Chapter 1284 The little magic of the shock wave wind tunnel
Chang Haonan was not prepared to fully take over the development of solid rocket boosters, so at the meeting he only asked Lin Chenggang to select the important ones among the relevant information and send them over.
The other party also acted very quickly. That afternoon, he sent three confidential personnel to deliver a batch of screened documents and information to the Torch Laboratory.
Although it was screened, a large password box was filled with various storage devices and some necessary paper documents.
After completing the handover, he immediately got into the computer room and began to verify his conjecture at the meeting yesterday.
It wasn't until dinner time the next day that Chang Haonan returned to the office, and then called his founding disciple, Li Yabo.
Benefiting from the experience and knowledge accumulated during his doctoral studies, the latter quickly turned to theoretical research after graduation.
Because of his strong ability and very few confidential research fields, he is able to publish many high-level articles every year, many of which are in top journals such as Science or Nature. This was a matter of course as early as two years ago. The geological assessment was given the title of associate professor.
In addition, because Yao Mengna is currently raising a baby at home, and the other teachers in the laboratory are responsible for projects outside, he has gradually begun to take charge of the daily scientific research work of the laboratory.
"Teacher, you are looking for me."
Li Yabo walked in lightly.
"Yes, you should sit down first."
Chang Haonan nodded, gently knocked the pile of paper he had just printed out on the table, and placed it 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 has some plans for the next step of work.
However, in order to avoid Li Yabo from making preconceived judgments, and of course to let the other party understand the basic situation, no more specific instructions were issued immediately.
However, after Li Yabo lowered his head and glanced at the title of the paper, he was stunned for a moment, then quickly flipped through it, then raised his head and looked at Chang Haonan:
"Teacher, these papers I've seen it before..."
This time it was Chang Haonan's turn to be surprised:
"Have you seen them all? "
Li Yabo nodded:
"Actually, I was even responsible for reviewing the latest article..."
"..."
Chang Haonan suddenly had an idea It feels like "when children grow up, they also learn to pretend to be invisible".
"Okay... then I'll tell you straight."
He turned his attention 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, all aluminum-based solid propulsion systems The energy release characteristics and oxidation reaction mechanism of the agent.”
Hearing this request, Li Yabo’s eyes flashed with surprise.
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.
But to produce different results for the same research object.
"You mean...there are problems 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, reviewers and editors will not be responsible for verifying the data in the paper, so if something goes wrong, it is most likely due to this aspect.
Chang Haonan took a deep breath and organized the language a little in his mind:
“I’m not sure if there is a problem with the data, but they are advancing the three-component AP/HTPB/Al The mechanism study and judgment of the thermal decomposition process of the agent, that is, the main premise of the entire analysis process and decomposition kinetics calculation is not consistent with my molecular simulation results..."
"Ah?"
Li Yabo's eyes almost darkened when he heard this judgment.
This is equivalent to directly mistaking the first formula when doing physics problems. Then no matter how accurate the subsequent process is, it will only go further and further away.
“But are the kinetic parameters they finally calculated consistent with the Kissinger equation and the Ozawa equation?” “It’s hard to say...”
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Chang Haonan shook his head:
“It may be that the experiment was done after reaching the conclusion, so some fine-tuning was done to the data, or it may be that a blind cat encountered a dead mouse... You should know, For this kind of research topic, even if you just set up a theoretical model and do forced fitting, as long as it doesn't It’s extremely outrageous, and it can be compared to the previous person.”
“This…”
Li Yabo’s face was full of tension:
“ But the paper published by MIT... wouldn’t make such a low-level mistake?”
Due to the requirements for the publication cycle of papers and the basic trust among peers, in addition to the authenticity of the data, reviewers will basically not consider situations like what Chang Haonan said.
To a certain extent, it is part of the fool-killing master.
“This is not a low-level mistake...”
Chang Haonan curled his lips:
“This part of the content has little to do with the macroscopic combustion characteristics. The microscopic mechanism is related...even if there are colleagues who do it Verification, as long as it is not actually filled into the engine, there will be no obvious errors in the results. Even if someone in chemistry finds a problem, they can explain that the focus of this article is on engineering theory rather than pure Theory..."
6◇9◇书◇Bar
Hearing this, Li Yabo could only lament that he was still too young after all:
"Then what do you mean..."
" Further decompose the thermal decomposition process into three processes and recalculate it.”
Chang Haonan took a piece of paper from the side and had already written a few lines on it:
"The first stage is a slow weight loss stage at low temperature. During this process, the AP component will undergo a solid-solid phase change from cubic to orthorhombic;"
"The second stage is rapid at medium temperature. In the weight loss stage, on the one hand, HTPB begins to undergo an endothermic melting reaction, which plays a certain antagonistic role in the exothermic decomposition reaction of AP. At the same time, HTPB begins to coat the crystal surface of AP, which affects the local decomposition reaction of AP and affects possible reactions to the latter The center plays a role in weakening the activation;"
"The third stage is the stage of slow weight gain at high temperature, that is, the remaining small amount of HTPB begins to further decompose, and some aluminum particles melt, and gradually begins to proceed from slow to violent The oxidation of..."
"..."
Li Yabo did not just look at the page in front of him, but quickly took a pen and began to add to it. Content...
It wasn't until about half an hour later that Chang Haonan, who was already a little dry, finally stopped describing.
The piece of paper in front of Li Yabo has already turned into a notebook...
"Then I will do it right away..."
He reviewed it again Read the contents in the notebook and then stand up.
But he was immediately stopped by Chang Haonan from behind:
"Wait a minute."
Li Yabo turned around:
"Teacher, is there anything else that needs attention?"
Chang Haonan took out an envelope from the drawer:< br>
“I will open a letter of introduction to you. When you do the combustion characteristics experiment, Remember to go to the Institute of Mechanics of the Academy of Sciences and use a shock tube for ignition. This can make the heating process much shorter than the ignition delay time of solid fuel, and it can also restore the pressure environment when the actual engine is working, which is better than flat flame burners and laser ignition. The level of realism is much higher..."
And because Chang Haonan has never said that this research is related to the hypersonic weapon project, Li Yabo has not yet reacted at this time. He hesitated slightly with the envelope in his hand:
"As for the shock tube... …There is an aerodynamic science and technology laboratory in our school next door, and the director of the laboratory has worked with us many times, and we are familiar with both the business and the process…”< br>
He was only halfway through his words when he was interrupted by Chang Haonan waving his hand:
"The performance of our school is not enough. I need an initial working pressure of 25-30 ATMs. Don't talk about it now." Domestically, even in the world, only Huairou can meet the requirements.”
In fact, this can be regarded as some of the benefits brought about by the development of ultra-high-speed wind tunnels.
Apart from China, there is currently no other country that has such abundant resources that can use high-performance shock wave generating devices for the study of combustion chemical kinetics.
Until this moment, Li Yabo finally realized something, and the expression on his face gradually became solemn:
"I know..."
(End of this chapter)