Chapter 1191 Predicting Spinal Detonation
After the warhead reentry experiment was confirmed to be successful, Chang Haonan and his team did not stay at Base 51 for too long. Instead, they quickly compiled relevant data and then returned to the capital.
It's not that there are any particularly urgent tasks in the hypersonics project that we need to solve urgently.
It’s about aviation development——
The news he released as early as the beginning of this year about significantly raising the emission standards for the next generation of engines has finally had an echo in Western countries.
After several trials, Rolls-Royce finally openly expressed its hope to contact the Aerospace Power Group to learn more about China's specific requirements in order to prepare in advance.
Of course, this is only a superficial reason.
I'm afraid the real purpose is to get to the bottom of things and decide whether to stand with the other two to safeguard the collective interests of the established aviation suppliers, or to turn around and sell them at a better price.
On the other hand, the development work of the F136 engine has basically reached a dead end, and the very 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 the matter of contacting Luo Luo does not require Chang Haonan to personally take action for the time being, with so many things coming together, it may be difficult for Haofa Group alone to handle it.
As the person directly responsible, he always needs to give some specific instructions in advance.
Therefore, after conducting a test in the capital and taking a few days to rest, Chang Haonan rushed to Haojing without stopping...
Just a few days after landing, it was the end of the month.
As usual, he also received monthly R&D progress reports from participating units.
He was responsible for the warhead himself, so of course there was no problem.
Although the seeker was temporarily used as a semi-finished product in the first test, the missile-borne SAR is not an insurmountable peak for the electronic technology group that has now transformed, and everything is progressing normally.
As for the details of projectile materials and production processes, it is not a problem.
The verification bomb itself is just a gadget with a volume of several tons and a diameter of one meter. Since there are several Tu-160s as cover vehicles, we have not thought about any tricks such as carbon fiber shells. For aerospace systems, It is a familiar road.
Instead, the problem lies with the rocket engine, which was initially thought to be a minor problem.
Of course, it's not a life-threatening problem.
However, Chen Zhiwei said that there are a lot of additional tests that need to be carried out, so the progress may be slightly slower than expected.
Fortunately, Chang Haonan had left some margin, so it would not delay the important matter.
Originally, he was not an expert in rocket engines, so he planned to just read the report from the Sixth Academy.
However, looking at the back, I found that what troubled the opponent was actually the tangentially unstable combustion problem caused by rotational detonation.
Now, Chang Haonan is no longer sleepy——
The detonation engine is a large-scale concept compared to the traditional slow-burn engine.
It is not limited to the type of engine.
Rocket, ramjet and turbine engines can all apply the detonation principle.
Therefore, Chang Haonan really has some research on this aspect...
……
After spending about a week sorting out relevant information, Chang Haonan took advantage of a Friday afternoon to personally go to the Sixth Academy to hold a technical analysis meeting.
Regarding his arrival, Chen Zhiwei was indeed a little surprised when he first received the notice.
But I didn’t think much about it, just regarded it as a normal work inspection——
After all, many times, the so-called "paying attention" to a problem does not mean increasing the resources and manpower to solve the problem, but increasing the number of leaders focusing on the problem and the frequency of meetings.
This situation has improved a lot in recent years, but it is actually difficult to completely avoid it.
On the one hand, this is a blind spot in thinking. Even if the person in charge is also a front-line technician, sometimes it is difficult to realize that there is something wrong.
On the other hand, the total resources of a project are ultimately limited. Leaders also have leadership difficulties.
Therefore, Chen Zhiwei probably sorted out the information that Li Bin had seen before and the research progress these days, and then came to the conference room in advance.
In order not to delay the testing work, I did not bring too many backbones from below.
After meeting Chang Haonan, he introduced the unstable combustion situation encountered during this period as usual, as well as the subsequent analysis conducted by Director Li Bin to him.
The former basically said nothing after the meeting officially started. He just listened to the report attentively and lowered his head to record something in his notebook from time to time.
It wasn't until Chen Zhiwei finished his report that he slowly raised his head, remained silent for a while, and finally said:
"Did you record any data related to the wall temperature of the combustion chamber during those tests where combustion instability occurred?"
This first question immediately stunned Chen Zhiwei.
When he gave the report just now, he had already prepared several drafts of the questions Chang Haonan might ask, and had an answer for each one.
But these questions are mostly of a general or theoretical nature.
After all, Chang Haonan is not an expert in rocket engineering.
As a result, the other party came up with such a specific question.
Moreover, it still seems to have nothing to do with unstable combustion.
Fortunately, Chen Zhiwei acted quickly. Although he didn't understand why, he just nodded after a slight hesitation:
"There must be this, but the front-line 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 under his arm to Chang Haonan.
"Academician Chang, the wall temperature data you want."
The latter nodded and said to Chen Zhiwei and others while opening the folder:
"Combustion instability induced by detonation waves in ordinary engines is an indirect detonation that changes from slow combustion to detonation... You use pressure and flame signal characteristics to determine the approximate location where the detonation wave is formed. In principle, there is no problem. , but it is impossible for the pressure or flame signal measuring points to cover the entire side wall of the combustion chamber, so the accuracy of each round of testing is very low, and many iterations are needed to obtain valuable conclusions.”
"The combustion chamber wall temperature, as an external manifestation of the combustion wave temperature, also has unique corresponding characteristics 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 feasible and operational suggestions, Chen Zhiwei was a little unable to react for a while.
This time he was stunned for a while before he spoke hesitantly:
"However, the relationship between detonation waves and wall temperature is quite complicated. It would be very difficult to infer it backwards. Or..."
Chen Zhiwei hesitated a little:
"Or are you saying, Academician Chang, that you can theoretically calculate the entire process?"
The difficulty of this matter is basically the same as solving the N-S equation.
If true, it would basically mean that all human research related to "energy" has come to an end.
Although Chang Haonan's goal is indeed this, at the moment... it can only be said 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 book in front of him:
"However, a variable geometry engine can be used to study the relationship between detonation waves at different positions and combustion instability... Because the wall temperature parameters can be measured remotely and continuously, although experiments are still needed, the number of times is certain Much less than the original method..."
Chen Zhiwei took the piece of paper and found that it was a design drawing of a device.
His mind was still a little confused at the moment, so it took him a while to understand the specific meaning of the content in the picture.
However, while his mind was completely clear, Chen Zhiwei paid attention to a more important issue——
If this problem can be studied and understood, it seems...
Can the propagation characteristics and flow field structure of detonation waves in rotating detonation engines be accurately predicted?
(End of chapter)