Generally speaking, small meetings are held for big things, and big meetings are held for small things.

But this time, it was a big event.

As the heart shared by the two domestic third-generation main fighters, and may also be the power source of the main combat ships of the Navy in the future, the importance of the turbofan 10 engine in the Huaxia equipment sequence is needless to mention.

As the first type of aero engine model in China that has been completely self-developed from the core engine, the turbofan 10 is also very important for the aviation industry system.

Under the superposition of the two, the level of this review meeting made Chang Haonan standing on the stage feel a little exaggerated.

In addition to the leaders and experts of the two systems of the Commission of Science and Technology and the General Armament Department, there were even higher-level figures in charge of the field of science and technology.

This is absolutely the first of its kind for a project in the field of aerodynamics.

In the past, only key main battle equipment could enjoy the same level of treatment.

In most people's eyes, this probably just reflects the importance that the superiors attach to the turbofan 10.

But Chang Haonan knows more things after all.

About two and a half months ago, the reform plan of the Aviation Industry Corporation jointly submitted by him, Du Yishan, and Liu Zhenxiang involved splitting it into two group companies, Aviation Industry and Aviation Power.

And today's over-specification treatment, if you think about it further, seems to be able to be regarded as the superior's attention to the entire aviation power system......

In other words, Chang Haonan's performance today is likely to affect the future development trend of the entire industry.

To say that there is no pressure at all, it is absolutely impossible.

However, the soldiers will block the water and cover the earth, and the people are already here, and whoever comes will have to continue to hold this review meeting.

Moreover, Chang Haonan believes that it is impossible to find a person in the whole of China who knows more about the design method of turbofan engines than him.

Self-confidence comes from professionalism.

Off the floor, the conference staff has begun to distribute paper technical materials to all those attending the meeting.

Of course, those who sit in the back will not be able to tell.

Fortunately, these people themselves are also R&D personnel involved in the turbofan 10 project, and they are exceptionally involved and can learn the counting points.

In fact, according to the design review regulations, the review notice and necessary review materials should generally be sent to the members of the review team 3-5 days in advance, so that the members of the review team can review in advance.

However, this notice conflicts with the confidentiality regulations in the military industrial system, which is fine for general projects, after all, the people who can participate in the review are not ordinary people, but the more important and confidential the key projects, the more difficult it is to send the information in advance, resulting in the vast majority of experts only seeing these materials for the first time when they arrive at the scene.

From the point of view of the review, this is of course problematic -

It is Chang Haonan who is in charge of the project this time, and these details may not be important, but it may not be necessary to change someone else next time.

However, it is not without benefits.

That is, the effect of the show is absolutely full.

Because, everyone present, at least everyone who understands technology, after getting the information and turning the first page, all made a stunned and surprised expression.

And because the information is distributed in order of seats, in the eyes of Chang Haonan on the stage, the following is like a wave.

The expressions of the bigwigs changed from curiosity to shock with the footsteps of the two field staff......

In particular, a gray-haired middle-aged man on the left side of the middle of the expert chair was still leaning on the back of the chair in a relaxed state, but after seeing the schematic diagram of the turbofan 10 structure printed on the first page, the whole person shook directly, as if a spring was installed on the backrest, and the whole person sat up straight in an instant.

He quickly picked up the ballpoint pen that was sent down with the information next to him, and repeated the count on the paper several times, still muttering the numbers one, two, three, four.

“9…… Level 9? ”

After being stunned for a while, he turned around and whispered to Liu Zhenxiang, who was sitting in the middle of the expert seat next to him:

"Academician Liu, have you given the technical data of R79 to the 606 Institute for reference before?"

Liu Zhenxiang is naturally one of the very few reviewers who have seen the design plan in advance, so this effort is still stable.

It's just that a few days ago, when he took out this information from the confidential document bag for the first time, his expression was not much different from that of his current colleagues.

So just looking at the expressions of the people next to him, combined with this somewhat nonsensical question, Liu Zhenxiang knew what the other party thought.

"Old Jiang, take a closer look at it later, although the total number of stages is 9, but R79 is 3-6-1-1, this is 2-7-1-1, and the core machine is different (the core machine only includes a high-pressure compressor, combustion chamber and turbine, and the fan/low-pressure compressor does not count)."

Jiang Fuhe, chief designer of the Gas Turbine Research Institute (624 Institute), presided over the design and development of the entire turbojet 13 engine spectrum, which made great contributions to maintaining the most basic combat effectiveness of the Chinese Air Force between the 80s and 90s.

Of course, at this point in the timeline, the newer model of the aircraft no longer needs the Turbojet 7/13 as a power due to the props of the Turbojet 14.

According to the practice of China's equipment generation, R&D generation, and pre-research generation, now that the turbojet 14 has been officially equipped with the troops, and the turbofan 10 is being developed, it is natural for the future-oriented fourth-generation aero engine to start pre-research.

The person in charge of this pre-research is Jiang Fuhe.

For some reference, in 1996, the 624 Institute obtained part of the technical data of the R79V-300 engine from the Tumansky Design Bureau, and its most obvious structural feature is the 3-6-1-1 structure of the three-stage fan, the six-stage high-pressure compressor, the first-stage high-pressure turbine, and the first-stage low-pressure turbine.

The design of the turbofan 10 has not yet been refined, and what Chang Haonan drew on the data is only a schematic diagram, and the main function is to make a reference for the component-level analysis later......

That's why I just asked

Of course, when the 606 in the previous life really started to work on the fourth-generation engine, it was found that the core engine of the R79 could only be pushed to the 9th level even if it was squeezed dry, and then it had to start all over again, and finally experienced 9981 difficulties to repair the turbofan 15 to a positive result, then it was all a later story......

"It's not...... The point is not ......"

Jiang Fuhe flipped back and found that it was indeed as Liu Zhenxiang said, but he quickly raised his head again:

"Isn't this a turbofan 10?"

"That's right."

Liu Zhenxiang nodded.

"Isn't it a third-generation engine?"

"That's right."

Keep nodding.

"But this ...... This overall structure...... It's not ......"

Jiang Fuhe raised his hand and gestured four fingers:

"Not typical...... Fourth-generation features? ”

Reducing the total number of compressor stages by increasing the single-stage compressor pressure ratio, thereby reducing the possibility of surge and the dead weight of the engine to improve the performance limit, is a typical fourth-generation aero engine idea.

Relying on the traditional 8-stage or 9-stage high-pressure compressor of the third-generation aviation engine core aircraft, it is impossible to achieve a push ratio of more than 10 in any case

The big push generally uses 6 or 7 stages, while the EJ200 does not consider the subsequent derivation of other models at all, and even adopts the amazing 3-5-1-1 structure.

Combined with the reduction of the number of detachable parts and the reduction of the weight of the supporting structure, a thrust-to-weight ratio of 10 levels was achieved under the dual constraints of cost and technology (although the cost was not limited in the end).

"Is this...... There is no one who stipulates that the third generation of aviation development cannot use some of the technology of the fourth generation aviation development, right? ”

Liu Zhenxiang touched his chin and replied:

"As for more detailed questions, you can ask Comrade Xiaochang directly later."

In fact, he came here today and was most interested in the overall design of this engine that looked very fourth-generation.

You know, compared with the previous turbojet 14 compressor, it is not an exaggeration to say that it will reach the sky in one step.

"Hiss......"

Jiang Fuhe leaned back in his chair.

As an aviation development expert, he can naturally see at a glance that due to the leading structure of the core aircraft, this turbofan 10 actually has the potential to be directly improved into a fourth-generation engine.

"Then the research progress of our 624 Institute must be accelerated no matter what, otherwise...... I'm afraid I won't need ......."

(End of chapter)