The military-industrial scientific research system of the academic master.

This time, when Chang Haonan finished speaking, the entire venue fell almost completely silent.

You can even clearly hear the uniform swallowing sound.

When the J-10 was originally designed, we did consider using the turbojet 15, which is a domestic model that imitates the R29 (the engine of the late MiG-23).

However, after entering the formal research and development process in the late 80s, the target installed power soon changed to the AL27FN, which is more realistic, has better performance, and is basically the same as the Su-31, another third-generation aircraft equipped by the Air Force.

Although it was just a standard third-generation turbofan engine, to the Chinese aircraft designers at that time, this engine with a military thrust of 7.5 tons at sea level and an afterburning thrust of 12.5 tons was definitely considered a It was a dream come true.

You know, the best engine China had installed and used at that time was the Spey imported from the United Kingdom. It had a thrust of 9 tons and the actual thrust-to-weight ratio was even less than 5.

Or the result after specially optimizing the sea level data.

The available thrust after installation is even lower.

In this way, the JH-7 finally built has been regarded as the model with the best air combat performance among Chinese domestic aircraft for a long time.

It wasn't until the J-8C entered service two years ago that there was a fighter that surpassed the fighter-bomber.

And its supporting power, the turbojet 14 that has now been installed on several other models, also proves that China has the ability to design and manufacture a high-performance aviation engine.

However, the Turbojet 14 can only be regarded as a second-generation mid-range model after all, and does not meet the basic requirements of Project .

In short, for the technicians present at the scene, before today, the upper limit of engine performance that could be achieved in their concept was the AL31FN, which is currently installed on two prototypes.

Including the Taihang engine, when it was originally planned, it was also a model with basically similar performance and could be replaced in situ.

but……

What's going on today?

Why is it different from what we agreed before?

On the PPT page that Chang Haonan turned to, a table and two performance curves clearly showed the difference between the turbofan 10B and AL31FN.

To put it simply, it is surrounded in all directions.

Except for the slightly higher afterburning fuel consumption caused by increasing the afterburning thrust and afterburning speed, all performance advantages are visible to the naked eye.

In fact, if we compare it with the slightly lower thrust turbofan 11A prepared for the J-10, then even the afterburner fuel consumption will be significantly lower than that of the AL31FN.

You know, the latter is already a model of the third-generation engine whose performance orientation is obviously towards supersonic speed and afterburning conditions.

Even the F110-GE-129EFE and AL41, which are half a generation ahead, dare not say they can surpass them in this regard.

What's more, the military thrust of turbofan 10B is also 8.4 tons.

Compared with the current model, it is also an improvement of more than 10%.

This means that although this model has enhanced high-speed working conditions, it still maintains fairly balanced performance.

In other words, compared to those third-and-a-half-generation engines that have exhausted their potential, the turbofan 10 in front of us is basically in the middle of the pack in paper performance, but it has not yet begun to exert its power...

before today.

Before Chang Haonan just cut out this page of PPT.

Who could have thought, or who dared to think, that China could have a three-and-a-half-generation aircraft engine at its fingertips?

"..."

Although aircraft design is a complex system engineering, it cannot simply be assumed that the better the power, the better the performance of the final aircraft.

But a high-performance aviation engine will definitely bring a higher degree of freedom to the entire project, allowing aircraft designers to maximize their talents.

Like a fish entering the sea, a bird ascending to the sky.

This feeling of being free from restraint highlights a sense of comfort.

About two minutes passed, and still no one spoke in the entire venue.

No one wants to break the feeling of happiness that everyone is immersed in at this moment.

"With this military thrust... only one for Project 10 is probably not enough, but if two are installed on Project 11, would it be possible to cruise at supersonic speeds..."

After a long time, Song Wencong finally spoke and broke the silence that had lasted for too long.

However, he still chose a slightly less relevant topic as an introduction.

Although it is also related to technology, it is not my own project after all, so it will be much easier to talk about it.

Chang Haonan pondered for a moment, then shook his head:

"If I must say it, at certain specific altitudes and with clean mounts, it is possible to reach a flight speed of around Mach 1 without using afterburner... Not to mention the twin-engine J-11, even the J-10 can do this. It’s possible.”

"When designing this engine, I took into account that the aerodynamic design of the third-generation aircraft was not optimized for long-term supersonic flight conditions, so I still had to take into account the subsonic conditions in most cases, and there was no way to avoid it. The afterburning speed under afterburner is set too high, otherwise the economical fuel consumption of the aircraft will not be improved, thus affecting the available combat radius. This is even more important for medium-sized aircraft like our Project 10. "

"For example, the American F22 has a lower combat radius and can use their hundreds of aerial tankers to make up for it. Our Chinese Air Force cannot have such a large tanker fleet in a short time, so... maintain a Basic voyage is still necessary.”

After such a round of questions and answers, the entire conference room finally returned to its previous working state.

"Comrade Haonan, is this engine...sure that it can catch up with the time limit of our No. 10 Project?"

Someone below raised their hands and asked.

Chang Haonan, who was sitting on the stage, just smiled.

Over the past two years, this has been one of the questions he hears most often.

The most fearful thing is having hope only to have it dashed later.

Just like what a worker hates most is a boss who makes plans but fails to realize them.

Originally, if I had been using AL31FN all the time, I wouldn't have felt anything.

But after seeing the data of the Turbofan 10 on the PPT, some people are even thinking about whether it can be used as a power to develop a fourth-generation fighter jet. It would be too uncomfortable to use the old model again.

Therefore, it is normal to have this sense of disbelief.

So, he adjusted his sitting posture and replied solemnly:

"Dear comrades of Project 10, the reason why I chose to come here at this time is because the overall design of the turbofan engine has been determined, and each component has completed trial production and component-level testing."

"In other words, the performance indicators reflected above are not empty design parameters, but... have been verified."

"There may be some fine-tuning of the parameters of the final product, but it is unlikely that there will be any major changes."

Chang Haonan's calm and serious tone made Chang Haonan exude a natural confidence when speaking.

And this kind of self-confidence will also subtly infect other people at the scene.

Unconsciously, everyone seemed to be sitting up straighter than before...

"Also, I can reveal a little more."

Chang Haonan glanced at the crowd at the scene, paused briefly and then continued to add:

"Currently, all parts of the turbofan 10 can be produced in our country, so... there is no need to worry about supply interruptions during production."

"Actually, the only problem currently is that domestic refining and chemical companies cannot immediately produce aviation fuel of high enough standards that meets the requirements of this engine... Of course, I have also reported this issue to the logistics department, and they It was promised that the problem would be resolved within two years.”

When he said this last sentence, the atmosphere that had become tense just now relaxed again, and even bursts of laughter broke out.

"In short, regarding the issue of power, you can rest assured that I, as well as my colleagues in the aerospace engine power field, can provide a strong heart for our third-generation aircraft!"

Chang Haonan said, turning the PPT to the next page and returning to the overall design of the Type II prototype of Project 10.

But this time, no one will question the feasibility of this improvement idea.

Everyone can already foresee that a fighter jet that is more advanced and comprehensive than the original one will be born in their hands.