Chapter 1798 Misunderstandings in the study of aircraft engines

"In other words, all key technologies have made great breakthroughs now. The rest of the work is to integrate these technologies into our fighter jets. Once our fighter jets fly, the technical performance will not fall behind too much?" Long Yaohua's voice was filled with a hint of excitement.

This is the best news he has heard this year.

What I heard before was that various technologies have developed to the point and are subject to basic limitations.

Now that we have basically made breakthroughs in various sub-field technologies, we need project integration.

"Chief, this is how the relevant technologies of Project No. 10 are in addition to the power system..."

When Boss Song said this, he stopped immediately.

It’s completely different that the pot is not open to the open.

Even though you know that the power system cannot keep up, the engine cannot do it.

The group did not stay in Factory 132 for too long, so they went directly to Dongfeng Power Plant.

In recent years, Dongfeng Power Plant has developed rapidly, especially among its 404 subsidiaries, many of its products require engines, which has allowed this enterprise, which was composed of several engine units that were on the verge of bankruptcy, to develop rapidly.

The engines used for engineering equipment are being developed and produced by Dongfeng Power Plant; the engines used by automobiles are also being developed and produced; the solid fuel engines used by missiles and rockets are also being developed and produced.

However, everyone in this unit knows that the greatest significance of their existence is to develop turbofan engines used for aviation equipment!

It is also a turbofan engine, which has always been something that Dongfeng Power Plant cannot make a breakthrough.

"The turbofan-6g has been undergoing improvement and intensive experiments. Although it can be put into use, its service life still cannot exceed 300 hours. According to national standards, it can be put into use, but the cost..." Liao Dongfeng did not receive any news before.

Faced with a group of bigwigs and Xie Kai, who helped promote the restructuring of Dongfeng Power Plant, Liao Dongfeng said that there was no pressure and that was impossible.

The Turbo Fan-6g is the engine of the Super-7A and Super-7B self-used fighter aircraft. It was already about to succeed. Now the 404 has invested a lot of money and poached people everywhere. All kinds of supporting production equipment are given priority.

As a result, the engine service life is still not improved.

Not to mention the turbofan-6g, even the development of the turbofan-10 core machine hosted by the Ministry of Industry and other departments, Dongfeng Power Plant is also a major unit, and the progress is also not large.

The Super-7 self-use model has no useful engine; the No. 10 project has no supporting engine; the Y-10 can only import the US jt3d engine, and the domestic turbofan-8 engine that imitates this engine, and the Dongfeng Power Plant also did not make much breakthrough.

"reason?"

Xie Kai had known the situation for a long time.

Engines are still the biggest problem in the development of the domestic aviation industry.

"If the heart disease problem in the aviation industry is not solved for a day, our aviation industry will be restricted."

This is not alarmist, it is something that everyone knows in their hearts.

"There are problems with materials and craftsmanship, and there are also problems with design improvement..." Liao Dongfeng didn't know why Xie Kai asked knowingly, especially in front of the leaders, he still answered honestly.

Long Yaohua and Li Mingshan looked at Xie Kai without saying a word.

This kid is so bad.

Want to force the leader to express his opinion.

Can this statement solve the problem?

So, the two of them didn't say anything.

"What's going on with the core machine at the moment?" Xie Kai saw that the two big shots were not deceived, so he could only change the topic.

"After starting to produce the prototype, what is the specificity? It is unknown at present. You need to wait for the sample to be completed for a test run and evaluation..." Sun Hong looked at Xie Kai and replied, "Consultant Xie, this is our work has not met expectations..."

As chief engineer, Sun Hong knows how much confusion their work has not made in the current breakthroughs.

"Your work is excellent. We have high requirements now and our foundation is too weak." Li Mingshan still couldn't help it. "Aero engines involve too many basic fields, and many of these fields were blank in China before. We also don't have much foundation for turbofan engines. If it is not for higher requirements, in order to reduce the cost of use, the current turbofan-6g can be practical."

The turbofan-6g was originally designed to match the J-9.

The engine used for high-altitude high-speed fighter jets is naturally different from the engine used by the Super-7, which requires comprehensive combat capabilities.

To be used for Super-7 self-use models, the turbofan-6g also requires a lot of design modifications.

Although it is still the name of turbofan-6g, it should actually be called turbofan-6gg or something.

The turbofan-6g was originally a modification of the turbofan-6, but now the Dongfeng Power Plant is a modification of the turbofan-6 modification.

"Go to the workshop and the laboratory to have a look." Long Yaohua suggested in a low voice.

In the conference room, it's useless.

You must watch it on site and understand the real progress.

If you only listen to reports and read reports, it is useless and you have to bring out something.

"Let's go to the engine test laboratory first." Liao Dongfeng asked the leaders what they meant.

The leaders naturally did not object.

Engine test drive is divided into several stages.

The Super-7A assembled by Turbofan-6g has long been produced in small batches and is provided to the Blue Army's air force for flight tests.

"Boom~"

Still outside the laboratory, a faint roar came into everyone's ears.

You can even vaguely feel the vibration of the ground.

"Extra-long test drive experiment?" Xie Kai asked Sun Hong next to him.

The latter nodded: "The biggest problem with our engine at present is that its service life is not long. Now the main experiment is to continuously test runs for a long time to find the most suitable materials and production processes."

When Sun Hong explained, his voice was quite loud, and the big guys around him could hear it clearly.

"I haven't found the right materials and craftsmanship yet, and the test run must be carried out. The consumption of aviation fuel per month only costs more than 20 million..." Liao Dongfeng looked heartbroken.

This is still for Long Yaohua and Li Mingshan to listen to.

The amount of test funds for Dongfeng Power Plant is not small.

If the fuel consumption in a year is only 30 to 20 million yuan according to the experiment method of other power research units, their method is to find out the problem after the experiment, improve it, and then continue the experiment.

The 404 has sufficient funds and the demand for engines is relatively urgent, so several engines are often tested at the same time.

Use funds to speed up R&D progress.

"What is the import temperature?" When Xie Kai saw from the glass wall of the laboratory where the test bench was located, the flames ejected by the engine inside were not blue, he was a little disappointed.

He is not an expert, so he can determine whether the engine is strong and directly look at the color of the flame.

The color of the flame also represents the combustion temperature. The combustion temperature determines the efficiency of the engine and determines whether the power is strong.

"The front end temperature is 1420c and the combustion chamber temperature is about 1780c. If it is too high, the materials used in the combustion chamber inside the engine will melt under long-term high temperature work. This is the problem that has always troubled us..." Sun Hong explained to Xie Kai and others.

"The temperature is not low." Xie Kai was a little confused.

The temperature before the al-31 engine is about 1392c; the front end temperature of the turbofan-10 is only about 1377c. The temperature before the turbine of these engines is lower than that of the current turbofan-6g. Why is the combustion efficiency not so high, and the thrust-to-weight ratio generated is not satisfactory?

Sun Hong introduced the current parameters and data of WS-6g to everyone, while Xie Kai was trapped in his own thinking.

Xie Kai didn't know much about the engine.

I don't understand, but I have many articles in my mind about these aspects.

He tried his best to think about what was in his mind.

It's hard to remember if you don't think about it normally.

The turbofan engine is a shortcoming part of the entire aviation industry. There are many articles introduced in China in this regard, not only introducing various structures, but also comparing them with various international engines.

According to the requirements of engine development, especially advanced fighter jets, the power requirements for engine capacity are increasing, which makes engines that want to meet advanced fighter jets, they must have stronger thermal power, that is, higher air intake temperatures.

The higher the temperature of the air inlet, the higher the heat resistance of the materials used in the hot end of the engine.

In terms of materials, China is also a weakness. Even though the formulation of high-temperature alloys has made considerable progress in the development of powder metallurgy technology, the gap is still very large compared with the international one.

These advanced materials are impossible to import.

Otherwise, the Ministry of Industry and other departments would not take the initiative to help take the responsibility when 404 proposes to build core machines.

A breakthrough in a project brings breakthroughs in the entire related field.

"Thermal power conversion... If the material cannot keep up, too high temperature will lead to a decrease in propulsion efficiency. The inlet temperature of turbofan-6g is higher than that of turbofan-10, but the thrust-to-weight ratio is much worse... What is the problem?" Xie Kai forgot his environment and murmured to himself, thinking about the information he remembered in his mind.

"To comprehensively improve engine efficiency, we should not only increase the intake temperature one-sidedly and increase the thermal efficiency. This will only put higher requirements on materials and production processes... To solve it, we should seek a balance between thermal efficiency conversion and propulsion efficiency. Domestic research has always been misunderstood in this regard, and I understand..."

When Xie Kai spoke, his voice suddenly became much louder.

He finally remembered the reason.

In China, there is not much foundation and experience in the research and development of turbofan engines. At the beginning, it was always believed that increasing the intake end temperature could make the engine more efficient.

To increase the temperature, heat-resistant materials must continuously improve their heat resistance.

No matter how strong the material is, it will be consumed quickly when it continues to work in high temperature environments.

Seeing him like this, the people around him stared at him directly.

"What misunderstanding?" Sun Hong asked Xie Kai in confusion.

The others also looked at Xie Kai.

Xie Kai is not an expert in the field of engines.

"In our current direction, we are just constantly increasing the front end temperature of the engine, and we can't find the right material at all, especially what we need is to make the engine service life exceed 1,000 hours..." Xie Kai was a little proud.

If this is true, the problem of turbofan-10 will be solved.
Chapter completed!