Chapter 698： Vector nozzle

"Our Soviet aerospace technology is the best in the world." After watching the entire production line, Andre said with a great sigh in the conference room.

The scene just now gave Andre a shocking impression. Although Andre flew planes in later generations, and in Shenfei, he was originally assembling fighter planes. Andre had seen the fighter plane production line, but he had never seen the engine production line.

Although the Liming Factory affiliated to Shenfei is also producing engines, it is an outdated turbojet. As for the turbofan 10, it has always been developed and developed, and has not been mass-produced.

And now, in the salute factory, Andre saw the production line of the engine, and the shock was unimaginable.

Aero-engines are the crown of the machinery industry. The world can independently develop engines, and it can be counted in one slap. Advanced turbofan engines require a variety of industrial bases, materials, processing techniques, and so on.

When visiting the welding workshop of titanium alloys, Andrei saw welders wearing protective clothing that looked like space suits entering the pressurized cabin, passing through the first door of the pressurized cabin to enter the airlock, and turning the The trachea was attached to the suit, and the hatch was closed and argon was injected into the airlock. After the airlock is filled with argon and the pressure is balanced, the welder opens the second door and enters the pressurized cabin to start work. Inside, the sparks of the arc fly, with a unique aesthetic, almost like welding in space.

At the same time, I also saw the equipment produced in the island country, which is used for vacuum electron beam welding, and the robot arm moves, as if it is a sci-fi blockbuster.

In another workshop, I saw a CNC breakdown engraved abrasive tool used to cast single crystal blades. Each single crystal blade is almost as valuable as gold of the same weight. After Andre asked, and learned that these CNC machine tools are new machine tools developed by the Soviet Union after absorbing the manufacturing experience of CNC machine tools in island countries, Andrei was even more satisfied.

The final entry is the test bench. The assembled engine needs to be tested on the test bench. After passing the test, it can be transported away. The roar of the engine is extremely shocking on the test bench.

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

"Now, it's up to me to report on the development of the new al41 engine." An experienced chief engineer said by Ruelika's side.

Although Liurica is still in command, he is old after all, so the chief engineer of the new al41 engine was handed over to his deputy, Dr. Che Jin.

"Since we have just completed the development of the al31 engine, our new al41 engine is based on the design of the al31 engine, and then obtained through a series of improvements." Dr. Che Jin said: "Our design work is Starting from the beginning of last year, code-named 'Product 20', we have used new structural materials ceramics, cermets, and improved designs, changing cycle parameters, using high-load turbine and compressor blades, and increasing the temperature before the turbine, and finally reached the 20-ton class. thrust plan."

20 tons! In the product 20 project, this engine needs to achieve a thrust of 20 tons of maximum afterburner thrust, and the thrust-to-weight ratio reaches 11! In the present, this is simply a fantasy number, but it is an inevitable choice for the next generation of fighters to have a majestic thrust!

"At the same time, in terms of control, we will change the original hydraulic control system and use digital fly-by-wire control to adapt to the integrated control system of the new generation of fighter jets. Now, we are in the detailed design stage of the engine, but, Now we still have a technical issue that has not been determined."

Hearing Dr. Che Jin's words, Andre couldn't help but ask, "What's the technical problem?" Although he doesn't know any technology, he has a lot of experience from later generations!

"It's the vector nozzle. So far, we haven't determined the specific form of the vector nozzle."

Vector nozzle! The mobility of the next-generation fighter must be strong, and the power of mobility is not only related to the thrust of the engine, but also related to various rudder surfaces.

The various directional controls of the aircraft are all realized by the rudder surface. When the angle of attack is high, many of the rudder surfaces have lost aerodynamic torque, and it is easy to stall and crash. In addition to the rear thrust, a part will be divided to other directions, such as up and down, the engine nozzle is deflected up and down, the generated thrust no longer passes through the center of gravity of the aircraft, and a pitching force distance around the center of gravity of the aircraft is generated. At this time, the thrust is exerted. It has the same function as the control surface of the aircraft. Since the generation of thrust is only related to the engine, even if the angle of attack of the aircraft exceeds the stall angle of attack, the thrust can still provide torque to trim the aircraft. 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 stalling. If the vector nozzle can still turn left and right, it can not only control the pitch, but also control the left and right heading.

Therefore, thrust vectoring technology is also necessary for the next generation of fighter aircraft, but it is also a difficult problem to solve this technology.

"The simplest solution is to put a baffle directly in the nozzle, but this will lose the most gas, which is not cost-effective. In addition to this simplest solution, there should be three alternatives. For example, whether the nozzle is Rectangular, or four adjustable plates that can be rotated together. This method has a simple structure and is relatively easy to implement, but when it is round and square, the airflow will be blocked by some parts of the square nozzle, resulting in a partial loss of thrust, but this form The tail jet structure of the fuselage will have a better shape modification effect on the rear of the fuselage, which matches our new stealth fighter and can control the pitch and yaw at the same time. The second is the overall deflection of the nozzle, which requires sealing The minimum number of moving parts while being light in weight and easy to implement with process materials, however, requires a structure at the rear of the engine that is slightly larger than the maximum diameter of the engine to accommodate the hydraulic rod that powers the overall deflection of the nozzle, that is, our fighter arrives aft The part will suddenly thicken. The third type is the deflection of the tail spray blade, but this method has the most moving parts, and if the seal fails, it will be a tragedy.”

While speaking, Andrei gestured with his hands, and analyzed the three main methods. He spoke righteously. He heard Dr. Che Jin, Ryurika and others keep nodding, saying that General Andrei was very knowledgeable. , The knowledge is rich, and when I listen to it now, it really is!

"Then General Andrei, which way do you think is the best?" asked Lyurika.

In fact, these are the knowledge of later generations. As a pilot, Andre certainly knows how these vector nozzles are constructed! The second type is impossible to achieve at all. The first type is the structure of the binary vector nozzle used by the f22 in later generations, and the third type is the structure of the axisymmetric vector nozzle used in Russia. If it comes to performance If so, it should be that Russia's performance is better. One nozzle is upward and one nozzle is downward, and it can also control the roll. This is the most amazing stunt for pilots.

However, this thing also has a weakness, that is, its longevity!

In Huaxia in later generations, Asan, who is eyeing the south, bought Su 30mki to fight against Huaxia's Su-27 fleet. Moreover, in order to satisfy their superior mentality, Asan bought the latest Russian technologies, such as vector spray. Tube! In Ah San's eyes, this 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 Asan, Asan suddenly discovered that this advanced technology requires a certain price. For example, in terms of life, the nozzles of the engines of Asan's aircraft , the lifespan is only 50 hours!

What does this mean? Even if it only flies for two hours per flight and 10 times a month, it can only fly for two or three months, and the tail nozzle has to be replaced! Asan ate this slump, I don't know if his memory will be longer.

Although the economic strength of Russia in later generations has been greatly reduced, the short life of this vector nozzle is also an unavoidable common problem. There are too many moving parts. As long as there is a problem, it is definitely a fire!

(The vector nozzle of the American f22 is said to have a lifespan of 250 hours, which is far greater than that of Asan.)

And now, in the 1980s, the Soviet Union has just developed the al31 engine, which is several years ahead of the historical progress. Of course, the Soviet Union obtained the US-made f15 fighter, studied the above f110 engine, and used it for reference. also has a great relationship. However, on the tail nozzle, this must be studied by yourself.

"Among these schemes, I think the first scheme is the most suitable. It has low infrared radiation and is easy to match with the fuselage of a new generation of fighter jets. At the same time, the moving parts are small and have the longest lifespan."

Andre's profound knowledge caused the engine experts present to nod their heads. In fact, in their hearts, they preferred the third solution. However, they had no idea about this solution. There were too many moving parts. It is prone to failure. In terms of service life, it will never be too high, no matter how it is improved, because there is a high temperature and high pressure environment, which is a fatal test for any material.

"Then we will use the first option as the main option and the third option as the alternative," said Lyurica. (To be continued.)