The Military-industrial Scientific Research System of the Academic Master Chapter 475

Chapter 475 2-7-1-1 Engine Structure

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 two domestically produced third-generation main fighter jets, and possibly the power source for future naval main battleships, the importance of the turbofan 10 engine in China's equipment sequence goes without saying.

As the first aerospace engine model in China that is completely self-developed starting from the core aircraft, Turbofan 10 is also of great importance to the aviation industry system.

Taken together, the level of this judging panel made Chang Haonan himself, who was standing on the stage, feel that it was a bit exaggerated.

In addition to leaders and experts from the Science and Technology Commission and the General Armament Department, there are even higher-level figures in charge of science and technology participating.

For a project in the field of aviation power, this is definitely an unprecedented first.

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

In the eyes of most people, this probably just reflects the importance attached to the turbofan 10 by superiors.

But Chang Haonan knew more things after all.

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

Today's super-standard treatment, if you think about it further, seems to be regarded as the superior's emphasis on the entire aviation power system...

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

It is absolutely impossible to say that there is no pressure at all.

However, when the soldiers come to cover up the water and the earth, everyone is already here, and the review meeting will have to continue regardless of who comes.

Furthermore, Chang Haonan believes that it is impossible to find anyone in China who understands turbofan engine design methods better than him.

Confidence comes from professionalism.

Offsite, conference staff have begun distributing paper technical materials to all attendees.

Of course, those who are sitting in the back and listening will not get a share.

Fortunately, these people themselves are also R&D personnel participating in the Turbofan 10 project, and they are participating in an exceptional manner, so they can learn a lot.

In fact, according to the design review regulations, the review notice and necessary review materials should generally be sent to the review team members 3-5 days in advance to facilitate prior review by the review team members.

However, this notice conflicts with the confidentiality regulations in the military industry system. It is okay for ordinary projects. After all, the people who can participate in the review are not ordinary people. However, the more important and confidential the key projects are, the more difficult it is to obtain information. It was sent out in advance, so most experts only saw these materials for the first time when they arrived at the scene.

From a review perspective, this is of course problematic—

This time it is Chang Haonan who is in charge of the project. These details may not be important, but it may not be so if it is someone else next time.

However, it is not without its benefits.

That is to say, the effect of the program is absolutely full.

Because, everyone present, at least everyone who knew the technology, after getting the information and turning the first page, they all made a dumbfounded expression of surprise.

Since the information was distributed in order of seating, to Chang Haonan on the stage, it looked like a wave below.

The expressions of the big bosses changed gradually from curiosity to shock following the footsteps of the two field staff...

Especially a gray-haired middle-aged man sitting on the left side of the center of the expert seat. He was still leaning on the back of the chair in a relaxed state. However, after seeing the structural diagram of the turbofan 10 printed on the first page, he immediately became agitated. Vibrating, as if there were springs on the backrest, the whole person sat up straight in an instant.

He quickly picked up the ballpoint pen that was distributed with the information and counted it several times on the paper, muttering numbers like one, two, three, and four in his mouth.

“Level 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 table next to him:

“Academician Liu, have you given the technical information of R79 to Institute 606 for reference before?”

Liu Zhenxiang is naturally one of the very few reviewers who has seen the design plan in advance, so this effort is quite stable. Just 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 by looking at the expression of the person next to him, and combined with this somewhat nonsensical question, Liu Zhenxiang knew what the other person was thinking.

"Lao Jiang, take a closer look. Although the total levels are all 9, the R79 is 3-6-1-1, and this one is 2-7-1-1. The core machines are different (the core The machine only includes the high-pressure compressor, combustion chamber and turbine, the fan/low-pressure compressor is not included).”

Jiang Fuhe, the chief designer of the Gas Turbine Research Institute (624 Institute), presided over the design and development of the entire turbojet 13 engine model spectrum, and made a huge contribution to maintaining the basic combat effectiveness of the Chinese Air Force between the 1980s and 1990s.

Of course, in today's timeline, due to the branch of the Turbojet 14, newer aircraft no longer need the Turbojet 7/13 as power.

According to my country's practice of equipping one generation, developing one generation, and pre-researching one generation, now that the turbojet 14 has been officially equipped in the army, and the turbofan 10 is under development, it is natural that the fourth-generation aeroengine for the future will also start pre-research.

The person in charge of this preliminary research is Jiang Fuhe.

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

The design of the turbofan 10 has not been refined yet. What Chang Haonan drew on the document is just a schematic diagram. Its main function is to serve as a reference for subsequent component-level analysis. It is really unclear if you don't look carefully...

That's why I asked the question just now

Of course, when we really started working on the fourth-generation engine behind the 606 in our last life, we found that even if the core engine of the R79 was drained, it could only push the ratio to level 9. Then we had to start all over again, and finally experienced ninety-nine and eighty-one difficulties. Repairing the Turbofan 15 to its full potential is a story for another time...

“No…that's not the point…”

Jiang Fuhe turned over his head and found that it was exactly what Liu Zhenxiang said, but he quickly raised his head again:

“Isn't this a turbofan 10?”

"yes."

Liu Zhenxiang nodded.

“Isn't it a third-generation engine?”

"yes."

Continue to nod.

“But…this overall structure…is not…”

Jiang Fuhe raised his hand and showed four fingers:

“Not a typical... fourth-generation characteristic?”

By increasing the single-stage compressor pressure ratio to reduce the total number of compressor stages, thereby reducing the possibility of surge and the engine's own weight to improve the performance limit, this is a typical fourth-generation aeroengine idea.

It is impossible to achieve a thrust ratio of more than 10 for a third-generation aero-engine core engine relying on a traditional 8-stage or 9-stage high-pressure compressor.

Large-scale models generally use level 6 or 7, while medium-level models like the EJ200 do not consider the subsequent derivation of other models, and even adopt an astonishing 3-5-1-1 structure.

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

"Well...no one stipulates that third-generation aircraft engines cannot use some technologies of fourth-generation aircraft engines, right?"

Liu Zhenxiang touched his chin and replied:

“As for more detailed questions, you can ask Comrade Xiao Chang himself directly later.”

In fact, when he came here today, he was most interested in the overall design of the engine that looked very much like the fourth generation.

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

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　ifier

Jiang Fuhe leaned back on his chair again.

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

“Then our research progress at Institute 624 must be accelerated no matter what, otherwise... I'm afraid it won't be used...”

(End of this chapter)

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