Chapter 793 Why Not Let the French Be the Guinea Pigs?

Chapter 793 How about...let the French be the guinea pigs?

Due to the existence of the J-11WS verification aircraft, even the lurking party near Beiling Airport can hardly tell with the naked eye that the No. 1121 prototype 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 WS-10 support technical team to remove the storage device that recorded the working status of the aeroengine.

Soon, the relevant data was sorted into the software program that had been designed long ago.

"Take a look at the data of the deformation sensor on the outer side of the annular casing."

Chang Haonan stood behind the operator, staring at the computer screen, and asked.

Every 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 WS-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 the upgraded fuselage, the engine's fixing method and support position have changed.

According to calculations and the Su-27SM's previous test of the AL31F, these modifications should not affect normal operation.

But the specific degree of adaptation still needs to 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, half bent over and almost put his face in front of the screen.

After all, the shape of the vibration curve is thin, dense and fluctuating, which is indeed not very friendly to a middle-aged man with a little dizziness.

"Well... at least that's the case from the amplitude point of view."

The operator nodded and replied:

"The maximum displacement has not changed significantly over time. Only during the mid-flight roll, the fluctuation was slightly larger, but it still only reached..."

Here, he enlarged the data curve:

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

"Well... it seems that the previous strength margin was a bit too much."

Chang Haonan hesitated, touching his chin.

In the field of aviation, things related to structure are basically not the stronger the better.

Including static destructive tests on aircraft, the greater the force, the better.

Instead, it is to reduce redundancy as much as possible while meeting the design.

Because this is the most direct way to reduce 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 just now. After all, for computers of this era (even supercomputers), the amount of data to be processed is really not small.

Fortunately, the final result was no risk.

Although there are still larger overload conditions to be tested later, Chang Haonan still breathed a sigh of relief.

"Perhaps we can consider working on the casing wall?"

Liu Yongquan next to him also stood up again and asked Chang Haonan:

"For example, use a thinner shell, and then add reinforcement ribs to maintain strength, which can at least reduce the weight by a hundred kilograms. When I was making the design plan before, I remember that a group had done research in this area."

"There is no rush for this."

Chang Haonan waved his hand:

"Not to mention that our research on the thin-walled structure of the casing is not sufficient. Even if it is designed, the diamond-shaped reinforcement ribs need to be milled on a large area of ​​the casing after casting. We don't have such a large milling machine or related milling processing technology. If we rashly use new technology, it may affect the mass production progress of the turbofan 10."

On this timeline, China did not purchase the 124 Su-300MKK/MKK2, so there is a great demand for domestically produced third-generation aircraft in the short term.

In addition, the WS-10 is the first key model to enter mass production after the establishment of the Aviation Power Group.

Therefore, when the performance of the engine itself meets the requirements, the highest priority at present is to put it into production as soon as possible.

No matter how good the group's annual report is, it is not as convincing as delivering the J-11B and J-10A equipped with the WS-10 to the troops as soon as possible.

Again, the superiors also have to face pressure when making drastic reforms.

As one of the biggest beneficiaries of the reform, the Aviation Power Group needs to give feedback to the superiors as soon as possible to prove that their decision is correct.

"However."

After a pause, Chang Haonan changed the subject:

"Research in this area can be continued with some funding, and when we really develop the fourth-generation aircraft engine, it will definitely be useful."

Chang Haonan stretched his muscles while speaking.

At this moment, an idea suddenly popped up in his mind.

When designing WS-10, many new technologies were verified on WS-9.

But after the A/B models of WS-10 were finalized, there is a high probability that there will be no more WS-9-like things in China to practice with.

But if things don't go well in the east, they will go well in the west...

It seems that there is a solution.

"You can try it on M88..."

Liu Yongquan, who was putting on his coat, naturally heard this.

He asked curiously:

"I heard some time ago that the French didn't seem to have much sincerity and kept delaying the time?"

Chang Haonan smiled and shook his head:

"That was true at the beginning, but recently their attitude has changed 180 degrees. They have already talked to us about the specific way of cooperation. I guess they want to blackmail China, but the Americans didn't pay any attention to them."

Dassault and Snecma asked China to cooperate in the development of turbofan engines. Because the former did not keep it secret, not to mention Liu Yongquan in the Aviation Power Group, even the outside world has already had various rumors and discussions about this matter.

However, because the source of the news was on the other side of the ocean and the statement was not very clear, most people directly guessed the wrong direction -

They all thought that it was similar to the situation of the turboshaft 8 a few years ago, and the French wanted to transfer the technology of the M88 engine to China.

But there seemed to be no model in China that required high-performance medium thrust as a power source.

Therefore, the direction of discussion soon turned to the possibility that China might develop a new model.

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

The range of speculation ranged from the ultimate major modification of the J-8 to the enlarged version of the dual medium thrust of the J-10, and then to the possibility that China might develop a medium-sized fourth-generation aircraft...

In short, it became more and more outrageous.

It's true. Although it's all just a guess, there was an imaginary picture of a twin-engine J-10 in the weekly public opinion trend briefing that Zhang Liangping gave to Chang Haonan. It is really similar to the second version of the J-10 design that is currently being manufactured...

"If this thing can really work, it would be nice to let the French be guinea pigs."

Liu Yongquan said as he opened the door for Chang Haonan, and then the two left the engine room together:

"I have seen some photos of M88 at the air show before. Judging from the parts that can be seen with the naked eye, the overall design is still relatively conservative, but it should be that a lot of effort has been put into the materials, so the declared temperature before the turbine is very high, leaving us a lot of room for play."

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

"Engineer Liu."

After a few seconds, Chang Haonan suddenly said:

"If the M88 project can be successful, considering the R&D experience, the main body of external cooperation will still be your 606 Institute."

"So, based on your personal wishes, after the WS-10 has completed the finalization process, do you want to continue to work on the improved model or aero-fuel conversion, or help Snecma optimize the M88?"

This question stumped Liu Yongquan.

He had never thought about it.

When he first joined the newly established Taihang project as the deputy chief designer of the model, Liu Yongquan had even made the mental preparation of "devoting the remaining 20 years of his career to this model, as long as he can see it mass-produced and installed before retirement."

After all, Chief Designer Chang Haonan is younger than him, and the way of waiting for the chief designer to retire and then taking over as the chief designer like most of his predecessors is obviously not feasible.

As a result, plans cannot keep up with changes.

Before he was ready to be a deputy chief engineer for life, the thing he needed to consider had already become "what are you going to do next after the WS-10 is finalized."

He was familiar with the WS-10, and with the design foundation of the "3.75 generation core engine" laid by Chang Haonan, there would not be too much risk.

But it would be a lie to say that he was not interested in the M88.

"Forget it."

Chang Haonan waved his hand:

"There is no rush for this, you should consider this issue first, and give me a result before the end of the year."