"Our Soviet aerospace technology is the best in the world. Pen? Interesting? Pavilion wWw. ｂiquge。 info" After watching the entire production line and returning to the conference room, Andrei said with great emotion.

The scene just now gave Andre an impression of great shock. Although Andre flew an airplane in later life, and in Shenfei, he originally assembled fighters, Andre had seen the fighter production line, but he had never seen the engine production line.

Although the Dawn Factory affiliated to Shen Fei is also producing engines, it is an old-fashioned turbojet, and as for the turbofan 10, it has always been developed and developed, and has not been produced in large quantities.

And now, at the Salute factory, Andrei saw the production line of the engine, and the shock was unimaginable.

Aero engine is the crown of the machinery industry, the world can independently develop engines, a slap can be counted, and advanced turbofan engines, need a variety of industrial base, materials, processing technology and so on.

When visiting the titanium alloy welding workshop, Andrei saw the welders enter the pressurized chamber wearing protective clothing that looks like spacesuits, enter the airlock through the first door of the pressurized chamber, connect the snorkel to the protective suit, and then close the hatch and inject argon into the airlock. After the airlock is filled with argon gas and the pressure is balanced, the welder opens the second door and enters the pressurized chamber to start working. Inside, the sparks of the arc fly and have a unique beauty, just like welding in space.

At the same time, I also saw the equipment produced in the island country, which is used to carry out vacuum electron beam welding, and the action of the robotic arm is like a science fiction blockbuster.

In another workshop, I saw CNC breakdown engraving abrasives, which are used to cast single crystal blades, each of which is almost as valuable as gold of the same weight. After Andrei asked, he knew that these CNC machine tools were new machine tools developed by the Soviet Union after absorbing the manufacturing experience of CNC machine tools in island countries, and Andrei was extremely satisfied.

The last to enter is the test bench, the assembled engine, need to go through the test bench test, qualified, can be transported, the roar of the engine, in the test bench is extremely shocking.

Now, Andrei's ears are still buzzing, and at the same time, Andrei's face is full of smiles.

"Now, I will give you a report on the development of the new AL-41 engine." At Rurika's side, said an experienced chief engineer.

Although Rurika is still in charge, he is already old after all, so the chief engineer of the new AL-41 engine was handed over to his deputy, Dr. Cha Jin.

"Since we have just finished the development of the AL-31 engine, our new AL-41 engine is based on the design of the AL-31 engine, and then obtained through a series of improvements." "Our design work began at the beginning of last year, codenamed 'Product 20', and we used new structural materials – ceramics, cermets, and improved the design, changed the cycle parameters, used high-load turbine and compressor blades, increased the turbine pre-temperature, and finally reached a thrust scheme of 20 tons," said Dr. Che Jin. ”

20 tons! In the Product 20 project, this engine needs to achieve a maximum afterburner thrust of 20 tons, and the thrust-to-weight ratio reaches 11! In the current view, this is simply a fantasy number, but if you want the next generation of fighters to have majestic thrust, this is an inevitable choice!

"At the same time, in terms of control, we will change the original hydraulic control system and adopt digital fly-by-wire control in order to adapt to the integrated control system of the new generation of fighters. Right now, we are in the process of designing the engine in detail, but we still have a technical problem that has not yet been determined. ”

Hearing Dr. Cha Jin's words, Andrei couldn't help but ask, "What technical problem?" "I don't know much about technology, but I have a lot of experience from later generations!

"It's a vector nozzle, and until now, we haven't determined the specific form of the vector nozzle."

Vector nozzles! The next generation of fighters must have strong maneuverability, and the strength of maneuverability is not only related to the engine thrust, but also related to various rudder surfaces.

The various direction control of the aircraft is all realized by the rudder surface, and at the large angle of attack, many rudder surfaces have lost their aerodynamic torque, and it is easy to stall and crash, and the vector nozzle of the engine is to let the engine in addition to producing backward thrust, and will also divide a part to other directions, such as up and down, the engine nozzle is deflected up and down, and the thrust generated no longer passes through the center of gravity of the aircraft, resulting in the pitching force distance around the center of gravity of the aircraft, and then the thrust plays the same role as the control surface of the aircraft. Since thrust is generated only by the engine, even if the angle of attack of the aircraft exceeds the stall angle of attack, the thrust can still provide the torque to level the aircraft, and as long as the wings can generate enough lift, the aircraft can continue to fly in the air. Such a fighter has the ability to maneuver over stall, and if the vector nozzle can also turn left and right, it can not only control the pitch, but also control the course left and right.

Therefore, thrust vectoring technology is also a must for the next generation of fighters, but what scheme should be used to solve this technology is also a difficult problem.

"The simplest solution is to put a baffle directly inside the nozzle, but this way loses the most gas, which is not cost-effective. In addition to this simplest option, there should be three alternatives, for example, the spout should be rectangular or four adjustment plates that can be rotated together. This method has a simple structure and is relatively easy to implement, but when it will turn square, the airflow will be blocked by some parts of the square nozzle, resulting in a partial loss of thrust, but this form of tail spray structure will have a better modification effect on the rear of the fuselage, matching with our new stealth fighter, and at the same time can control pitch and yaw. The second is the overall deflection of the nozzle, which requires a minimum of sealed moving parts, and at the same time is light in weight and easy to achieve with process materials, however, this requires the formation of a structure slightly larger than the maximum diameter of the engine at the tail of the engine to accommodate the hydraulic rod that powers the overall deflection of the nozzle, that is, our fighter will suddenly become thicker when it reaches the rear. The third is the deflection of the tail spray blades, but this way has the most moving parts, and it is a tragedy if the seal fails. ”

Andrei said as he gestured with his hand, and analyzed the three main ways, and said it to the point, listening to Dr. Che Jin, Rurika and others all nodding their heads constantly, saying that General Andrei was very knowledgeable and knowledgeable, and now when I hear it, it is indeed so!

"And General Andrei, do you think that's the best way?" Rurica asked.

In fact, this is the knowledge of later generations, and as a pilot, Andre certainly knows how these vector nozzles are composed! The second of them is simply impossible to achieve, the first is the structure of the binary vector nozzle used by the F-22 in later generations, and the third is the structure of the axisymmetric vector nozzle used by Russia, if it comes to performance, it should be Russia's performance is better, a nozzle is biased up, a nozzle is deviated down, and it can also control rolling, which is the most amazing stunt for pilots.

However, this thing also has a weakness, which is longevity!

In later generations of China, Ah San, who was eyeing the south, bought the Su-30MKI to fight against the Su-27 fleet in Huaxia, and in order to satisfy their superiority psychology, Ah San bought the latest Russian technology, such as vector nozzles! This is in Ah San's eyes, but it is a big killer! They also fantasized about using this thing to fight with the Huaxia pilots, and then teasing the Huaxia pilots for fun.

When the Su-30MKI equipment was given to Ah San, Ah San suddenly discovered that this advanced technology requires a certain price, for example, in terms of life, the nozzle of the engine of Ah San's aircraft has a life span of only 50 hours!

What does this mean, even if you only fly for two hours per flight and 10 times a month, then you can only fly for two or three months, and the tail nozzle will have to be changed! Ah San suffered this loss, I don't know if I will have a longer memory.

Although there is a relationship between the great reduction of Russia's economic strength in later generations, the short life of this vector nozzle is also an inevitable common problem, there are too many moving parts, as long as one of them goes wrong, it is definitely a fire!

(The vector nozzle of the American F-22 is said to have a lifespan of 250 hours, which is far greater than that of Ah San.) ）

And now, it is just the 80s, and the Soviet Union has just developed the AL-31 engine, which is several years ahead of the progress in history, of course, and the Soviet Union has obtained the American-made F-15 fighter, studied the F110 engine above, and has a lot to do with it. However, on the tail nozzle, this must be studied on your own.

"Among these schemes, I think the first scheme is the most suitable, with low infrared radiation, easy to match with the fuselage of the new generation of fighters, and at the same time, the moving parts are small and the life is longest."

Andre's profound knowledge made the engine experts present nod for a while, in fact, in their hearts, they are inclined to the third scheme, but they have no bottom in their hearts, there are too many moving parts, it is easy to fail, in terms of service life, it will definitely not be too high, no matter how to improve, because there is a high temperature and high pressure environment, it is a fatal test for any material.

"Then let's take the first option as the main option, and the third option as the alternative." Rurica said. (To be continued.) )