Chapter 1042

"Chief, don't worry, it's enough!" Zhuang Jianye whispered back.

"En ~ ~" the head of the headquarters nodded and did not say anything else, because at this moment, those aviation experts behind Abdallah and Mahmoud have flocked to the samples of the "honeycomb combustor". One of the middle-aged experts from Algeria asked the staff of the take-off group: "can I take it down and have a look?"

The staff did not dare to agree immediately, but looked at Zhuang Jianye. After Zhuang Jianye nodded and agreed, they said, "yes, sir."

"Thank you The middle-aged expert politely nodded his head, then went forward, carefully took down the "honeycomb combustion chamber" from the display platform, and then put it in his hand to pad, his eyes suddenly widened: "this combustion chamber is very light."

"It should be light, the key is how the process holes are distributed inside."

"Yes, the combustor is mainly the cooling structure of the flame tube, and the process hole in the cooling structure is the key."

"Yes, the technological hole is the key. It has nothing to do with light."

……

As soon as the middle-aged experts' voice fell, they were ridiculed by other experts for a while. There was no way. If other people were holding metal parts that were much lighter than they thought, they would have to sigh for a while. But all the people present were professionals in the aviation field. The parts on the aero-engine should be light, otherwise, how could you make them fly into the sky.

So these people simply went beyond the boring problem of light and not light, and directly focused on the key point, that is, the process hole on the flame tube of the aero-engine combustion chamber.

As a heated part of the engine, the performance of aero-engine combustion chamber is directly related to the overall performance of the engine, especially the full combustion of aviation fuel, which is the key index of almost all aero-engines.

The problem is that in order to fully burn, the temperature in the combustion chamber will rise sharply, and the highest temperature will reach nearly 2000 degrees Celsius. Ordinary metal parts can't support at such a high temperature.

what should we do?

Then we can only find a good way to efficiently cool the combustion chamber.

Inspired by the film cooling on the turbine blades, engineers wondered whether a film cooling structure could be engraved in the flame tube of the combustion chamber, that is, the external cold air was sucked in to form a film cooling layer on the inner wall of the flame tube, so that the temperature of the inner wall of the flame tube could be maintained at a stable value of 1000 to 1200 degrees Celsius, and the normal operation of the whole could be ensured.

In theory, this kind of film cooling is feasible, but if the film cooling structure of turbine blade is directly copied to the flame tube, it will be 100%.

It's not that the method is wrong, but because the whole combustion chamber also involves the key process of burning fuel. If the air inhaled impacts the fuel combustion while forming a gas film, affecting the direction and temperature of heat flow, the performance of the engine will not be improved, but will be greatly attenuated.

Therefore, the film can not impact the high-temperature flame, it can only be tightly attached to the inner wall of the flame tube, just as the real film completely separates the high-temperature flame from the inner wall of the flame tube.

The most ideal state is that the cold air rotates clockwise around the inner wall, and the strong centrifugal force adheres the cold air to the inner wall of the flame tube, while the high-temperature flame burns fully in the middle to push the turbine behind to do work.

The problem is that it's not easy to achieve such an effect. The key is the dense technological holes on the flame tube, which may seem like honeycombs to outsiders. The technological holes that make people with phobia get goose bumps when they see them are just like that. They can be drilled out with any iron shell.

But in the eyes of real senior people, every hole above is particular. At least, the position and direction are determined after complex calculation and test. Otherwise, it is impossible for these holes to form a tornado like rotating film on the inner wall of the flame tube.

Of course, computing is not the key, the important thing is how to process, which is a great test of an enterprise and even a country's manufacturing industry.

After all, the theory of aero-engine combustor flame tube is very simple, and even the calculation of each hole is not difficult to determine. Even an undergraduate of general aerodynamics can easily handle all this. But once it is implemented in the manufacturer, it can be a large number of enterprises or even countries.

Because the machining accuracy and quality requirements of this process hole are very high, the error range can not be greater than 0.1 μ m, that is to say, the error must be maintained below 100 nm.

Yes, it is correct to read that the accuracy of such process holes can be calculated in nanometers.

This is no way, because once the error is too large, it may cause the air flow into the disharmony, thus affecting the overall performance.

Therefore, this kind of hole can not be made by the teacher Fu with years of experience. It must use ultra-high precision equipment, top technology and amazing stability to make this kind of hole which can be called art.

It is so difficult that only general motors and Pratt & Whitney can make such process holes in the world, and these two aviation giants are all from the United States. In other words, only American talents have such production equipment and process capacity.So GM's ge-90 can make Boeing 777 lead the fashion; so Pratt Whitney's f-119 can make F-22 have the advantage of rolling.

Because these two engines use such process holes, so as to reduce the overall weight of the combustion chamber, at the same time, make the fuel burn more fully, improve the temperature in front of the turbine, and finally improve the overall thrust of the engine.

If the manufacturing technology in Europe and Russia is not up to standard and the honeycomb shaped process hole can not be made, the temperature of the combustion chamber can only be reduced, thus the thrust can not be increased.

Although the experts from UAE and Algeria are not top-notch, they also know the technological development direction and technological trends of the world's aeroengine. Therefore, when they know that the combustor displayed by Tengfei group is honeycomb, they can't wait to see if the process holes inside are embroidered pillows.

You know, there are many people who have visited the details of the American f-119 aeroengine. It's OK to fool outsiders and fool them No way.

As a result, the middle-aged expert with the combustor said so by the experts around him. He fumbled carefully, then moved a few buckles and slowly pulled out the flame tube inside. When he held the flame tube in his hand, held his glasses and looked at the dense technological holes on the outside, his head only felt a buzz: "my God, This hole It turned out to be It turned out to be Micro precision... "