Chapter 1283 Research Breadth of the Academician’s Research Group
Using solid rockets to propel a hypersonic flight body to a threshold speed, and then starting a scramjet engine to maintain speed or continue to accelerate, is the simplest and most intuitive design Technology strategy.
However, this requires high performance and stability of the booster itself.
On the one hand, the scramjet engine as the main power needs to start working normally at a speed of about Mach 5.5, and is quite sensitive to the speed and intake parameters during the startup process. In addition, the solid rocket motor cannot Stopping propulsion requires a very precise level of energy management and cannot be solved by a simple miracle of force.
On the other hand, the air-breathing Super is essentially equivalent to a cruise missile. For the sake of tactical flexibility, it needs to be mounted on a general tactical aircraft or installed vertically on a warship. device, so its power system must not only ensure sufficient propulsion performance, but also have relatively strict volume and weight restrictions.
It is impossible to directly connect the entire ballistic missile as a booster like the verification bomb.
Now that the most important solid rocket motor has a problem, it is naturally not a trivial matter.
For a time, the eyes of almost everyone in the conference room were focused on Lin Chenggang.
The main product of the Third Academy of Aerospace Science and Industry is a series of anti-ship missiles equipped by the Chinese Navy, and it also engages in some arms export business.
Although the benefits are pretty good and it is a type of making a lot of money quietly, after entering the 21st century, conventional anti-ship missiles are really not a big deal.
Therefore, before being selected to participate in the hypersonic weapons project, Lin Chenggang, although he had served as a power system designer for two models, had never seen any big battles. He was considered the youngest member in this conference room——
Except Chang Haonan.
Now that I am suddenly being stared at by a group of big guys and seniors, it is inevitable that I will feel a little hairy on my back.
After swallowing secretly, he opened his mouth to explain:
“When the entire Gaochao project just started, Mr. Chang sent our institute a parameter index for the rocket booster. The general requirements... to be honest are quite demanding, so we plan to add some high-energy oxidizers to the composite propellant to improve the performance of the propellant.”
"However, whether it is a long tail pipe engine or a wing pillar charge engine, a certain degree of unstable combustion has occurred after replacing the new propellant. Therefore, in order to ensure the startup success rate of the scramjet engine, it is necessary to delay the gas The time point when the pressure appears to fluctuate, and ensure that the missile breaks through the Mach 5.5 speed wall before this time point, and then directly abandons the boost phase..."
"..."
After he really started to introduce the situation, Lin Chenggang got into the mood very quickly. He explained the background of the problem clearly in a few sentences, and then changed the topic and started Let’s get to the point:
“About the middle of last year, we discovered that there was a series of new studies that clarified the role of aluminum particles in aluminum-containing solid propellant metal fuels. Combustion characteristics and mechanisms in the combustion chamber, so I put some effort in this direction... The preliminary research was relatively smooth, and the combustion images of the microscopic area in the combustion chamber were quickly collected through optical photography, and the AP/HTPB was clearly understood. /Al composite propellant system’s combustion process and combustion surface chemical reaction characteristics”
“But in July this year, we started to try. I tried loading several optimized ratios tested previously into the engine for test running, and found that the performance was indeed improved to a certain extent, but no matter how I adjusted it, the test results were not consistent with the design indicators, and the regularity of the data was very poor... If you use parameter fitting, you can forcefully obtain a relationship, but it is definitely not a reliable design method..."
“At present, it is basically certain that this technical route is feasible, but if we still cannot find a reliable design method, we can only return to the traditional path and find parameters that meet the needs of our project through a large number of experiments. In terms of time, I am afraid... ”
Speaking of this, he looked up at Chang Haonan with some guilt, and sighed in distress:
< br>"To be honest, I have never been exposed to a solid rocket motor that requires such precise indicators before. I can't give a specific progress timetable, but it is estimated to take about 4-5 years..."
In fact, as far as a brand-new engine model with leap-forward performance is concerned, the development cycle of 4-5 years is not long at all.
If it was within the Third Institute before, then this efficiency might even win a group-level technological progress award or the like.
But now that he is seeing other colleagues making rapid progress and giving incredible development cycles, how can he have the nerve to drag down the overall progress of the entire project because of his own personal reasons?
Compared to Lin Chenggang himself, Chang Haonan, who had now returned to the main seat at the conference table, looked normal.
Of course he also feels that 4-5 years is a bit long, but this is obviously not a problem with Lin Chenggang's work attitude. As the person in charge of the overall situation, he must not put additional pressure on the other party at this time. .
"It is right to be careful... I would rather check beforehand than rework afterwards."
Chang Haonan casually said a slogan that he has remembered from his previous life to this day:
< br>
"In addition, several people in my research group are paying attention to the metal morphology and oxidation reaction. Please select the important relevant information and send it to me later..."
Lin Chenggang was stunned. Then he nodded quickly:
"Okay..." If Chang Haonan hadn't mentioned the subject of the research group, he almost forgot that the other party was still a professor at Beijing Hang University.
As for why an aviation professor would study metal materials and chemical reactions...
Well, it’s not surprising that the research scope of a research team with two academicians is ridiculously wide.
Subsequently, considering the mental problems of all the old comrades, Chang Haonan adjourned the meeting.
But his worries were obviously a bit unnecessary.
Because just after he finished speaking, there was a discussion in the conference room.
Although other people are not specifically responsible for the research and development of solid rocket motors in the project, after all, they all come from similar systems and are experienced senior technicians, so they may not understand it at all.
There are even solid rocket power research departments in the neighboring institutes, but because they specialize in different directions, they are not assigned to relevant tasks.
"Researcher Lin, where did you conduct the series of studies you just mentioned? Didn't you get fooled by the paper?"
From the Sixth Academy of Aerospace Science and Technology, already Chen Zhiwei, who played an important role in the verification bomb project, came next to Lin Chenggang.
Although they are all engaged in rocket power, the differences between different propellants can be said to be as different as mountains, so they usually don’t pay much attention to the situation of solid propellants.
6◇9◇书◇Bar
Lin Chenggang was still immersed in his own thoughts at this time. He only reacted after hearing the voice from the side. But before he nodded, he was overtaken by another representative from the opposite side——
< br>Hong Xiaoyi also came from the Sixth Academy of Aerospace Science and Industry.
Actually, when it comes to solid rocket motors, they are the oldest, strongest, and most experienced unit. However, almost all of their efforts are currently focusing on the power research and development of several ballistic missiles, so they have no choice but to hand over Let the brother units take the lead.
However, as the deputy chief engineer of the 41st Institute, Hong Xiaoyi himself has absolutely no say in terms of ability.
“This should not be...”
He took Chen Zhiwei’s question and said:
“We have also noticed the research Lao Lin just mentioned. It was done by a research group at MIT. From last year to the first half of this year, it published several articles on materials and energy dynamics. The top journal in the field...and you heard him say it lightly, good It’s like learning from other people’s results, but in fact these papers are relatively basic theoretical research. It must have taken a lot of effort to transform it into an application level in such a short period of time.”
Lin Chenggang, who had come to his senses, suddenly heard a wave of such straightforward compliments. , inevitably a little embarrassed, but still nodded, saying that Hong Xiaoyi was right:
“The main reason is that we have also done preliminary research and demonstrations, and they are basically consistent with the theoretical models they proposed, so At least there will be no problem with the macroscopic combustion characteristics. As for the microscopic mechanism...it can only be said that the current controversy in this aspect is very large, and it is generally something that only theoretical chemistry will touch on..."
He breathed a long sigh of relief as he spoke, He leaned back and buried his upper body into the back of the seat:
"Generally speaking, we tend to think that this is because the solid propellant is affected by certain characteristics that are not yet understood after being loaded into the combustion chamber in the form of a grain column, which causes the combustion characteristics to change significantly compared with those outside. ..."
"..."
The three of them were just chatting during the break. Besides, although we are brothers, we all have our own unique skills and secrets. , so this topic quickly came to an end.
But Chang Haonan was struck by what Hong Xiaoyi said just now -
"Researcher Lin."
He interrupted the conversation between the three people:
“When you distribute information later, remember to give me those original papers as well.”
“I think so. Maybe there is something wrong with their research process..."
(End of this chapter)