Chapter 614 The Heart of the Chinese Fighter
This time, when Chang Haonan finished speaking, the entire venue fell into almost complete silence.
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 1980s, the target installed power soon changed to the AL31FN, which is more realistic, has better performance, and is basically the same as the Su-27, 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 must know that 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.
This is the result of specially optimized 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 aircraft that surpassed the fighter-bomber.
What's more, the military thrust of turbofan 10B is also 8.4 tons.
means that although this model has enhanced high-speed working conditions, it still maintains a fairly balanced performance.
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.
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.
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.
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.
However, the Turbojet 14 can only be regarded as a second-generation mid-range thruster after all, and does not meet the basic requirements of Project 10.
Before Chang Haonan just cut out this page of PPT.
Who would have thought, or who dared to think, that China could have a three-and-half-generation aircraft engine at its fingertips?
Before today.
On the PPT page that Chang Haonan turned to, a table and two performance curves clearly show the difference between the turbofan 10B and AL31FN.
What is going on today?
Why is it different from what was promised before?
but…
Compared with the current model, it is also an improvement of more than 10%.
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.
You must know that the latter is already a third-generation engine whose performance orientation is obviously towards supersonic and afterburning conditions.
Including the Taihang engine, when it was originally planned, it was also a model with basically similar performance and could be replaced in situ.
In other words, compared to those third-and-half-generation engines that have exhausted their potential, the turbofan 10 in front of us is basically on par with performance on paper, but it has not yet begun to exert its power...
In fact, if we use the slightly lower thrust turbofan 10A prepared for the J-11 for comparison, even the afterburner fuel consumption will be significantly lower than that of the AL31FN.
Even F110-GE-129EFE and AL41, which are half a generation ahead, dare not say they can surpass them in this regard.
Simply put, it means to be surrounded in all directions.
Like a fish entering the sea, or 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.
"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 broke the news. The silence went on for far 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 and 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 about Mach 1 without using afterburner... This is not to mention the twin-engine J-11, even the J-10 is possible. accomplish."
"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 The 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 that is dashed later.
Just as what workers hate most is the boss who has made plans but cannot realize them.
Originally, if I had been using AL31FN all the time, I would not 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. It would be too uncomfortable to use the old model again.
So, it is normal to have this unbelievable sense of illusion.
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 10 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.”
“The parameters of the final product may still have some fine-tuning, but it is unlikely that there will be any major changes.”
The calm and serious tone makes Chang Haonan exude a natural confidence when speaking.
This kind of confidence will also subtly infect other people at the scene.
Unconsciously, everyone seemed to be sitting a little straighter than before...
“Also, I can reveal something else.”
Chang Haonan glanced at the crowd at the scene, paused briefly, and then continued to add:
“At present, all parts of the turbofan 10 can be produced in our country, so... there is no need to worry about supply interruption 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 promised The problem will be solved within two years.”
When he said this last sentence, the atmosphere that had gradually become tense relaxed again, and even burst into bursts of laughter.
“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 as he turned the PPT to the next page and returned to the overall design of the Type II prototype of Project 10.
It's just that 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 more comprehensive than the original one will be born in their hands.
(End of this chapter)
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