The military-industrial scientific research system of the academic master

Using solid rockets to propel a hypersonic vehicle to a threshold speed, and then starting a scramjet engine to maintain speed or continue accelerating, is the simplest and most intuitive technical strategy in design.

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 very sensitive to the speed and intake parameters during the startup process. In addition, the solid rocket motor cannot stop propulsion midway, so it needs to be very A precise level of energy management rather than a simple miracle of sheer force will solve the problem.

On the other hand, the air-breathing Super is essentially equivalent to a cruise missile. For reasons of tactical flexibility, it needs to be mounted on a general tactical aircraft or installed into a vertical launcher on a warship. Therefore, its power system Not only must sufficient propulsion performance be ensured, but there are also relatively strict volume and weight restrictions.

It is impossible to directly connect the entire ballistic missile as a booster like the verification bomb.

But now there is a problem with the solid rocket motor, which is the top priority, and it is naturally not a trivial matter.

For a moment, 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 weapon project, Lin Chenggang had served as a power system designer for two models, but he had never seen any major battles. He was considered the youngest member in this conference room——

Except Chang Haonan.

Now that he was suddenly being stared at by a group of big guys and seniors, it was inevitable that he would feel a little hairy on his back.

After swallowing secretly, he opened his mouth to explain:

"When the entire Gaochao project just started, Mr. Chang sent our institute a general requirement for rocket booster parameter indicators... To be honest, it is quite harsh, so we plan to add some high-energy oxidants to the composite propellant to Improve propellant performance.”

"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 actually started to introduce the situation, Lin Chenggang got into the mood quickly. In a few sentences, he explained the background of the problem clearly. Then he changed the topic and started to get down to the topic:

"About the middle of last year, we discovered that there was a series of new studies that clarified the combustion characteristics and mechanism of aluminum particles in aluminum-containing solid propellant metal fuels, so we worked hard in this direction... The preliminary research was relatively smooth. , the combustion images of the microscopic area in the combustion chamber were quickly collected through optical photography, and the combustion process and combustion surface chemical reaction characteristics of the AP/HTPB/Al composite propellant system were clarified. "

"But in July this year, we began to try to put several optimized ratios tested previously into the engine for test runs. We found that the performance was indeed improved to a certain extent, but no matter how we adjusted it, the test results were not consistent with the design indicators, and The regularity of the data is very poor... If you use parameter fitting, you can forcefully obtain a relational expression, 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... "

Having said this, he looked up at Chang Haonan with some guilt and sighed in distress:

"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 I estimate it will take about 4-5 years..."

In fact, for a brand new engine model with a leap-forward improvement in performance, 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 with 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's right to be careful... I'd rather check beforehand than rework afterward."

Chang Haonan casually said a slogan that he has remembered from his previous life to this day:

"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 for a moment, then nodded quickly:

"good……"

If Chang Haonan hadn't mentioned the subject of the research group, he would have almost forgotten that the other party was still a professor at Beijing Hang University.

As for why a professor who is engaged in aviation 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 announced an adjournment of 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? Did you get fooled by the paper?"

Chen Zhiwei, who came from the Sixth Academy of Aerospace Science and Technology and had 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◇Book◇Bar

Lin Chenggang was still immersed in his own thoughts at this time. He only reacted after hearing the voice from the side. But as soon as he nodded, before he could say anything, he was overtaken by another representative from the opposite side——

Hong Xiaoyi also came from the Sixth Academy of Aerospace Science and Industry.

In fact, 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 to leave it to their brother units to 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 shouldn't be..."

He took Chen Zhiwei's question and said:

"We have also noticed the research that 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 top journals on materials and energy and power... and you heard him say it is easy. It seems that they are just borrowing from other people’s results, but in fact these papers are relatively basic theoretical research, and 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 back to his senses, suddenly heard such a direct compliment, and was inevitably a little embarrassed, but he still nodded and said that Hong Xiaoyi was right:

"The main reason is that we have done preliminary research and demonstration, and it is basically consistent with the theoretical model they proposed, so at least there will be no problem with the macroscopic combustion characteristics. As for the microscopic mechanism... I can only say this There is already a lot of controversy in this area, and it is generally something only theoretical chemistry will touch upon..."

He breathed a long sigh of relief as he spoke, 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 the topic quickly came to an end.

But Chang Haonan's lightning flashed because of Hong Xiaoyi's words 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 there may be something wrong with their research process..."