In fact, as early as 1904, the German mechanologist Ludwig Plante (not Planck, who studied quantum mechanics, although both were German and lived roughly the same era) discovered in experiments with a surface layer around a cylinder that the separation of air flow could be delayed by actively adsorbing the surface layer.

It's just that until this time, no one has seriously considered applying this principle to the field of compressor design.

Some cutting-edge laboratories, including MIT, have only proposed relevant possibilities, and have begun to conduct some studies at the mechanism and feasibility level.

So you can't blame Liu Yongquan and others for not thinking about this level before.

After all, Chang Haonan introduced this ultra-high load adsorption bending and sweeping joint leading edge edge blade in the form of a "case study", and did not mention the specific application scenarios and basic principles of this thing.

And to be honest, it wasn't easy for the vast majority of the audience sitting down at the time to just understand how the blades were calculated numerically.

Those who can make a small half of a notebook like Liu Yongquan are already the best among them.

It's normal not to have time to think about it.

"The higher the entropy of the initial fluid before compression, the less work it will take to increase the same pressure on the same mass fluid in a multi-stage compressor, and the compression efficiency will also increase......"

"This is the formula of the Kármán momentum equation, and even without the aid of a computer, only from the theoretical level, we can find that when the attachment surface layer is well attached, the reduction in momentum thickness at a certain position downstream is the same as the decrease at the suction position; When the surface layer is nearly separated, the decrease in momentum thickness at a downstream position is magnified by an exponential factor compared with the decrease at the suction position......"

The basic principle of surface layer suction did not break through the content of ordinary physics in college, even when it came to engineering applications, everyone quickly understood what needs to be done next under Chang Haonan's explanation:

"So we have to find the specific location where the flow separation of the surface layer is happening, so that we can ...... Maximizing the efficiency of a single-stage compressor? ”

"That's right."

Chang Haonan nodded with satisfaction:

"There are currently two application directions of this technology, one is what I just said, the high tangential speed adsorption compressor can be used in the military small bypass ratio turbofan engine, with a first-stage adsorption fan instead of the original multi-stage fan, so as to reduce the weight of the fan and achieve a higher thrust-to-weight ratio."

"The second is the adsorption compressor with low tangential speed, which can be applied to turbofan engines with large bypass ratios, and realize the reduction of tangential speed and rotation speed of the blade tip under the same pressure ratio, and improve the vibration characteristics and acoustic performance of the engine......

"So before we start the overall design, we need to solve these technical problems......"

Haiyide next to him had already opened a notebook and started taking notes.

Although he is not the general person in charge of the technical level of the Taihang project, as the chief engineer, he will definitely not succeed if he does not understand the entire research and development process.

What's more, Haiyide itself is also from a technical background, even if he has been away from the forefront for a few years, the most basic sensitivity is still there-

With Chang Haonan's current rocket-like progress rate, after the completion of the turbofan 10 project, the other party will at least invest in the research and development of the next generation of aero engines, and may even directly do more basic and large-scale projects, and it is impossible to waste time on the design of other aviation engines of the same generation derived from the third-generation core aircraft.

At most, some technical guidance is provided.

The other party has just made it clear that the technology obtained in the research and development process of turbofan 10 has application value in a wider range.

Haiyide still has a relatively clear understanding of himself, and he knows that it is the limit for him to be able to make some achievements in the field of aviation power in his life, so after the completion of the turbofan 10 project, it is the time for their group of people who have participated in the turbofan 10 to show their strength.

As for now......

Listen well, learn well.

"It's just one of the key technical issues."

Chang Haonan put down the pen in his hand, and then said:

"Our foundation in aero engine development is really too thin, and there are many things that have no ready-made experience and data to follow, so we can only start from scratch, such as the new active cooling technology I just mentioned, which also needs the design team responsible for the turbine part to be responsible for research, as well as the receiver part...... Fortunately, there are relatively few problems in the combustion chamber and afterburner, and many of the technologies applied in the turbojet 14 can be directly followed. ”

"This is only the design level, the 410 factory is responsible for the production and manufacturing at the same time, especially the hot end components, single crystal turbine blades, and the main bearing of the entire engine, the working conditions are very poor, the manufacturing level determines how many cycles our engine can use, although the requirements for life can be relaxed under the premise of performance improvement, but the reliability can not be too low, after all, there is a single engine to use, this needs to be coordinated by the sea president, I may provide some help when necessary, But the main focus is still on basic research......"

……

Although it was only a small meeting of less than ten people, it still lasted a full afternoon.

In fact, Chang Haonan is equivalent to dismantling and assigning the work involved in the entire project.

"The whole project team is expected to be preliminarily divided into a total of nine technical directions of overall structural design, compressor, combustion chamber, turbine, fan, casing, other auxiliary components, cold working technology and hot working technology......

Chang Haonan stopped the pen in his hand and looked at Hai Yide next to him:

"Mr. Hai?"

After all, the other party is the chief engineer in charge of administrative leadership, and it is not easy for him to directly overstep his responsibilities in terms of personnel allocation.

At least be polite.

What's more, Chang Haonan himself is not an employee of the 606 Institute after all, and his previous contact with this side was limited to the Turbojet 14 project, so in terms of understanding the situation, it must not be comparable with the native Haiyide.

The latter then nodded:

"The backbone personnel in all directions, I will allocate them according to their previous work experience, especially the experience in the process of participating in the Kunlun project, as for the person in charge of each project......

When Haiyide said this, he lowered his head and thought for a moment.

The impact of this aspect is too great, even he can't give a list on the spot, not to mention that it also involves peers from other factories.

Although the 606 Institute is responsible for the general design, everyone is a brother unit after all, and if you really don't have any face, it will not be good.

"If you are in charge, I will first understand the specific situation in the next few days, and make a list of people with more relevant experience.

Haiyide was not polite before, he had a clear understanding of his position.

Considering the actual situation of the Taihang project, no matter who will be the chief engineer, he is mainly responsible for providing administrative support.

As well as back pots.

So he still handed over the decision of the key position to Chang Haonan.

"That's fine, the complete task assignment plan will be determined at the all-staff meeting next week."

Chang Haonan closed the previous notebook and handed it back to Liu Yongquan:

"But before that, the research work in several key directions should be started as soon as possible, in addition, I will personally be responsible for the two directions of turbine and thermal processing technology, as for the compressor, I think it can be handed over to Comrade Liu Yongquan, what do you think?"

The latter, who was suddenly called by name, didn't even react immediately.

Until Haywell called his name again:

"Yongquan, make a statement?"

"Guaranteed to complete the mission!"

(End of chapter)