In the aviation industry, there is a saying that has been widely circulated: if the aviation industry is the crown of a country's manufacturing industry, then the aero engine is the most brilliant pearl in the crown.

The production and development cost of aero engines is very high, so how to reduce the material cost and manufacturing cost of parts, and reduce the cost without affecting the service life of the engine has always been a very big difficulty.

Due to the limitation of the Jishu level, the service life of the turbine parts of military aero engines is generally stipulated in China is not less than 2,000 hours, while the service life of foreign military aero engines is basically more than 10,000 hours.

However, let the steel hammer to make the F119, Chen Xin's requirements will only be higher.

Chen Xin put steel ingots, nickel plates, vanadium pentoxide, titanium powder and other materials on the operating table in different categories, and said to the steel hammer who was looking at these metal materials with shining-eyed eyes: "Steel hammer, go on!"

nodded and said excitedly: "Old Bean, look at me!"

As he spoke, its body made a clicking sound, which quickly dissolved like mercury, turning into a flowing pool of liquid on the stainless steel countertop, which spread like a living creature towards the metal material in front of it.

The moment the metal material comes into contact with the liquid, it melts as quickly as ice cubes in boiling water at a speed visible to the naked eye.

The turbine disc to be made by the steel hammer is also called the "turbine blade disc", and the shape looks like a superalloy plate group with fan blades (not the outer fan of the large blades that can be seen on the outside of the engine, but the groups at the back, which means X-class blades), which are mainly responsible for air channeling, precompression, etc.

In the early days, the "plates" and "fan blades" were separated, and they mainly relied on tenons to assemble them.

In the 70s of the last century, the turbofan and other engines of the United States, Britain and the Soviet Union all adopted the "integrated disk" (or integral disk) jishu, and the American General Motors Company first completed the productization, and in the 80s, F22, F35 and other projects promoted the development of the overall disk.

Turbine blade disc is the core of engine processing technology, the basic requirements are "uniform, pure, dense, lightweight, endurance, heat resistance, tensile resistance, pressure resistance", high-thrust military turbofan engine turbine disc is generally used nickel-based or titanium-based superalloy materials, which is the current mainstream, the so-called nickel-based, titanium-based is actually a kind of alloy steel, just like the lithium-based materials of large aircraft.

In fact, the materials used in turbine discs are not only these, from the early ordinary alloy steel to the later nickel-based and titanium-based single crystal alloy materials to composite and ceramic-based materials.

The composite base material is mainly carbon fiber composite substrate, this material is more difficult to do, the first British experimented in the 50-60s, and later because the tensile force of carbon fiber is too large, the fan speed is fast, the fan blades will be deformed, and the British failed after investing in the sky-high price.

Due to the wrong technology tree, the British began to lag behind the Americans in turbofan engine research.

Of course, this is related to the comprehensive national strength of a country, and the Americans had the money and ability at that time, and at the same time carried out the development of N models and N engines of different jishu routes, and they were not afraid of falling behind.

As for the ceramic-based turbine disk, this jishu is more difficult, representing the future development direction of aero engines with a thrust-to-weight ratio of 20.

At present, the progress of the Europeans is not clear, the Soviets have done it, and it is not known whether the Japanese have left the laboratory.

Chen Xin only knows about the "comprehensive high-tech push project" experiment in the United States, and I heard that the effect is good.

The so-called "comprehensive high push" is not to develop an engine, but to explore the development of engines (the Americans are leading the world in the world, because they have decades of large-scale investment in sustainability, and not only for the weapon model, but also for the basic theory and engineering to spend a lot of money), and finally to explore the feasibility of a turbofan engine with a 1:20 thrust ratio.

As for whether the scientific research institutes of China's aviation industry are not engaged in this project, Chen Xin is not particularly clear.

………………

After the steel hammer absorbed the metal material almost completely, the area of the liquid on the worktop also increased considerably, but it never spilled into the worktop.

Soon, the liquid moved and began to gather together, and a disc-shaped outline appeared in the middle, and then the outline gradually became clear, and the shape of a leaf appeared on the periphery.

This section is basically the directional recrystallization process of the metal alloy, the interatomic metal bonds are constantly broken and recombined, forming an extremely stable crystal structure, under the effective intervention of the steel hammer, the transverse grain boundaries sensitive to voids and cracks are basically eliminated, and the most perfect form of the metal alloy is revealed.

In less than five minutes, the F119's engine turbine disc is manufactured, and when all the turbine parts are formed, the steel hammer absorbs all the remaining liquid metal and digests it as food.

At this time, what appeared on the operating table was a turbine part that could be called a work of art, the surface was shining with a silver luster, and all the blades were evenly distributed around.

Chen Xin put the turbine disc aside, and then let the steel hammer move on to the next component.

The F119 engine is mainly composed of a 3-stage fan, a 6-stage high-pressure compressor, an annular combustion chamber with pneumatic nozzles and a floating wall flame cylinder, a single-stage high-pressure turbine, a single-stage low-pressure turbine with high-pressure turbine steering, an afterburner and a two-dimensional vector nozzle.

The whole engine is divided into six units, including a fan, a core engine, a low-pressure turbine, an afterburner, a tail nozzle and an accessory transmission casing, as well as accessories, FADEC (full authority digital electronic controller) and an engine monitoring system, which are manufactured in the order of assembly.

Due to the large number of parts, Chen Xin couldn't remember it at all, so he could only let the steel hammer make some core large parts first, and then slowly assemble the smaller parts while making them.

For two whole days, in addition to eating and sleeping, Chen Xin has been assembling the F119 non-stop, but fortunately, with the help of the "little butterfly", he was able to survive. Both of them put all their energy and attention into it, and finally assembled the first F119 engine at eight o'clock the next night.

When a part of Zuihou was installed, Chen Xin looked at the outstanding handiwork in front of him with some dazziness, and only felt that the hard work of these two days and two nights was completely worth it.

It is estimated that no one would have imagined that one night in June 2011, someone would actually manufacture the most advanced aero engine on Shijie in a workshop-style warehouse.

Chen Xin first measured the shape data of the copycat version of F119, of which the maximum diameter is 1.13 meters and the length is 4.826 meters, which is basically the same as the prototype, but when measuring the weight, Chen Xin found that the weight was nearly 100 kg lower than the original, only 1360 kg.

Chen Xin was surprised: "Steel hammer, what's going on, how is the weight different?"

The steel hammer cut a small piece from the nickel plate stacked on the side and put it in his mouth and chewed it, and said nonchalantly: "Old Dou, do you look down on the steel hammer? Isn't it just a hundred kilograms of weight loss? Rest assured, there will be no decline in performance, maybe there will be improvement." ”

Chen Xin quickly mentally calculated, the American version of the F119 engine afterburner thrust of 155.7 kN, weight 1460 kg, thrust-to-weight ratio of 10.88, if the weight drops by 100 kg, the thrust remains the same, then the thrust-to-weight ratio will reach an astonishing 11.68.

It is important to know that the thrust-to-weight ratio of the engine is the core data of this engine, which is extremely important for a fighter.

Generally speaking, the engines used in the third generation fighters, such as the F110 series, AL31F series, China's "Taihang", etc., are basically about 8 thrust-to-weight ratios, and the thrust-to-weight ratio of 10 engines at this level is usually used in fourth-generation fighters, and at present, only the F119 series and F135 engines equipped with the F22 Raptor and F35 are equipped with the two engines.

As for the European Shuangfeng (Typhoon and Rafale), the thrust-to-weight ratio of the EJ-200 and M88 medium-thrust engines they use is only about 8.5.

Therefore, if China's J-20 is equipped with an engine with a thrust-to-weight ratio of 11.68, it can completely blow up the F22 of the US imperialists.

Chen Xin and cooperated to lift the F119 engine onto the test bench, and then opened the warehouse door, and after finished searching and reported that there was no one else within one kilometer of the surrounding area, Chen Xin waved his hand and said: ", ready for testing!"

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