Zhou Tiemin did not directly talk to Liu Wancheng about the specific tasks, but asked him: "Have you heard of the collision incident in the South China Sea?"

Not a year ago this incident happened, and Liu Wancheng of course had heard of it, so he nodded.

Zhou Tiemin said: "Ordinary people don't understand the inside story. They always complain about the weak country and dare not fight head-on with others. However, our internal staff understand that we do not have the ability to fight head-on with others!

At that time, a military leader proposed to strengthen scientific and technological education for our pilots, understand the gap between us and others, and avoid such extreme behavior when dealing with such problems.

The old leader did not make any statement at that time. Afterwards, when he talked to us, he talked about this matter. He said that we should not blame our heroes!

Why? Because the other party bullies others too much!

Shortly before this incident, the US reconnaissance plane came to our East China Sea to investigate, and we also sent planes to drive them away.

However, the East China Sea was too close to their military base. They relied on the planes being advanced than us, and actually sent two third-generation aircraft to lock the planes we sent, forcibly landed us on our own airport, and then left!

Shame, this is the shame of every soldier! It’s no wonder that when something happens again in the South China Sea, our heroes cannot bear this shame and fight against the other side head-on! So, the old leader said, we can’t blame our own heroes. If we want to blame, we can only blame our own fighter jets behind!"

Speaking of this, Zhou Tiemin was silent.

Liu Wancheng didn't say anything, and he was also very depressed. Everyone was patriotic and everyone wanted their country to become stronger. However, historical reasons have made us too far away from the world's powerful countries. If we want to catch up or even surpass others, we can't just rely on the people to talk to each other. Because of work, he has been in the United States for a long time and is very clear about how big the gap between himself and others is.

At this time, Zhou Tiemin spoke again: "When the old leader was in poor health, he once said a few times that the country could not come up with a third-generation or even a fourth-generation aircraft that could compete with the enemy. He didn't want to die, and he was afraid of death. Because, he was worried about death if he died! The old leader still left, and we let him die with peace of mind!"

Speaking of this, there were tears in Zhou Tiemin's eyes. It can be seen that he and the old leader should have a deep relationship.

After a long time, Zhou Tiemin wiped his tears and said, "We have been working hard, from avionics technology, radar technology to pneumatic technology, wind tunnel experiments. Our technicians have sacrificed their families for everyone, and can be said to be at the point of sacrificing their lives!

Especially with your chip manufacturing technology and intelligent three-dimensional machine tool processing technology, we have overcome one difficulty after another. Judging from the technology we have mastered now, we can completely create fourth-generation machines that are comparable to the United States. Some technologies, we have even surpassed each other."

Liu Wancheng looked at Zhou Tiemin strangely. Since we have manufacturing technology, why not build it? We lack money?

Looking at Liu Wancheng's expression, Zhou Tiemin knew what he was thinking. He couldn't help but smile bitterly and said, "It's a pity that we can't build the heart and engine of the plane. On the engine, we have always counted on the supply of the major northern powers. If they don't supply us with higher-level engines, we can only make some second-generation aircraft by ourselves. At higher-level aircraft, we can only import theirs.

Therefore, although we have more advanced technologies in our hands, we can only leave them for nothing, and we can only let the old leader die with his eyes open!"

Aircraft engines, known as the jewel of the top of the aviation manufacturing industry tower, are currently only a few developed countries that can be manufactured, and Liu Wancheng knows this.

But why can't we create it? Where is the difficulty? He doesn't know.

Zhou Tiemin told him this, which was definitely not a purposeless chat, but must be related to the tasks that were about to be assigned to him.

So, what can he do in this regard?

Zhou Tiemin still didn't say what he asked him to do, but took out a few pieces of paper and a pen, and explained the aircraft engine technology to him while drawing pictures.

The engines before World War II were the same as our current automobile engines, both of which were piston-type. However, this kind of engine had a disadvantage, that is, the speed of the aircraft has a limit. When the speed of the aircraft approaches the speed of sound, the blades of the propeller will not withstand the high temperature of friction with the air and be damaged. In other words, a piston-type propeller engine cannot break through the sound barrier and can only be used as a low-speed engine.

So, there was the turbojet engine at the beginning. The working principle of this engine is completely different from that of a piston engine. It uses gas explosion and expansion, and it is directly sprayed backward as power to drive the aircraft to fly.

Therefore, aircraft made with this technology are called jet aircraft.

In 1937, the world's first turbojet engine was born. It is long barrel-shaped, rotated by multiple rows of impellers in the front, compressing air into the central combustion chamber, mixing with fuel, and igniting it. While the gas is sprayed out to the rear, it promotes the turbine coaxial to the multi-row impellers in the front. The turbine is connected to the multi-row impellers in the front by the rotating shaft, thus forming a repeating compressed air, ignition, and the jet operates continuously, generating power.

This is the most primitive jet engine. The second-generation engines we make and the northern powers to their model MiG 25 are all of this engines.

This kind of engine has many disadvantages. First, the engine's own temperature is too high, which can easily cause damage to internal parts, short service life and too high maintenance frequency, which is not conducive to combat. Due to the high temperature generated by the engine, it is also easy to be captured and shot down by the opponent's radar. Secondly, the fuel consumption is high, which greatly limits the combat radius of the aircraft.

So, there is a further engine now: a turbofan engine.

A turbojet engine has only one air channel, which is professionally called "cushion", while a turbofan engine has two air channels. In other words, a turbojet engine is a single duct engine, while a turbofan is a dual duct engine.

The turbofan engine is divided into internal connotation channels and external ducts. The principle of internal connotation channels is the same as a simple turbojet engine, which is called a core engine. The core engine drives a large fan in front, pushes the air in the front to gush backwards, enters the outer duct formed by the external fairing and the core engine shell, and then sprays out from the tail. This is equivalent to cooling the inside of the core engine, and also increases the backward power, achieving the purpose of cooling and fuel saving, protecting the parts of the engine from being easily damaged, and greatly saving fuel, effectively increasing the combat radius of the fighter.

Speaking of this, Liu Wancheng roughly understood the development history and principles of aircraft engines. However, he still couldn't understand the purpose of Zhou Tiemin talking to him about these things.

At this time, Zhou Tiemin put down the pen in his hand and said, "I know where our short version is currently?"

Liu Wancheng still shook his head, he really knew nothing about this.

Zhou Tiemin said: "With the principle and more precise computer technology, internal and external duct structure, axle, blade structure, bypass ratio, even the appearance of the aircraft and reasonable aerodynamic layout, our scientific research and technical personnel can design it through repeated experiments. Now, the difficulty lies in the manufacturing of high-temperature-resistant blades in the middle!"

Liu Wancheng was still confused. There were so many complicated things that could not be difficult, but could a small blade be created?

Zhou Tiemin explained: "Aero engines are known as the crown of the modern aviation industry and are also one of the important symbols of the country's comprehensive strength.

To improve the performance of an aircraft engine, it is necessary to improve the performance of its key component, the central heating turbine blade.

Turbine blades are listed as the first key piece because they work in an environment with the highest temperature, the most complex stress and the harshest environment. They are hailed as the jewel in the crown.

Turbine blades, also known as moving blades, are the components with the worst working conditions in turbine engines and the most important rotating component.

The gas inlet temperature of advanced aircraft engines reaches 1380℃ and the thrust reaches 226KN. The turbine blades are subject to aerodynamic and centrifugal forces, and the blade part is subject to tensile stress of about 140MPa; the leaf root part bears an average stress of 280~560MPa, the corresponding leaf body bears a temperature of 650~980℃ and the leaf root part is about 760℃.

This is the scientific data summarized by our scientists after repeated experiments.

The manufacturing process of engine blades directly determines the performance of the engine and is also a significant indicator of a country's aviation industry level.

In addition to high temperature conditions, the working environment of the hot-end blades is also in the extreme state of high pressure, high load, high vibration and high corrosion, so the blades are required to have extremely high comprehensive performance. This requires the blades to use special alloy materials and use special manufacturing processes to make a special matrix structure - single crystal structure, in order to meet the needs to the greatest extent possible.

Now, through the analysis of the disassembly and assembly of foreign engines, we know that the blade is hollow, that is, when it works, airflow flows through the inside and outside of the blade so that the temperature can be lowered at the fastest speed and kept within a lower temperature range, so that it will not be easy to burn out.

At the same time, we also know that this blade must be a single crystal and cannot have a crystal interface like other metal castings. Otherwise, when the blade encounters high temperature, it will melt from an unstable place in the crystal interface, thereby affecting the mechanical strength of the overall blade and not meeting the requirements.

Complex single crystal hollow turbine blades have become the core technology of current high thrust-weight ratio engines. It is the research and use of advanced single crystal alloy materials and the emergence of double-wall ultra-gas-cooled single crystal blade manufacturing technology that has enabled single crystal preparation technology to play a key role in the manufacturing of today's most advanced military and commercial aviation engines. At present, single crystal blades have not only been installed on all advanced aero engines, but are also increasingly used in heavy-duty gas turbines.

Your three-dimensional intelligent machining machine tool for rotating joints has solved the problem of fine-tuning of blades for us, allowing the blades we manufacture to achieve the highest accuracy and consistency, which is also where we are ahead of the world.

In terms of high-temperature resistant alloys, we have basically mastered the manufacturing methods and ratios through metallographic analysis and continuous experiments of foreign-made blades.

As for single crystal crystal casting, we have already done research and have made progress.”

Liu Wancheng was a little surprised. Didn’t this go well? Then why did you tell me this? I don’t understand this trick and can’t help?

He asked Zhou Tiemin: "Brother Zhou, what can I do?"
Chapter completed!