Two months ago, the 624 Institute sent the approximate data of the core engine and a finished engine to Southwest Science and Industry, and Southwest Science and Industry also participated in the engine bidding for MPOC-75 together with this core machine and other semi-finished products of subsystems developed by Southwest Science and Industry and MTU.

It's been another two months, and it's been less than half a month since the last time Yang Hui came to the 624 Institute to participate in the first full-power operation of the core machine in the push, and the time given by the 624 should be just right.

As expected, when Yang Hui came to the data acquisition center next to the SB101 high-altitude platform in operation, he saw the last few tests of this core machine.

At the scene, Yang Hui still saw the white-haired Chief Wu Zhonghua for the first time, this big bull was found to have some early trends in the development of liver diseases to cancer after Yang Hui insisted on a comprehensive physical examination last time, and soon improved after cooperating with treatment.

Later, under the strong request of Wu Lao, he came to the 624 third-line poor ravine, and the environment of green mountains and green waters is very suitable for health preservation, and he is engaged in the work he loves, Wu Lao's body is quite tough.

"Master Wu! I'm here again this time, and I'm here for the 624 Cui project, I don't know if you can take out the core machine according to the progress you told me last time? ”

Yang Hui, who was originally quite young, looked very kind when he said this, and he felt like a little old man, but this action made my chief teacher laugh. Clamped the pen in his hand to the data recording board, patted the dust that did not exist on the white coat, and walked over to Yang Hui with a smile.

"Oh, come and take a look, our big financier is here to collect debts, and if we can't come up with a finalized core machine. This big boss Yang is going to prepare to give us a meal! What do you think is going to be good? ”

I didn't expect Wu Lao to be so humorous now, it seems that inviting Wu Lao to this 624 is indeed a good move, Yang Hui also feels a great sense of accomplishment at this point, and can save the next genius-like person, Yang Hui feels that this is not weaker than the satisfaction of the last turbofan 10 engine finalization.

With Wu Lao's smile and questioning, the disciples and grandsons who surrounded Wu Lao naturally replied to Wu Lao's words: "Teacher." Then give them a mature core machine, this is already the last point of the core machine life test, even if the core machine stops at the service life of our current test, our core machine can also achieve the required service life. ”

Yang Hui looked at this student of Chief Master Wu in surprise, and he didn't expect that the 624 Institute here had quietly come up with a core machine that met all the technical requirements, and it seemed that it would continue to carry out the life test, and it seemed that it could exceed the technical indicators.

"What does this comrade mean is that the current advanced medium push core machine has reached the technical data we require, and the life span can be improved, and now you are conducting the follow-up potential test of this core machine?"

Yang Hui didn't expect that the life of the core machine taken out by the 624 here was actually higher than the technical data required by the Southwest Science and Industry at that time. This is not so easy to do, it is necessary to know that when the Southwest Science and Industry and 624 agreed on the technical data of the core machine, it is to try to set the technical data as high as possible within the acceptable range, especially the requirements for life are set relatively high.

At that time, Southwest Science and Industry required the life of the core machine to use the unit design idea, the life of the core machine can reach 5000 hours, at that time, the 624 Institute also argued that this high index is difficult to complete, but I did not expect that now it can still exceed the task in terms of life.

Regarding Yang Hui's questions, Chief Master Wu couldn't help but uncover the mystery in person. After all, in Chief Wu's view, the design idea of this core machine is definitely quite advanced, although the life processing technology has not reached the forefront of the world. But world-class can be barely touched.

"When it comes to the life of this core machine, we still have to thank you for the long-life twin-rotor spindle manufacturing technology you got from GM last time, and we have to admire GM's deep technology accumulation, the spindle manufacturing technology they provide to produce the spindle life is three times the life of the spindle we can manufacture now."

When it comes to GM's technology, Wu Lao is still envious of the strong basic industry of the United States. As a world-class gas turbine engine expert, Wu Lao is very clear about the ability of a world-class giant like GM, and even this time GM is tired of playing on these technologies, Wu Lao also knows. But Wu Lao still chose to turn a blind eye, sometimes too advanced and prone to indigestion.

It's not that Wu Lao has received any benefits from GM, but that Wu Lao knows more clearly how the world's major aero engine manufacturers can make ultra-long-life aero engines. After clearly knowing the technologies used by GM, Wu Lao reached the stage of knowing himself and his opponent.

For example, this time, GM replaced the gold metal surface coating technology in the engine spindle manufacturing, and provided this metal surface coating technology not only to provide the special metal coating spraying process, but also to provide this surface metal material with super strong chemical properties.

The most important point is that this technology can not only be used on the spindle, but also in other engine components, although it cannot be used for the coating manufacturing of high-temperature turbines, but after the last three-stage high-pressure compressor has this coating, the comprehensive performance can be greatly improved, and as long as this technology has more excellent mechanical properties, the technology upgrade should not be too simple, and the general will not be so stupid.

In this case, GM changed the surface coating process to ultrasonic impact strengthening treatment, the effect of this process is weaker than GM's latest coating spraying technology, but it is not too weak, the most important thing is that this technology is difficult to upgrade, GM is naturally happy to come up with this technology.

Yang Hui naturally didn't know these things, just heard that the long-life spindle manufacturing technology he got from General last time played a great role in the manufacture of this core machine, Yang Hui can understand how much impact a long-life subsystem has on the overall core machine life in the unit design.

"That's what I said, but the spindle manufacturing technology given by GM can only reach 4000 hours, even if the unit design is used, I think after the life of a spindle is up, the life of other parts that have been replaced many times should be almost to the end of use, there is no need to replace the spindle for those small units that are also about to reach the end of life, right?"

Yang Hui here is looking at the approximate parameters of the core machine given by the last 624, and he also roughly calculated the service life of this core machine, and came to the conclusion that the service life of this core machine is just stuck to 4000 hours, which is more economical, as for the previous 5000 hours is just a goal, because irresistible factors need to give up.

Now according to the situation that Mr. Wu said, it is obvious that the life of the core machine wants to exceed the initial 5000 hours, and the only way is to change a spindle to continue to force the core machine to continue to live.

When Yang Hui frowned and asked this question, Chief Master Wu was very smart enough to understand Yang Hui's worries, and patted his head again, and then explained the mystery of the core machine to Yang Hui.

"What's going on with me, in fact, the core machine data we gave two months ago is not accurate, mainly because after we mastered the ultrasonic impact strengthening technology provided by GM, we expanded the use of this technology to the strengthening process of compressor blades and combustion chambers, so that the life of our compressors and combustion chambers has also been strengthened, which is different from the data provided to you last time."

After explaining the source of this problem, it was quite simple for Wu Lao to explain to Yang Hui why he wanted to replace the spindle and continue to use it.

"Now the core machine uses all the life of the first spindle, the compressor and core engine that have been replaced once have more than 1,800 hours of service life, for the sake of the economy of the engine, we can only replace the spindle and turbine to continue to use, according to our estimates, after the second spindle life is used, the most economical service life of the core machine can be achieved."

Yang Hui didn't expect that this thing was actually because of the long-life spindle manufacturing technology he came up with, which is really

It was a pleasant surprise, but the more such surprises the better.

However, after Yang Hui heard this ultrasonic impact enhancement, he always felt something familiar, as if the future of this ultrasonic impact enhancement seemed to be more than that, as if there was still an improvement plan for this ultrasonic impact reinforcement technology, as if (to be continued. )