Chapter 417 Construction officially begins!

In fact, as early as 1904, the German mechanic Ludwig Prandtl (not the Planck who studied quantum mechanics, although both men were German and lived roughly in the same era) was working on the flow around a cylinder. In layer experiments, it was found that air flow separation can be delayed by actively pumping the adsorbent surface layer.

But until now, no one has seriously considered applying this principle to the field of compressor design.

Some cutting-edge laboratories, including MIT, have only proposed related possibilities, and have successively begun to conduct some research on mechanisms and feasibility.

So we can’t blame Liu Yongquan and others for not thinking about this before.

After all, Chang Haonan introduced this ultra-high-load adsorption-type curved-sweep combined leading edge edge blade with a "calculation example" before, and did not mention the specific application scenarios and basic principles of this thing.

And to be honest, for the vast majority of the audience sitting below, it was not easy to just understand the numerical calculation method used in the blade design process.

Those who can produce as little as half a notebook like Liu Yongquan are already among the best.

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

“Boundary layer suction can remove the high-entropy and low-energy fluid in the compressor. The lower the entropy value of the initial fluid before compression, the more work it takes to increase the same pressure of the same mass of fluid in a multi-stage compressor. less, the compression efficiency will also increase..."

"This is the formula of Karman's momentum equation. We don't even need the assistance of a computer. By deriving it from a theoretical level, we can find that when the boundary layer is well adhered to the suction, the decrease in the momentum thickness at a certain position downstream and the suction The amount of decrease is the same at the position; while when the boundary layer is near separation, the decrease in momentum thickness at a certain position downstream is magnified by an exponential factor compared to the decrease at the suction position..."

The basic principles of boundary layer suction did not break through the content of ordinary undergraduate physics. Even if it involves engineering applications, everyone quickly understood what needs to be done next under Chang Haonan's explanation:

"So we must find the specific location where flow separation occurs in the boundary layer, so that we can... improve the efficiency of the single-stage compressor as much as possible?"

"Yes."

Chang Haonan nodded happily:

"This technology currently has two application directions. First, as I just said, high tangential speed adsorption compressors can be used in military small bypass ratio turbofan engines, using one-stage adsorption fans to replace the original multi-stage fans. This reduces the weight of the fan and achieves a higher thrust-to-weight ratio.”

“The second is the low tangential speed adsorption compressor, which can be applied to turbofan engines with large bypass ratios to reduce the tip tangential speed and rotational speed under the same pressure ratio, improving the vibration characteristics and acoustic performance of the engine. Of course, , this should be a matter of the future for us..."

"So before carrying out the overall design, these technical problems must be solved first..."

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

Although he is not the technical person in charge of the Taihang project, as the chief engineer, he certainly cannot understand the entire research and development process.

What's more, Haiyide himself also has a technical background. Even though he has left the forefront for a few years, his most basic sensitivity is still there——

With Chang Haonan's current rocket-like progress, after completing the Turbofan 10 project, the other party will at least invest in the research and development of the next generation aeroengine, and may even go directly to a more basic and larger-scale project. It is impossible to waste time on personally designing other aircraft 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 acquired during the research and development of the Turbofan 10 also has application value in a wider range.

Haiyide still has a relatively clear understanding of himself. He knows that his ability to make some achievements in the field of aviation power in this life is already the limit, so after the turbofan 10 project is completed, they will participate in this batch. It’s time for people who have passed Turbofan 10 to show their talents.

As for now...

Listen well and learn well.

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

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

"Our foundation in aero-engine development is indeed too thin. There is no ready-made experience and data to follow for many things. We can only start from scratch. For example, the new active cooling technology I just mentioned also requires the design team responsible for the turbine part. I am specifically responsible for research, as well as the casing part... Fortunately, there are relatively few problems with the combustion chamber and afterburner, and many technologies applied to the turbojet 14 can be directly used."

"This is just 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 bearings of the entire engine. The working conditions are very harsh, and the manufacturing level determines How many cycles can our engine be used? Although the life requirements can be relaxed on the premise of improving performance, the reliability cannot be too low. After all, there are single-engine aircraft to use. This needs to be coordinated by Mr. Hai. I may We will provide some help when necessary, but the main focus must still be on basic research..."

……

Although it was only a small meeting with less than ten people, it still lasted for an entire afternoon.

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

"The entire project team is expected to be initially divided into nine technical directions: overall structural design, compressor, combustion chamber, turbine, fan, casing, other auxiliary components, cold processing technology and hot processing technology to carry out work at the same time. There are also nine technical directions below each direction. They need to be divided into different groups according to specific topics. As for the selection of key members in each direction..."

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

"Mr. Hai?"

After all, the other party is the chief engineer responsible for administrative leadership. In terms of personnel allocation, it is not easy for him to directly overstep his authority.

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 place was limited to the Turbojet 14 project. Therefore, in terms of understanding of the situation, he is definitely not comparable to the native Haiyide.

The latter nodded immediately:

"I will assign the key personnel in each direction based on their previous work experience, especially the experience in participating in the Kunlun project. As for the person in charge of each topic..."

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

The impact of this aspect is so great that even he cannot come up with a list immediately on the spot, not to mention that it also involves colleagues from other factories.

Although the 606th Institute is responsible for the overall design, we are all brothers in the unit after all. If you really don't save any face, it will not be good.

"As for the person in charge, I will first understand the specific situation in the next few days and make a list of people with more relevant experience. Why don't we decide the specific candidates at that time?"

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

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

And taking the blame.

So he still left the decision-making power of key positions to Chang Haonan.

"That's fine. The complete task allocation plan will be finalized at the all-staff meeting next week."

Chang Haonan closed the notebook in front of him and handed it back to Liu Yongquan:

"But before that, the research work in several key directions must 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 I can leave it to Comrade Liu Yongquan. What do you think? ?”

The latter didn't even react immediately when his name was suddenly called.

Until Haiyide called his name again:

"Yongquan, show your attitude?"

"Guaranteed to complete the mission!"