Chapter 1284: The Magical Use of the Shock Wave Wind Tunnel

Chapter 1284 The Magical Use of the Shock Wave Wind Tunnel

Chang Haonan was not prepared to take over the development of solid rocket boosters in full, so at the meeting he only asked Lin Chenggang to send over the important information.

The other party was also very efficient. They sent three confidential personnel that afternoon to deliver a batch of screened documents and materials to the Torch Laboratory.

Although it had been screened, the various storage devices plus some necessary paper documents still filled up a fairly large password box.

After completing the handover, he immediately went into the computer room and began to verify his guess at the meeting yesterday.

It was not until almost dinner time the next day that Chang Haonan returned to the office and called his founding disciple, Li Yabo.

Thanks to the experience and knowledge accumulated during his doctoral studies, the latter quickly turned to theoretical research after graduation.

Due to his strong abilities and the fact that his research field is rarely confidential, he is able to publish many high-level articles every year, including in top journals such as Science and Nature. He was naturally awarded the title of associate professor two years ago.

In addition, because Yao Mengna is currently staying at home to take care of her pregnancy, the other teachers in the laboratory are each in charge of their own projects outside, and the daily scientific research work of the laboratory has gradually begun to be presided over by him.

"Teacher, you are looking for me."

Li Yabo walked in quietly.

"Yes, you take a seat first."

Chang Haonan nodded, tapped the stack of papers he had just printed on the table, and placed them in front of the other party:

"Yabo, take a look at these articles. They are related to the oxidation behavior of metal materials."

In fact, he had some plans for his next step.

However, in order to avoid Li Yabo from forming preconceived judgments, and of course to let the other party understand the basic situation, no more specific instructions were given immediately.

However, Li Yabo was stunned after glancing at the title of the paper, then he quickly flipped through the pages, and then looked up at Chang Haonan:

"Teacher, I have read these papers before..."

Now it was Chang Haonan's turn to be surprised:

"Have you seen them all?"

Li Yabo nodded:

"In fact, I was even responsible for reviewing the latest article..."

"..."

Chang Haonan suddenly had a feeling that "the child has grown up and learned to pretend to be cool without being noticed."

"Okay... I'll just say it straight then."

He cast his eyes to the preliminary calculation results on the monitor screen next to him:

"I need you to follow their ideas and re-verify the AP/HTPB/AI system... or to expand on it, the energy release characteristics and oxidation reaction mechanism of all aluminum-based solid propellants."

When he heard this request, a hint of surprise flashed in Li Yabo's eyes.

Based on his understanding of his teacher, this "re-verification" does not mean simply repeating the other party's experimental content according to the content of the paper.

Instead, we should produce some different results for the same research object.

"You mean... there's something wrong with their experiments and characterizations?"

As a reviewer of one of the articles, Li Yabo was very confident that there would be no serious errors in the analysis and derivation process.

However, neither the reviewers nor the editors are responsible for verifying the data in the paper, so if something goes wrong, it is most likely a problem in this area.

Chang Haonan took a deep breath and organized his words in his mind:

"I'm not sure if there are any problems with the data, but their analysis of the mechanism of thermal decomposition of the three-component AP/HTPB/Al propellant, that is, the premise of the entire analysis process and decomposition kinetics calculation, does not match my molecular simulation results..."

"what?"

Li Yabo almost felt dizzy when he heard this judgment.

This is equivalent to applying the first formula incorrectly when solving a physics problem. No matter how accurate the subsequent process is, it will only get further and further off.

"But the kinetic parameters they finally calculated are compatible with the Kissinger equation and the Ozawa equation?"

"That's hard to say..."

Chang Haonan shook his head:

"It's possible that the conclusion was reached before the experiment, so some fine-tuning was done on the data. It's also possible that it was just a blind cat catching a dead mouse... You should know that for this kind of research topic, even if you just randomly apply a theoretical model and force fit it, as long as it's not too outrageous, it can be almost accurate."

"This……"

Li Yabo's face was already filled with an expression of dismay:

"But a paper published by MIT... wouldn't make such a low-level mistake, right?"

Due to the requirements for the publication cycle of papers and the basic trust among peers, reviewers will basically not consider situations like the one mentioned by Chang Haonan, except for the authenticity of the data.

To some extent, it is part of the stupid master.

"This is not some stupid mistake..."

Chang Haonan curled his lips:

"This part has little to do with macroscopic combustion characteristics, but is related to microscopic mechanisms... Even if colleagues do verify it, as long as they don't actually put it into the engine, the results will not be obviously wrong. Even if chemists find problems, they can explain that the focus of this article is on engineering theory rather than pure theory..."

6◇9◇Book◇Bar

Hearing this, Li Yabo could only sigh that he was still too young:

"Then you mean..."

“Further decompose the thermal decomposition process into three processes and recalculate.”

Chang Haonan took a piece of paper from the side, on which several lines had already been written:

"The first stage is a low-temperature, slow weight loss stage, during which the AP component undergoes a solid-solid phase change from cubic to orthorhombic;"

"The second stage is the medium-temperature rapid weight loss stage. On the one hand, HTPB begins to undergo an endothermic melting reaction, which antagonizes the exothermic decomposition reaction of AP to a certain extent. At the same time, HTPB begins to coat the crystal surface of AP, affecting the local decomposition reaction of AP and weakening the activation of the possible reaction centers of the latter. "

"The third stage is the high-temperature slow weight gain stage, which means that the remaining small amount of HTPB begins to decompose further, some aluminum particles melt, and gradually begin to oxidize from slow to intense..."

"..."

Li Yabo did not just stare at the paper in front of him. Instead, he quickly took a pen and began to add content to it...

It was not until about half an hour later that Chang Haonan, who was already feeling a little dry in the mouth, finally stopped describing.

The piece of paper in front of Li Yabo had already turned into a notebook...

"Then I'll do it right away..."

He reviewed the contents of the notebook again and then stood up.

But he was immediately stopped by Chang Haonan from behind:

"Wait a moment."

Li Yabo turned around:

"Teacher, is there anything else I need to pay attention to?"

Chang Haonan took out an envelope from the drawer:

"I'll write you a letter of introduction. When you do the combustion characteristics experiment, remember to go to the Mechanics Institute of the Academy of Sciences and use a shock tube to ignite. This will make the heating process much shorter than the ignition delay time of solid fuels, and it can also restore the pressure environment of the actual engine when it is working. The degree of simulation is much higher than that of flat flame burners and laser ignition..."

Because Chang Haonan had never mentioned that this research was related to the hypersonic weapons project, Li Yabo had not yet reacted, holding the envelope in his hand with a slight hesitation:

"As for shock tubes... our school's Aerodynamic Science and Technology Laboratory next door has one, and the director of that laboratory has worked with us many times, so he's familiar with both the business and the process..."

He was only halfway through his words when Chang Haonan waved his hand and interrupted:

"The performance of our school is not good enough. I need an initial working pressure of 25-30 atm. Currently, not only in China, but also in the world, only Huairou can meet the requirements."

In fact, this can be considered as some of the benefits brought about by the development process of ultra-high-speed wind tunnels.

Apart from China, there is currently no other country that has such abundant resources to use high-performance shock wave generators for the study of combustion chemical dynamics.

Until this moment, Li Yabo finally realized something, and the expression on his face gradually became solemn:

"I see……"