Chapter 477 Let’s work hard on vertical takeoff and landing
最开始的时候，常浩南确实设计出了完整的3-7-1-1结构，甚至直接把海平面推重比拉到了9.5-10.5的惊人水平。
It's completely a fourth-generation engine.
But he soon realized that even if he cheated, it would be impossible to actually create this thing in a short period of time.
So we simply made some fine-tuning and performance compromises, and removed one stage of the fan, resulting in a somewhat peculiar 2-7-1-1 structure.
Of course, even so, the overall performance of this turbofan 10 is enough to be among the best among today's military aviation engines.
Anyway, it's definitely no problem to sit five and look three.
Chang Haonan's statement directly messed up the atmosphere of the entire design review meeting.
What's the point of reviewing this?
Learn from it.
Like the active control technology of blade separation flow mentioned by Chang Haonan just now, such as boundary layer suction, this technology is still in the process of installation and testing in traditional aviation powers.
To be honest, others are experimenting and we are still on the drawing board, so we are indeed still a few years behind.
But on the one hand, judging from the current catching up speed of China, it is still unclear who can use these technologies first.
On the other hand, just being a few years behind was something that would have been unimaginable for China's aviation engine field in the past.
After all, just two years ago, what everyone was thinking about day and night was how to narrow the gap to less than 20 years!
The best turbojet 13 in China at that time was, to put it bluntly, just a limited improvement of the R11F300.
Even when the turbojet 14 was in service, although it made rapid progress, it was mainly due to the low starting point. Just building something would be a huge leap...
However, this turbofan 10, although it is still on the PPT, at least in terms of the overall plan, it is already the top level.
Of course, the review meeting must continue.
However, the 1250c turbine front temperature mentioned later and the related technology of full-coverage air film cooling of these hot-end components are not so shocking in comparison.
Not that it's not important.
mainly……
Already numb.
There is no longer the feeling that Grandma Liu entered the Grand View Garden at the beginning...
For other attendees sitting further back in the venue, Chang Haonan’s paragraph also made quite a few of them realize for the first time what a huge project they were participating in——
Yes, in fact, for a highly complex project, most screw-type participants may not know what they are doing until the end of the project.
This doesn’t even have anything to do with confidentiality. The same goes for many civilian projects that are not classified.
This is just a side effect of the highly specialized social division of labor.
"Let's go, Lao Zhou, I just know that the design goal of our turbofan 10...is it so exaggerated?"
Taking advantage of an expert group discussion session, engineer Lin Zhibing, who was sitting in the back seat in the middle, finished adding the notes he had just jotted down in sketch, rubbed his aching hands and said to another companion next to him.
However, he didn't get any response for a long time after he finished speaking.
When he raised his head and looked up, he realized that the other person was still concentrating on writing something in the notebook at hand. Apparently, he didn't hear clearly what he was just saying.
"Old Zhou? Lianhong?"
After shouting several times, it was obviously the companion named Zhou Lianhong who finally reacted:
"what happened?"
Lin Zhibing was helpless and had no choice but to repeat what he had just said and take a look at the contents of the other party's notebook.
It is indeed what Chang Haonan just talked about, the thermodynamic model and the like.
But around these contents, there are many annotations and sketches densely marked.
"This is……"
Both of them are from Jianning, Hunan Province, but Lin Zhibing is the engineer in charge of technology at Factory 331, while Zhou Lianhong is an aviation engine designer at Factory 608.
They had met at work before, and they were transferred together to participate in the Taihang project. They became familiar with each other over time. However, Lin Zhibing, who was born as a worker, obviously did not understand these contents as well as his friends.
"Oh, I just listened to what Mr. Chang introduced and I have some thoughts. I think it can be used in our work over there."
Zhou Lianhong answered, but the pen in her hand never stopped:
"Isn't Bingcheng Aircraft Group been anxious for a higher-power engine in the past two years? It's for the Z-9 carrier-based version. I have some ideas, so I quickly jotted them down."
Jianning-based Southern Aviation Power Machinery Co., Ltd. is mainly responsible for the R&D and manufacturing of turboshaft and turboprop engines.
Of course, these two types of aircraft engines with output shaft power are different from turbofans in many ways. For example, the compressors are both axial flow and centrifugal hybrid structures, but they are always the same in terms of the most basic thermodynamic principles.
"Hasn't the Turboshaft 8E been delivered to them?"
Lin Zhibing was stunned.
"It's not enough. The Turboshaft 8E needs take-off power to allow the Z-9 to maintain a hovering state in combat, but the take-off power can only be used for 5 minutes at most. It's okay for transporting people, but it's definitely not enough for anti-submarine warfare."
Zhou Lianhong shook his head and replied:
"So now we are walking on two legs. On the one hand, we are considering introducing the newer Arriel 1M1. On the other hand, we are also striving to improve ourselves on the basis of the turboshaft 8E. After all, foreign exchange is limited and the French ask for high prices. It’s not an option to always look for them…”
……
The whole morning meeting agenda was quickly over.
Firstly, the leaders did not understand the specific technical details behind it, and secondly, they had other things to do, so they would leave Shengjing one after another at noon.
But the expert team still has to stay for two more days.
Although everyone is not confident enough to review the Turbofan 10 now, even from the perspective of long-term experience, this process must be completed.
During the break after lunch, Jiang Fuhe found Liu Zhenxiang alone.
"Old Dean, in this situation, our institute's highly recommended pre-research project... the next step..."
He did panic a little.
The progress of your "pre-research" is slower than that of other people's officially approved models, so you still need to do pre-research.
However, the funds for R79 technical data were raised by 624 itself. If this pre-research project does not go forward, it will definitely suffer a loss.
But if we bite the bullet and continue, the sunk costs will only get bigger and bigger...
"My suggestion is to change the focus of research."
After all, Liu Zhenxiang has worked in the 624 Institute for decades, and he still understands the basic situation of the old unit.
Judging from Chang Haonan's incredible ability, since he has left room for upgrades in the core machine of the Turbofan 10, it is definitely not a lie.
Breakthroughs in materials and processes will of course be much slower in comparison, but in terms of difficulty, it is not that high. As long as enough resources are invested, many things will come naturally.
By that time, this 3.75-generation engine will naturally evolve into a serious fourth-generation engine.
Judging from the capabilities of the 624th Institute, it can be said that it has come from behind in the field of core aircraft research and development, pushing the improved turbofan 10 out of the position of the fourth-generation aviation engine...
It is indeed that difficult.
Then we can only avoid its edge.
"Transform...to where?"
Jiang Fuhe couldn't follow Liu Zhenxiang's train of thought for a while.
"With high-thrust engines, judging from the current situation of the Taihang project, there should be no need to continue working on this line."
The latter had no choice but to explain further:
"But the power system of the R79 can also take off and land vertically. I have seen the design of the three-bearing rotating vector nozzle. It is quite advanced. You can work hard in this direction next..."
"This……"
The idea of vertical takeoff and landing power was indeed something Jiang Fuhe had never considered.
Mainly based on the strength of China Aviation Industry in the past, let alone the Yak 141, it is very difficult to even copy a Harrier.
Moreover, the performance of vertical take-off and landing aircraft in all aspects is bound to be far weaker than ordinary fixed-wing aircraft with the same technical level.
For the Chinese Navy and Air Force, which have not even retired first-generation fighter jets such as the J-6, it is unlikely that they will rush to pour a large amount of resources into this field.
But the past is the past and the present is the present.
If we want the R79's technical data to continue to shine, I'm afraid this is the only way to take an eccentric approach.
