Chapter 87 The Problem of Aviation Power

On the other side, Ho Jing, Yan Liang.

After completing the analysis of the engine surge failure, Chang Haonan finally found time to rest for a few hours.

It is estimated that some comrades of the power joint research group are still inspecting and analyzing the damage to the No. 01 prototype in order to confirm the specific impact of the failure and to rule out other possible causes of the accident, which is estimated to wait until tomorrow morning.

Of course, this job does not need Chang Haonan to complete.

But his mission is far from over.

Finding out the problem, after all, is only the first step in a long journey.

Again, it's all about solving problems.

Although the turbojet engine compressor and the air conditioning fan he studied before can be classified as "impeller machinery", the difference between them is similar to that of the Flyer 1 and An-225, which also belong to the category of "aircraft".

Chang Haonan, who had had dinner, was walking around Yanliang's factory and thinking about the plan for the future.

With his work card on his chest, he can naturally move freely around the entire area, and only a few buildings or rooms require additional permissions, and normal walks are obviously impossible, and there is no need to go to that kind of place.

So along the way, Chang Haonan's thinking was completely focused on things about aero engines.

The current design system of turbomachinery has always followed the traditional idea of "steady wall flow pattern".

However, once the flow separation caused by the diffused flow in the compressor occurs, it is no longer within the scope described by the flow pattern described above.

Since the situation outside of the wall flow was not taken into account from the beginning, it was almost inevitable that the flow would be disturbed or out of control in the non-designed state.

From this point of view, the most direct and effective way is to change the blade design to increase the stall margin and delay the occurrence of flow separation.

In particular, the Turbojet 14 is an existing design, and if it is to be modified, the original design idea must be retained.

After a period of research on the bending blades, Chang Haonan is confident that this problem can be solved quickly, as long as the efficiency of the 410 factory, which is responsible for engine manufacturing, can keep up, it will not have a particularly significant impact on the progress of the 83 project.

However, for the Huaxia Air Force, which is about to enter the era of third-generation aircraft, the turbojet-14 can only be a transition after all.

It cannot hold up the skies of a great power in the future.

Chang Haonan's thoughts involuntarily flew farther away.

J-10 and J-11, the target power of both third-generation aircraft is the same.

Turbofan 10.

But to borrow a popular joke on the Internet before he was reborn.

Did the 1996 turbofan 10 come?

- As it comes.

It's really like that.

At this time, nearly 10 years have passed since the establishment of the turbofan 10 project, but what about the progress of the project itself......

Basically, there's no progress.

Or rather Schrödinger's progress.

The turbofan 10, which was established in 1987, developed almost simultaneously with the turbojet 14.

In the case that it can be said that there is no experience in engine design, even second-generation engines such as the turbojet 14 have obvious traces of patchwork reference, let alone the situation of the turbofan 10.

Although the design objectives and design locations were not changed many times like the Turbofan 6, the overall design plan was inevitably reversed many times.

Even the original case was changed halfway.

And this kung fu turbofan 10 should be in the process of zeroing out the design scheme at a certain time.

Actually, this is also normal.

After all, there is a limit to the flow pattern of the stationary wall attached to the wall mentioned above, and it is almost impossible to design a compressor with a high pressure ratio and a high load under this theoretical basis.

Because there are two sides to the matter of flow separation.

Chang Haonan revisited the field of aircraft design, which he was more familiar with and more experienced.

About 20 years ago, the design idea of aerodynamic distribution of aircraft shape has crossed from "steady possession flow pattern" to "stationary/de-body vortex mixed flow pattern".

That is, from "inhibiting flow separation" to "using flow separation"——

Intentionally, the large angle of attack of the aircraft is detached, and the concentrated vortex generated by the flow separation is used to obtain additional vortex lift, which not only greatly improves the lift of the wing, but also greatly expands the angle of attack range of the wing, so that the performance of the aircraft has a leap.

Reflected in the product is the stage at which the fighter evolved from the second generation aircraft to the third generation aircraft.

"Can you introduce this idea into the aerodynamic design of the compressor?"

This thought jumped into Chang Haonan's mind almost without warning.

Of course, it's difficult.

Because it is necessary to fully understand the internal flow of the blade grid, especially the law of separation flow.

A universal path taken by scientific research institutes is to move from complex to simple and from simple to complex.

First, the concrete natural phenomena are abstracted into a relatively simple model, and a basic understanding is obtained after research, and then the assumptions are gradually abolished, and the basic understanding is modified and expanded, until a comprehensive understanding of the complex concrete phenomena is finally obtained.

Typical examples range from Newtonian classical mechanics and Maxwell's classical electromagnetism, to relativity and quantum mechanics.

Nowadays, in terms of the flow of the surface layer, it happens to be in the stage of "going from complex to simple".

In the case of numerical simulation, it is probably only possible to achieve two-dimensional constant calculation, and there is even some distance from the quasi-three-dimensional.

Thinking of this vast amount of knowledge, Chang Haonan's brain was faintly swollen.

He wasn't a big bull before he was reborn, and he only knew a lot of things but didn't know why.

And the above is only a problem in the field of aero-engine compressor design.

In addition, there are combustion chambers, turbines, fans, bearings, tail nozzles......

After the design is completed, it needs to be implemented into manufacturing.

……

There is no doubt that the capability of the system is strong, but there are also two limitations, one is the integration requirement, and the other is that you need to have a certain theoretical foundation first, and complete the basic idea framework construction before you can form the project.

Although at the beginning of his rebirth, Chang Haonan had already realized that his own strength alone was completely insufficient.

But he still underestimated the speed of the pressure.

"Whew-"

Chang Haonan exhaled a long breath of turbidity.

"There has to be a team, and it has to be a team dominated by me."

In addition to the "output" process of promoting the new models and theories he has researched, he also needs an "input" process.

That is, let someone else be responsible for constructing the basic framework of thought, or at least provide him with sufficient theoretical knowledge.

Opening the system panel and looking at the engineering experience that only had level 1, Chang Haonan shook his head self-deprecatingly.

Before I was reborn, I only brought a small project with no more than 4 people including myself.

After being reborn, he has only brought Lin Shikuan and a few of them so far.

There is progress, but not enough.

Thinking of this, he stopped and prepared to walk back.

The current work to improve Turbojet 14 seems to be a good opportunity.

(End of chapter)