with a visual oil level indicator, and the connector is designed to be quick-dismounted and quick-assembled.

All accessories, wires and piping are directly accessible from each field replaceable component in the lower part of the engine. The engine is designed to be worn by most maintenance personnel of height and weight, wearing protective clothing and gloves, to perform routine maintenance work on the engine mounted on the aircraft.

The three major difficulties, these are the three major difficulties that Li Tianfeng can think about for the time being, in the development of the engine, there may be more than these three difficulties, this is not an easy job, even Li Tianfeng, also thinks.

…………

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