The military-industrial scientific research system of the academic master.

Chapter 1191 Predicting Rotating Detonation

After the warhead re-entry experiment was confirmed to be successful, Chang Haonan and his team did not stay at Base 51 for too long. Instead, they quickly sorted out the relevant data and then returned to Beijing.

It’s not that there are any particularly urgent tasks in the hypersonic project that need to be resolved.

It's about the aeroengine.

The news he released at the beginning of this year about significantly raising the emission standards for the next generation of engines has finally received a response from Western countries.

After several attempts, Rolls-Royce finally expressed its hope to contact the Aviation Power Group to learn more about China's specific requirements in order to make preparations in advance.

Of course, this is definitely just a superficial reason.

The real purpose is probably to find out the bottom line and then decide whether to stand with the other two companies to safeguard the collective interests of the old aero-engine suppliers, or to turn around and sell them at a good price.

On the other hand, the development of the F136 engine has basically reached a dead end, and the boldly designed blade pre-deformed lift fan has basically been sentenced to death.

Collaboration on this project is bound to change as well.

In addition, the Trent 900, which is about to enter mass production, needs to re-sign a supply agreement...

In short, although Chang Haonan does not need to personally deal with Luo Luo for the time being, with so many things coming at the same time, it would be difficult for the Gaofa Group alone to handle them.

As the direct person in charge, he always needs to give some specific instructions in advance.

Therefore, after conducting a test in Beijing and resting for a few days, Chang Haonan rushed to Gaojing without stopping...

Just a few days after landing, it was already the end of the month.

As usual, he also received monthly R&D progress reports from each participating unit.

He was responsible for the warhead himself, so of course there was no problem.

Although a semi-finished product was used as the seeker in the first test, missile-borne SAR is not an insurmountable peak for the now transformed Electronic Technology Group, and everything is progressing normally.

As for details such as the projectile material and production process, they are even less of a problem.

The verification missile itself is just a small thing with a volume of several tons and a diameter of one meter. Because there are several Tu-160s as backup vehicles, there is no need to consider any fancy tricks such as carbon fiber shells. It is a familiar thing for the aerospace system.

The problem actually lies with the rocket engine, which was initially thought to be a minor issue.

Of course, it’s not a life-threatening problem.

However, Chen Zhiwei said that there are many additional tests that need to be carried out, so the progress may be slightly slower than expected.

Fortunately, Chang Haonan had left some room for error, so it didn't delay anything important.

Originally, he was not an expert in rocket engines and planned to just read the report from the Sixth Academy and leave it at that.

However, after watching the later part, I found that what was troubling the other party was the tangential unstable combustion problem caused by rotating detonation.

This time, Chang Haonan is no longer sleepy——

Detonation engine is a broad concept relative to traditional slow-burning engine.

It is not limited to the type of engine.

Rockets, ramjet and turbine engines can all apply the detonation principle.

Therefore, Chang Haonan has done some research in this area...

……

After spending about a week organizing the relevant information, Chang Haonan took advantage of a Friday afternoon to personally go to the Sixth Institute to hold a technical analysis meeting.

Chen Zhiwei was indeed a little surprised when he first received the notice of his arrival.

But I didn't think much about it, just regarded it as a normal work inspection.

After all, many times, the so-called "attachment" to a problem does not mean increasing the resources and manpower to solve the problem, but increasing the number of leaders who focus on the problem and the frequency of meetings.

This situation has improved a lot in recent years, but it is actually difficult to avoid completely.

On the one hand, this is a blind spot in thinking. Even if the person in charge is a front-line technician, it is sometimes difficult to realize that something is wrong.

On the other hand, the total amount of resources for a project is ultimately limited. Leadership also has its own difficulties.

Therefore, Chen Zhiwei sorted out the information that Li Bin had seen before, as well as the research progress in recent days, and came to the meeting room in advance.

In order not to delay the testing work, not too many key personnel were brought along.

After meeting Chang Haonan, he introduced the unstable combustion situation encountered during this period as usual, as well as the analysis given to him by Director Li Bin later.

The former basically stopped talking after the meeting officially started. He just listened to the report attentively and occasionally lowered his head to write something in a notebook.

Only after Chen Zhiwei had finished his report did he slowly raise his head, remain silent for a while, and finally speak:

"Did you record the relevant data of the combustion chamber wall temperature during the tests where you experienced combustion instability?"

This first question stunned Chen Zhiwei.

When he was making the report just now, he had already prepared several possible questions that Chang Haonan might ask, and had thought of answers for each of them.

But these questions are mostly general or theoretical in nature.

After all, Chang Haonan is not an expert in rocket engineering.

As a result, the other party asked such a specific question right from the start.

Moreover, it seems to have nothing to do with unstable combustion.

Fortunately, Chen Zhiwei acted quickly. Although he didn't understand why, he nodded after a slight hesitation:

"Of course there is, but the person in charge is following up on the experiment in the test workshop. Please wait a moment..."

After saying that, he quickly turned around and went out to make a phone call.

Soon, a young engineer still wearing a lab coat trotted into the conference room, wiped the sweat from his forehead with the back of his hand, and then handed a report tucked under his arm to Chang Haonan.

"Academician Chang, the wall temperature data you requested."

The latter nodded, opened the folder and said to Chen Zhiwei and others:

"In ordinary engines, combustion instabilities induced by detonation waves are all indirect detonations from slow combustion to detonation... You use pressure and flame signal characteristics to determine the approximate location of detonation wave formation. In principle, there is no problem, but it is impossible for pressure or flame signal measurement points to cover the entire combustion chamber side wall. Therefore, the accuracy of each round of testing is very low, and it takes many iterations to obtain valuable conclusions."

"The combustion chamber wall temperature, as an external manifestation of the combustion wave temperature, also has a unique corresponding characteristic with the location where the detonation wave is formed. In other words, the detonation wave formed at a specific location will produce a specific wall temperature distribution..."

Faced with such a feasible and practical suggestion, Chen Zhiwei was a little unresponsive for a while.

This time he was stunned for a long time before speaking hesitantly:

"But the relationship between the blast wave and the wall temperature is quite complicated. It would be very difficult to reverse the relationship. Or should I say..."

Chen Zhiwei hesitated a little:

"Or can you theoretically calculate the entire process, Academician Chang?"

The difficulty of this task is basically the same as solving the NS equations.

If this is true, it basically means that all human research related to "energy" has come to an end.

Although Chang Haonan’s goal is indeed this, but at the moment... we can only say that he is still working hard.

So he smiled and waved his hand:

"This is not possible yet..."

As he spoke, he took out a piece of paper from the notebook in front of him:

"However, we can use a variable geometry engine to study the relationship between detonation waves and combustion instability at different locations... Because the wall temperature parameters can be measured remotely and continuously, although experiments are still required, the number of experiments will definitely be much less than the original method..."

Chen Zhiwei took the paper and found that it was a design drawing of a device.

His mind was still a little fuzzy at the moment, so it took him some time to understand the specific meaning of the picture.

However, when his mind was fully cleared, Chen Zhiwei paid attention to a more important issue:

If this problem can be studied clearly, it seems...

Is it also possible to accurately predict the propagation characteristics and flow field structure of the detonation wave in a rotating detonation engine?