Chapter 793 How about... Let the French be used as guinea pigs?
Due to the existence of the J-11WS verification aircraft, even the Wancao Party lurking near Beiling Airport can hardly tell with the naked eye that this prototype No. 1121 is a brand new model.
Therefore, the arrangement of the entire test flight process is relatively low-key.
Before the celebration banquet in the evening, Chang Haonan led the on-site turbofan 10 support technical team to remove the memory that recorded the working conditions of the aviation engine.
Soon, the relevant data was organized into the already designed software program.
"Look at the data from the deformation sensor on the outside of the ring casing."
Chang Haonan asked, standing behind the operator with his eyes fixed on the computer screen.
Each test flight generates a massive amount of data, and it is impossible to analyze each item in detail.
For example, the basic working status of the engine has been verified in the previous bench test and installation test. As long as the data is within the normal range and there is no alarm, there is no need to conduct in-depth analysis again.
After the turbofan 10 was installed on the J-11B, Chang Haonan’s main concern was the vibration during flight and the strength of the engine itself——
In order to adapt to this upgraded body, the fixing method and supporting position of the engine have been changed.
According to calculations and Su-27SM’s previous testing of the AL31F, these modifications should not affect normal operation.
But the specific degree of adaptation can only be known by looking at the data.
Soon, the deformation curves of several key points appeared on the computer screen.
“It should be... much better than expected?”
Liu Yongquan, who was standing on the other side of the operator, was half-bent, almost putting his face in front of the screen.
After all, the shape of the vibration curve is thin, dense and fluctuating, which is really not friendly to a middle-aged man who is a little dazzled.
"Well...at least from the amplitude point of view."
The operator nodded and replied:
"The maximum displacement does not change over time. There were obvious changes. Only the fluctuations were slightly larger during the flying roll in the middle, but it still only reached..."
Having said this, he enlarged the data curve:
“It has reached 23% of the allowable deformation corresponding to the G value.”
“Well...it seems that the previous strength margin is left. A bit too much."
Chang Haonan hesitated, touching his chin.
In the aviation field, when it comes to structure-related things, stronger is not always better.
Including static damage tests on aircraft, the greater the force it can withstand, the better.
Instead, reduce redundancy as much as possible while meeting the design.
Because this is the most direct way to lose weight.
"Compare the waveforms at different positions to see if there is any risk of resonance."
Chang Haonan's tone was flat, and no emotion could be heard.
This time it took a little longer than before. After all, for computers in this era (even supercomputers), the amount of data to be processed is really not small.
The good thing is that the final result is no risk.
Although there are still greater overload conditions that need to be tested in the future, Chang Haonan still breathed a sigh of relief.
“Perhaps we can consider working on the casing wall?”
Liu Yongquan standing next to him also stood up straight again and asked Chang Haonan:
"For example, changing to a thinner shell and adding stiffeners to maintain strength can reduce at least a hundred kilograms of weight. When I was making design plans before, I had the impression that a group had done research in this area."
“This is not urgent at the moment.”
Chang Haonan waved his hand:
“Not to mention that our research on the thin-walled structure of the receiver is not sufficient yet, even if it is designed Yes, the diamond-shaped ribs also require large-area precision milling of the casing after casting. We do not have such a large-scale milling machine at hand, nor do we have the relevant milling processing technology. If we rush to introduce new technologies, it may affect the quality of the turbofan 10. Mass production progress. "
In this timeline, China has not purchased the 124 Su-300MKK/MKK2, so there is a huge demand for domestic third-generation aircraft in the short term.
In addition, the Turbofan 10 is the first key model to enter mass production after the establishment of the Aerospace Power Group.
So, when the performance of the engine itself meets the requirements, the highest priority work at present is to put it into production as soon as possible.
No matter how beautiful the group's annual report is, it is not as convincing as delivering the J-11B and J-10A equipped with turbofan 10 to the troops as soon as possible.
Again, superiors also have to face pressure when making drastic reforms.
As one of the biggest beneficiaries of the reform, the Aerospace Power Group needs to give feedback and confidence to its superiors as soon as possible to prove that their decision is correct.
"However." After a brief pause, Chang Haonan changed the topic again:
"Research in this area can be given some funding to continue. When we really develop the fourth generation aviation engine, we will definitely be able to It will come in handy."
Chang Haonan stretched his muscles as he spoke.
At this moment, an idea suddenly came into his mind.
When the Turbofan 10 was designed before, many new technologies were verified on the Turbofan 9.
However, after the design of the A/B models of the Turbofan 10 is finalized, there is a high probability that there will not be a Turbofan 9 in the country that can be used for practice.
But the east is not bright and the west is bright...
It seems that there is no solution.
“You can try it on M88...”
Liu Yongquan, who was putting on his coat, naturally heard this sentence.
He asked curiously:
"I heard some time ago that the French don't seem to be sincere and have been delaying time?"
Chang Hao Nan smiled and shook his head:
"It was indeed like this at the beginning, but recently their attitude has turned 180°. They have already talked to us about specific cooperation methods. They probably want to take advantage of China's self-respect. As a result, The Americans paid no attention to them.”
Dassault and Snecma approached Huaxia to cooperate in the development of turbofan engines because the former did not keep it secret. Therefore, let alone Liu Yongquan within the Aerospace Power Group, even the outside world has already had various rumors and discussions about this matter. .
It’s just that because the source of the news is on the other side of the ocean and the statement is not very clear, most people directly guessed in the wrong direction——
They all thought it was similar to the situation of Turboshaft 8 in previous years. , it is the French who want to transfer the M88 engine technology to China.
But there seems to be no model in China that requires high-performance mid-range propulsion as power.
Therefore, the direction of the discussion quickly changed to the possibility that China would develop new models.
At this point, it has nothing to do with the real world.
The speculation ranges from the final overhaul of the J-8, to the enlarged version of the J-10 with dual mid-range thrusters, to the possibility that China will develop a medium-sized fourth-generation aircraft...
In short, it is becoming more and more popular. Outrageous.
Not to mention, although it is all just guessing, Zhang Liangping’s previous weekly public opinion briefing to Chang Haonan contained an imaginary picture of a twin-engine J-10, which is similar to the J-10 currently being manufactured. The designs of the second version are so similar...
"If this can really happen, it would be good to let the French be the guinea pigs."
As Liu Yongquan spoke, he opened the door to Chang Haonan, and then the two of them left the computer room together:
"I have seen some photos of M88 at air shows before. Judging from the parts that can be seen with the naked eye, The overall design is still relatively conservative, but a lot of effort should be made in materials, so the temperature in front of the turbine is claimed to be very high, leaving us with a lot of room for development.”
This judgment is consistent with Chang Haonan’s previous judgment. The idea was similar, causing the latter to turn his head and look at Liu Yongquan, and then suddenly slowed down.
“Liu Gong.”
After a few seconds, Chang Haonan suddenly said:
"If the M88 can be successful, considering the research and development experience, the main body of external cooperation must be your 606 Institute."
"So, starting from your personal wishes, after the turbofan 10 has completed the finalization process, Do you want to continue to develop improved models or aerospace modifications, or help Snecma optimize the M88? "
This question directly stopped Liu Yongquan.
He didn't think about it at all.
When he just joined the newly established Taihang project as the deputy chief engineer of the model, Liu Yongquan had even prepared to "dedicate the remaining twenty years of his career to this model, as long as he can see it before retirement." The psychological preparation is that it will be ready for mass production and installation.”
After all, the chief engineer Chang Haonan is younger than him. The approach of retiring the chief engineer and then taking over as chief engineer, as most seniors did, is obviously not feasible.
As a result, the plan could not keep up with the changes.
Before he could mentally prepare to be the deputy chief engineer for the rest of his life, the thing that needed to be considered had already become "What are you going to do next after the turbofan 10 is finalized?"
Continuing to work on the Turbofan 10, he is familiar with the road. With the design foundation of the "3.75 generation core machine" laid by Chang Haonan, there will not be too much risk.
But to say that I am not interested in M88 is definitely false.
"Forget it."
Chang Haonan waved his hand:
"There is no rush now. You should consider this issue first and just give me the result before the end of the year."
(End of Chapter)