Chapter 793 Should the French be used as guinea pigs?

Due to the existence of the J-11WS verification aircraft, even the undercover 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 annular receiver."

Chang Haonan stood behind the operator, eyes fixed on the computer screen, and demanded.

Each test flight generates a huge 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 still needs to be seen from the data to know.

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 person who is a little dazzled.

"Well...at least judging from the amplitude."

The operator nodded and replied:

"The maximum displacement did not change significantly over time. It only fluctuated slightly during the intermediate flying roll, but it still only reached..."

Speaking of which, he enlarged the data curve:

"It has reached 23% of the allowable deformation corresponding to the G value."

"Hmm... It seems that the previous strength margin was a bit too much."

Chang Haonan touched his chin and hesitated.

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 locations to see if there is any risk of resonance."

Chang Haonan's tone was calm, 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.

Fortunately, the end 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 could consider doing some work on the casing wall?"

Liu Yongquan 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 100 kilograms of weight. When I was making design plans before, I remember that there was a group that did 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. Even if it is designed, the diamond-shaped ribs will still require large-area precision milling of the receiver after casting. We do not have such a large volume on hand. The milling machine does not have the relevant milling processing technology. The rush to adopt new technologies may affect the mass production progress of the turbofan 10. "

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.

Therefore, 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-10B and J-11A 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.

"but."

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, it will definitely be used."

Chang Haonan stretched his muscles as he spoke.

At this moment, an idea suddenly popped 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 no longer be a Turbofan 9-like thing in China that can be used for practice.

But the east is not bright and the west is bright...

There doesn't seem to be a 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 are delaying time?"

Chang Haonan smiled and shook his head:

"That was indeed the case at the beginning, but recently their attitude has turned 180°. They have already talked to us about specific ways of cooperation. They probably want to take advantage of China's self-respect. As a result, the Americans ignored them at all."

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 that similar to the situation with the turboshaft 8 in previous years, the French wanted to transfer the technology of the M88 engine to China.

But there seems to be no domestic model that requires high-performance mid-range propulsion as power.

Therefore, the direction of the discussion soon turned to the possibility that China would develop new models.

At this point, it has nothing to do with the real world.

Speculations range 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 getting more and more outrageous.

Not to mention, although it is all just guesswork, Zhang Liangping’s weekly public opinion briefing to Chang Haonan contained an imagined picture of a dual-engine J-10, which is really similar to the second version of the J-10 prototype currently being manufactured. There are so many similarities...

"If this is really going to happen, it would be better 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 the M88 at air shows before. Judging from the parts that can be seen with the naked eye, the overall design is relatively conservative, but it should be that a lot of effort has been made in materials, so the temperature in front of the turbine is claimed to be very high, leaving It gives us a lot of room to play.”

This judgment was similar to Chang Haonan's previous thoughts, which caused the latter to turn his head and glance at Liu Yongquan, and then suddenly slowed down.

"Liu Gong."

After a few seconds, Chang Haonan suddenly said:

"If M88 can be successful, considering the research and development experience, the main body of foreign cooperation must be your 606 Institute."

"So, based on your personal wishes, after the turbofan 10 completes the finalization process, do you want to continue to develop improved models or aeroderivatives, or do you want to help Snecma optimize the M88?"

This question directly stopped Liu Yongquan.

He didn't even think about it.

When Liu Yongquan had just joined the newly established Taihang project as the deputy model chief engineer, Liu Yongquan had even prepared to "dedicate the remaining twenty years of his career to this model, as long as he could see it mass-produced and installed before retirement." psychological preparation.

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 a deputy chief engineer for a lifetime, the thing he needed to consider 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.

"never mind."

Chang Haonan waved his hand:

"There is no rush now. You can consider this issue first and just give me a result before the end of the year."