On Li Tianfeng's desk, there is a main bearing of a turboshaft D engine, which is a bearing produced by Linhai Technology Company according to the improved process.

"It's so exquisitely done, and it's so beautiful to look at." Li Tianfeng took a magnifying glass and looked at it, and he couldn't help but feel bursts of praise in his heart.

Several main bearings of turboshaft D engine, Linhai Technology Company has produced a batch according to the improved new process, but the number of each batch is not much, if the engine is to be installed, it is only the amount of two or three engines.

These bearings have been tested in Linhai Technology Company, and the preliminary test has been carried out on the bearing test equipment, and the quality has been improved a lot, no, these bearings have been sent to Tianfeng Technology Company, and will be installed on the turboshaft D engine for verification and testing.

Li Tianfeng took this bearing and looked at it, very satisfied, according to Li Tianfeng's professional vision, this bearing is of excellent quality, which is comparable to foreign imported aviation bearings.

In addition, Li Tianfeng also looked at the test report and test report of this bearing, and the number of items was very good.

Li Tianfeng looked at this bearing with satisfaction, as if he couldn't put it down, with high-quality aviation bearings, not only the reliability of the turboshaft D and turboshaft E engines, the service life will be further improved, and the turbofan engine being developed will also have high-quality aviation bearings available.

However, the bearings of aero engines, especially the main bearings, can not be child's play, even if Li Tianfeng personally thinks that the quality of the bearings is good, but also after strict verification and testing, installed with aero engines, after strict verification and testing, after testing. After strict inspection and conclusions, the aero engine can be installed in batches.

Although the final test run, Li Tianfeng's heart is already very satisfied, if the verification test is smooth, these bearings can fully meet their own requirements. The significance is heavy, not only their own aero engines have high-quality bearings, but to fill the domestic gap, in one fell swoop to break the monopoly of the world's bearing giants on high-end bearings.

Just think about it, it's exciting enough!

At present, the domestic situation, high-end bearings have been a short board in the research and development of aero engines in China. The bearing has a high technical content, which can be used as an important standard to measure the scientific and technological and industrial strength of a country. Today's world's science and technology, industrial power, without exception, is a bearing research and development, manufacturing power.

The reason why China is an industrial power rather than an industrial power is that the bearing industry is large but not strong, and the production is mainly low-end bearings. High-end bearings mainly rely on imports.

The high-reliability and high-precision top-level bearings used for aero engines have become the "Mount Everest" that is difficult to climb in China's aero engine research and development.

Taking the main bearing of an aero engine as an example, the main bearing is one of the key components of an aero engine. Running under the conditions of high speed, high temperature and complex stress, the quality and performance of the main bearing directly affect the performance, life and reliability of the engine.

One of the key indicators of aero engines is high reliability. In order to ensure reliability, one of the prerequisites is to ensure that the bearings in the engine have a long life -- the life of the main bearing, the requirements of military aircraft aero engines are more than 3,000 hours, and the requirements of civil aircraft aero engines are even higher, reaching tens of thousands of hours.

The working environment of bearings in aero engines can be described as "purgatory", which not only has to run at a high speed of tens of thousands of revolutions per minute for a long time. It is also subjected to various forms of stress extrusion, friction and ultra-high temperatures.

In addition, for general structural components. Even mild cracks can ensure safe use - this is professionally called damage tolerance, and key transmission components such as the main bearing of aero engines do not have damage tolerance, and cracks and other forms of damage are never allowed during use. At present, the life of the main bearing of China's aero engine is limited, and the bearing has become a "short board" in the barrel principle.

At present, the R&D, manufacturing and sales of high-end bearings are basically monopolized by the world's four major bearing giants, namely Timken of the United States, NSK of Japan, SKF of Sweden and Schaeffler (FAG) of Germany.

And now. This kind of monopoly situation, the shortcomings in the research and development of domestic aero engines are about to be broken by themselves, Li Tianfeng just thought about it, and his heart was slightly excited. This is completely historic.

In addition, Li Tianfeng, a Linhai technology company, owns 40% of the shares. It is also its own half of the enterprise, with such a bearing manufacturing process, will continue to produce high-quality medium and high-end bearings, and the development prospects are very ambitious.

Perhaps, in less than two or three years, this enterprise will develop into a domestic bearing industry giant, monopolizing the domestic high-end bearing market is possible, and then over time, the development of the world's bearing industry giants, and the world's four major bearing industry giants, it is entirely possible.

Li Tianfeng seems to never get tired of looking at this bearing, and after looking at it repeatedly for a long time, Li Tianfeng picked up the phone and arranged the test run of the bearing verification test, first of all, the main bearings of the turboshaft D engine for verification and commissioning, and then the test run of the turboshaft E engine.

The test test was properly arranged, Li Tianfeng thought in his heart, don't let yourself down, you must meet your own requirements, if you really complete the verification test and fully meet your own quality and performance requirements, what a cool thing it will be.

………

As the days passed, it took several months for Tianfeng Technology's turbofan engine to enter the stage of comprehensive detailed design.

The fan part was the first to complete the design, the trial production of the fan blades has even been almost completed, the design of the high-load compressor, after the completion of the preliminary design last time, a technical review meeting was carried out, and a lot of various problems were collected, and the design team led by Sun Xiaoping has been designed and improved again, and the technical review has been carried out again a few days ago.

The design of the high-load compressor is very technical, and so many new designs and new materials are used, and the second design review is basically barely clear, and there are a small number of problems that need to be improved and perfected, and finally, the third review may be carried out.

Li Tianfeng estimates that after the completion of the third design review, the design of this compressor part can also be basically finalized, only waiting for various verification and tests in the future.

Today, in a conference room of the Aero Engine Design Institute, the second design review of the combustion chamber section has been completed, and the design has been improved and refined based on the previous review, and the second design review is now underway.

Turbofan engine, several important components, fan, compressor, combustion chamber, turbine, tail spray and accessories, etc., in terms of technology, the overall technical content of turbofan engine is generally higher and more complex than that of turboshaft engine.

Let's first get acquainted with modern advanced turbofan engines, modern fighter jets, military transport aircraft, civil aviation trunk airliners, etc. are all turbofan engines.

To put it simply, a turbofan engine has 2 concentric circle ducts, which are composed of 5 parts: fan, compressor, combustion chamber, turbine, and nozzle. Among them, the compressor, combustion chamber and turbine are often collectively referred to as the core engine of the engine.

The main difference between the turbofan engine used in fighter aircraft and transport aircraft and civil airliners is the fan, and the engine of the passenger aircraft generally uses a large-diameter fan, which can reduce the fuel consumption rate; Fighter jets generally have smaller engine fan diameters for supersonic flight.

Air flows in from the intake of the turbofan engine, compresses by the compressor, mixes with kerosene in the combustion chamber, expands through the turbine and nozzle, and finally sprays out of the tail nozzle at high speed. Part of the thrust of the turbofan engine comes from the reaction force generated by the injection of gas; The other part is the turbine drive fan, which rotates to drive the air and the reaction force that is ejected through the engine duct.

Why are turbofan engines so difficult?

Imagine that the maximum afterburner thrust of the AL-31 turbofan engine of the Su-27 is 12.5 tons, and 2 AL-31s can propel the Su-27 of more than 20 tons to fly at more than 2 times the speed of sound. But the AL-31 has a fan diameter of less than 900 mm and a turbine diameter of less than 300 mm.

According to the basic principles of physics, forces interact with each other, which means that such a small size fan and turbine in turn have to bear a force of 12.5 tons at all times. Figuratively speaking, everyone should have seen the performance of a strong man pushing a car with a steel gun against his throat, and the turbofan engine is probably the same, but the strong man pushes the car slowly, and the turbofan engine pushes the aircraft to fly at 2 times the speed of sound, and all parts have to withstand the extremely harsh high temperature and high pressure test.

In addition, a turbofan engine used in a supersonic fighter is generally only about 1 meter in diameter and about 4 meters in length. Taking the AL-31 as an example, such a small cylindrical object should be stuffed into a 4-stage fan, a 9-stage compressor, a 2-stage turbine, a convergent-expandable nozzle, a combustion chamber, an afterburner, a cooling air channel in between, and a fuel control system installed around it.

Therefore, it is extremely difficult to design and manufacture a high-performance turbofan engine, which can be described as 'making a dojo in a snail shell'. In the world, the only one who has mastered the first-class turbofan engine manufacturing technology is the British Luo? Russia, Pratt & Whitney, and General Motors, Russia and France are all second-rate, and this is a real high-tech industry, and it is also a real monopoly industry.

This turbofan engine of Tianfeng Technology Company is to break this monopoly barrier and let several major aviation giants know that China can also independently develop and manufacture the world's advanced turbofan engine.

………

Today's two watches, the first one is sent.

I'm sorry.,I can only add two chapters today.,There's too much to do today.,Morning,Afternoons are in meetings.,There's no time code word at all.,I originally wanted to think of three more plans to be completely lost.。 (To be continued......)