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 domestic third-generation main fighter jets, and may also be 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 engine, the turbofan 10 is also very important to the aviation industry system.
The two factors were superimposed, and the level of this review meeting 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 were 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 that superiors attach to the turbofan 10.
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.
And today’s super-standard treatment, if you think about it further, seems to be regarded as the superior’s emphasis on the entire aerospace power system...
In other words, Chang Haonan’s performance today, It 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 must continue regardless of who comes.
Furthermore, Chang Haonan believes that it is impossible to find anyone in China who understands the design methods of turbofan engines better than him.
Confidence comes from professionalism.
Offsite, conference staff have begun to distribute paper technical materials to all attendees.
Of course, those 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 for review by the review team members in advance.
However, this notice conflicts with the confidentiality regulations in the military industry system. It is okay for ordinary projects. After all, those who can participate in the review are not ordinary people, but the more important and confidential the key points are. For projects, it becomes more difficult to send out information in advance, resulting in most experts seeing these materials for the first time when they arrive at the site.
From a review perspective, this is of course problematic -
Chang Haonan is in charge of the project this time. These details may not be important, but it may not be the case with someone else next time. .
However, it is not without its benefits.
That is to say, the effect of the program is absolutely amazing.
Because, everyone present, at least everyone who understands 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, mumbling numbers like one, two, three, and four.
"Level 9...Level 9?"
After being stunned for a while, he turned around and asked Liu Zhenxiang in a low voice, who was sitting in the middle of the expert table next to him:
< br>"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 skill is quite stable. But 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.
"Old Jiang, take a closer look. Although the total levels are all 9, R79 is 3-6-1-1, and this one is 2-7-1-1. The core machine They are all different (the core machine only includes the high-pressure compressor, combustion chamber and turbine, and the fan/low-pressure compressor is not counted). "
Jiang Fuhe, chief designer of the Gas Turbine Research Institute (624 Institute), He presided over the design and development of the entire turbojet 13 engine model spectrum, making great contributions to maintaining the basic combat effectiveness of the Chinese Air Force in 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 being developed, it is natural that the fourth-generation aeroengine should be oriented to the future. Preliminary research has begun.
The person in charge of this preliminary research is Jiang Fuhe.
For some reference, in 1996, the 624th Institute 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 fan The 3-6-1-1 structure of high-pressure compressor - first-stage high-pressure turbine - first-stage low-pressure turbine.
The design of the turbofan 10 has not been refined yet. What Chang Haonan drew on the data is just a schematic diagram. Its main function is to serve as a reference for subsequent component-level analysis. If you don’t look carefully, it is really unclear. Clear...
That’s why I asked the question just now
Of course, in my last life, when the fourth-generation engine was really started behind the 606, I found that even if the core engine of the R79 was drained, it could only reach level 9. Then I had to start all over again, and finally experienced the ninety-nine and eighty-one difficulties to cultivate the turbofan 15 into a positive result. That is all a story for another time...
"No...the point is not here..."
Jiang Fuhe turned over and found that it was indeed 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:
"Isn't it a typical... fourth-generation characteristic? ”
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.
It is impossible to achieve a thrust ratio of more than 10 by relying on the traditional 8-stage or 9-stage high-pressure compressor for the third-generation aerospace core engine.
Large-scale models generally use 6 or 7 levels, while mid-range models like the EJ200 do not consider the subsequent derivation of other models, and even adopt an astonishing 3-5-1-1 structure.
Coupled with reducing the number of removable parts and reducing the weight of supporting structural parts, a 10-level thrust-to-weight ratio was achieved under the dual constraints of cost and technology (although the cost was not limited in the end).
"Well...no one stipulates that the third generation aviation engine cannot use some technologies of the fourth generation aviation engine, right?"
Liu Zhenxiang touched his chin and replied:
< br>“As for more detailed questions, you can ask Comrade Xiao Chang himself directly later.”
In fact, when he came here today, what he was most interested in was the overall design of this engine that looked very much like the fourth generation.
You know, compared with the previous turbojet 14 compressor, it is not an exaggeration to say that it can reach the sky in one step.
“Hiss…”
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 we won't be able to use it..."
(End of this chapter)