The temperature of the engine is as high as thousands of degrees, how to cool is a technical job, for example, the highest temperature component in the aircraft is the turbine blade, in order to improve the turbine blade by 100 degrees, it took more than ten years in China to develop the air-cooled turbine blade, which has reached the standard of the same level as abroad.

This blows air into the turbine blades, which forces heat dissipation.

And in the engine compartment, there is also such equipment.

The engine is high-temperature, put such two engines in the tail, directly wrap them, put heat insulation measures, the heat just can't be dissipated, this is not the best way.

If the rear fuselage can be forcibly cooled, the cooling universal valve opening can be increased, and the cooling air flow path can be adjusted, this may be a better solution.

"Qin Feng, this proposal of yours is good!" Mr. Gu said: "Such a solution should be more appropriate, let's find the comrades of the 606 Institute tomorrow to solve this problem together!" ”

The 606 Institute is engaged in the engine, and how to dissipate heat to the rear fuselage, how to arrange these pipelines, etc., must be inseparable from the cooperation of the 606 Institute.

Mr. Gu patted his thigh excitedly, and the others also looked at Qin Feng, and when they found this young man for the first time, he was also open-minded.

"Let's go, let's go to dinner." At this time, it was getting dark, and dinner at the test flight institute began.

Test pilots must maintain physical fitness, so test pilots are served in a special restaurant.

Qin Feng and Wang Yang walked into the test pilot's restaurant together, and at the same time, they also met other test pilots, these people were all Qin Feng had heard of before, and now when he saw these seniors, he sincerely admired them.

And everyone heard that Qin Feng was about to fly the tail spin, and they admired him even more, saying that Qin Feng was really the first to fly the tail spin, and he had already successfully changed it from the tail spin.

While eating, everyone started to communicate.

"Our J-8 is said to be finalized this year, but today it seems that there are still a lot of problems with our aircraft." Qin Feng said.

Some of the people present were flying J-8, and when they heard Qin Feng say this, they all felt that it was very difficult, and until now, there are still many subjects that have not been tested for flight.

"Qin Feng, if you also come to fly our J-8, it will definitely be a lot faster, you have a lot of ink in your stomach, and the suggestions you put forward today are very important to Mr. Gu." Wang Yang said.

Qin Feng shook his head again and again: "I can't do it, everyone is the real hero." ”

At that time, the motherland was poor and white, but, relying on the aid of the Soviet Union, in the first five-year plan, it was built into an industrial country, such achievements impressed the world, but there were also hidden risks.

After the founding of the People's Republic of China, on the basis of a blank space, it was able to produce its own J-5 and J-6 fighters at once.

In this way, although the Soviet-aided projects raised the technical level of domestic aviation production, the country did not make much progress in terms of the conditions for aviation scientific research and the most important basic theoretical research, and after the withdrawal of Soviet experts, the work of aviation scientific research regressed to a great extent.

Now, the consequences of this situation are vividly reflected in the J-8.

The J-8 is only a double-issued version of the J-7, and the problems are endless, for example, when it was just built, the problems found after only 2 glides required the factory and the institute to solve 85 defects.

Now, seeing that it is about to be finalized, the problems continue to arise one after another.

"Speaking of heroes, it's not just us, even Mr. Gu has also been to the sky." Wang Yang said.

Qin Feng listened with interest, he had read Jaeger's autobiography, and knew that there were many stories about test pilots, and there were also many stories about domestic test pilots.

Mr. Gu has also been to heaven, what is going on?

Seeing that Qin Feng was so interested, Wang Yang said while eating.

"At the beginning, not long after we started the test flight work, there was a serious tremor phenomenon when the flight M number reached 0.86, and the test flight work could not be continued."

The vibration of the new aircraft is common in test flights, and if it is in the West, there is naturally a complete set of processing processes, but there is no domestic one.

"This problem has plagued us for 9 years, until last year, Mr. Gu decided to give it a go, let's put the surface of the J-8 fighter with fluff, so that the velvet line swings with the air flow, which can show the basic flow field. At that time, Mr. Gu took the J-6 trainer aircraft at an altitude of 7,000 meters, less than 30 meters away from the J-8, and observed the velvet line attached to the plane at close range. ”

When the technical level is not enough, it can only be dangerous, Qin Feng heard this, and immediately paid full attention, it was really thrilling at that time.

"As a result, Mr. Gu really saw that the vibration problem of our fuselage was caused by the separation of airflow formed by the sudden change of the cross-section of the rear fuselage, and the vibration was eliminated by modifying the shape after finding out the key to the problem."

Qin Feng listened to it very much, Mr. Gu is also a character, the key is that he can still listen to other people's opinions, and he listened to his own suggestions on the air intake at the nose and on both sides.

When it comes to the test flight, everyone is talking.

"I have a question, though." Qin Feng said: "Why does our plane still have air intake in the nose?" ”

As soon as Qin Feng asked, all of a sudden, the people around him were silent, everyone knew it, indeed, the most criticized thing about this plane is that it is still the nose intake!

Needless to say, Western third-generation aircraft, such as F-15, F-16, even if they are authentic second-generation aircraft, such as the West's main F-4, such as the Soviet Union's main MiG-23, have long been thrown away from the nose air intake.

Now that I have been doing it for more than ten years, I still have a nose intake thing.

Everyone didn't speak, Qin Feng continued: "The second-generation aircraft in the West are transitioning to the air intake on both sides, after all, the nose can be vacated to install large radar equipment, and the gap between us is still very large." ”

"And now it is overgoing to the third-generation aircraft, and the pursuit is the performance of large angles of attack, so the belly air intake will gradually become the main force, and there will definitely be more and more designs similar to F-16 fighters in the future. So far, we are still stuck in the nose air intake, lagging behind. ”

The advantages and disadvantages of various air intakes, Qin Feng is clear.

When the air intake on both sides, when turning, the air intake on one side will be blocked, causing the airflow distortion of the air intake, while the abdominal air intake does not have this risk, and the performance at high angles of attack is also high.

However, the belly air intake puts higher demands on the airport, and it is easy to suck the debris on the runway into the engine, causing terrible mechanical failure.

As for the nose air intake, hehehe.