Siheyuan: The Era of Struggle

Chapter 206 Research Experiments in Shock Wave Wind Tunnel (Subscription Request)

"Mr. Guo, what's the situation here?"

When Yang Ning arrived at the wind tunnel experimental base, he found a group of young students surrounding a pipe that was narrow in front and wide in the back, with a length of about ten meters.

The narrow part of the pipe has a diameter of only ten centimeters, and the wide part has a diameter of forty centimeters. On the inner wall of the pipe, in order to better distinguish the various ends, Mr. Guo and his team divided this wind tunnel model of only ten meters into three parts by different colors.

The red pipe is the high-temperature and high-explosive end, that is, the part filled with combustible gas to produce high temperature and high pressure. After ignition, it will form high-temperature, high-pressure, and high-speed gas. The blue pipe is the driven end. The high-temperature, high-pressure, and high-speed gas generated after the high-temperature and high-pressure end is ignited will compress the air in this section of the pipe to form a high-temperature and high-pressure gas source.

Finally, after being accelerated by the cyan high-speed nozzle, a wind simulating the airflow under the high-speed operation of the aircraft can be formed.

The different end positions are separated by diaphragms, through which the airflow breaks during the test.

The wind tunnel in front of us is just a model, so it looks very short and small.

"Yang Ning, you're here?" After seeing Yang Ning, Mr. Guo was surprised at first, and then greeted him.

When others saw Yang Ning, they came forward to greet him, even though Yang Ning was only a few years older than them. Some of them were even older than Yang Ning.

However, after participating in research with Yang Ning for so long, these students have gradually come to know Yang Ning's abilities and no longer dare to underestimate him.

"Since you have spoken, how dare I not come?" Yang Ning first greeted the students, and finally looked at Mr. Guo and asked.

"In order to come to you, I have canceled Mr. Qian's engine test today."

"Haha, it's okay, just let it go if you want to. I will definitely not let you down today." After hearing Yang Ning's words, Mr. Guo waved his hand nonchalantly, then called Academician Yu over and said with a little pride.

"What? You have built a supersonic shock wave wind tunnel?" Yang Ning asked with a smile.

"How can it be so fast?" Mr. Guo glared at Yang Ning's teasing expression, then pointed at Academician Yu who was walking over and said, "Xiao Yu has developed a new shock tube using pig iron as the main material. This experiment today is the first time this shock tube has been used, so I asked you to come over and check it."

"Hello, Mr. Yang, I'm sorry to bother you this time!" Academician Yu stretched out his hand a little awkwardly and said to Yang Ning.

"You're too polite, Dr. Yu. I didn't expect you to have developed the shock tube so quickly. Congratulations!" Looking at Academician Yu who looked a little nervous, Yang Ning smiled and shook hands with him.

Who would have thought that this slightly nervous young man would become the father of our hypersonic wind tunnel in the future.

Yang Ning also admired this person very much. After all, using the principle of explosion to study hypersonic wind tunnels is really risking one's life. If one is not careful, one will end up with no trace left.

But this person before us has used countless experiments to blaze a new path for our aerospace industry.

"Engineer Yang, you are too polite. I have just entered the institute and I am not a doctor yet. What I am studying for now is a postdoctoral degree."

After hearing what Yang Ning said, Academician Yu looked at Mr. Guo nervously and quickly explained.

"It's the same. It's much better than me who graduated from college..."

As soon as Yang Ning said this, he was interrupted by Mr. Guo. He looked at Yang Ning strangely and said, "How dare you say that? I heard that when they first decided to implement the graduate degree system last year, Professor Hua personally invited you to study for a Ph.D. at their Institute of Mathematics, but you didn't go."

“Hehe…” Yang Ning smiled awkwardly after hearing what Mr. Guo said: “At that time, we had a lot of things to do in the data processing department, so we didn’t have time to do mathematical research. So we could only disappoint Mr. Hua’s kindness.”

Yang Ning knew that with the associate doctorate system we implemented, in the end only one person successfully obtained the associate doctorate degree, so he did not plan to spend more time on this aspect.

If he had that much time, wouldn't it be great to process a few documents?

Although Professor Hua promised that if he was willing, he could get his postdoctoral degree within one year, Yang Ning still refused.

Moreover, in a few years, we will cancel the associate doctorate degree awarded in China, so there is no need for him to waste his energy.

"Mr. Guo, the experiment is ready. Shall we start the ignition test now?"

At this time, a researcher ran over and said to Mr. Guo.

Mr. Guo did not immediately give the order to ignite the fire, but looked at Academician Yu and asked seriously: "Can you guarantee the safety of the personnel?"

"No problem!" The awkwardness that Academician Yu had felt when he saw Yang Ning had disappeared, and he answered confidently.

"Well, except for the necessary experimenters, everyone else should evacuate this laboratory immediately."

After Mr. Guo gave the order, he immediately reminded Academician Yu: "Xiao Yu, safety comes first. Go."

"Yes!" Academician Yu said loudly, and then ran over to discuss the experimental precautions with the people participating in the experiment.

"Okay, let's vacate this laboratory too. If any problems occur here, I won't be able to report to my superiors." After Academician Yu left, Mr. Guo said to Yang Ning.

"Okay!" Yang Ning also followed suit. After all, if an accident happened, his life might really be lost here.

After leaving the laboratory with the others, Yang Ning stood at a safe distance and asked Mr. Guo, who was staring nervously at the direction of the laboratory, "Are there any more detailed data on this experimental wind tunnel?"

"Yes, what do you think?"

Mr. Guo asked someone to bring Yang Ning a copy of the specific data of the wind tunnel and asked curiously.

"Well, after seeing this experimental wind tunnel just now, I do have some ideas. As for whether it will work, I still need to do some calculations to find out."

The specific performance of a wind tunnel is not only related to the pressure generated at the high temperature and high pressure end, but also to the interference of the pipe length and the tunnel wall.

Yang Ning was not clear about the other things, but as for the length of the country's first hypersonic wind tunnel and the diameter of the shock wave duct, Yang Ning had seen them on the Internet in his previous life, so he knew them clearly.

Therefore, Yang Ning now plans to work out the optimal diameter of the shock tube and the length of the wind tunnel, which can also reduce the time for wind tunnel research.

Considering the cost and practicality, Yang Ning did not use the data of JF4 shock wave wind tunnel, but combined the data of JP8 wind tunnel which was successfully developed several years ago, and wanted to design a large wind tunnel of our own. As we all know, although JP8 wind tunnel was put into use in 69, it was actually successfully researched in 64. However, due to some special factors, it was not put into use until five years later.

Just as Yang Ning was comparing the data from the experimental wind tunnel with the later JP8 data for calculations, suddenly all the people who had stayed in the laboratory to conduct experiments rushed out of the laboratory.

Before Yang Ning could figure out the situation, a loud "bang" was heard from the laboratory.

Yang Ning looked up and saw Academician Yu and several young researchers bending over and leaning on their knees, staring at the laboratory and breathing heavily.

When they saw that the laboratory was safe and sound, they all breathed a sigh of relief and shouted to Mr. Guo and his team.

"There's no danger anymore, hurry up and go in and collect data."

After shouting, Academician Yu and several others who had just run out of the laboratory rushed in again in a hurry.

When the others saw that the experiment was over, they ran in as well.

Seeing this situation, Yang Ning glanced at Mr. Guo and asked, "Should we go in?"

Mr. Guo looked at the students rushing into the laboratory and said with a smile, "Let's wait. We can't help much now. But you have to process the experimental data for me immediately."

"No problem." When Yang Ning heard that he didn't need to go in, he picked up the blueprint and continued to calculate.

"Teacher, this is the data of this experiment."

After a while, Academician Yu came towards Mr. Guo and Yang Ning with a stack of data.

When they arrived, Academician Yu handed the information in his hand to Mr. Guo.

Mr. Guo picked it up and looked at it for a while, then looked at Yang Ning who was still writing and drawing and said, "Now, it's time for you to work."

Yang Ning stopped writing, took the data handed over by Mr. Guo and started to look at it.

Mr. Guo did not disturb him, but picked up the drawing that Yang Ning had placed aside and started looking at it.

At first, Mr. Guo was just curious and wanted to see what Yang Ning could calculate through this experiment.

But as he looked at it, Mr. Guo's expression became serious. He originally wanted to pull Yang Ning aside to discuss it, but seeing that Yang Ning was still busy processing the experimental data, he pulled Academician Yu aside, and the two of them discussed Yang Ning's drawing.

"This~" After seeing the wind tunnel data calculated by Yang Ning, Academician Yu's first reaction was whether the data was calculated incorrectly.

"The diameter of the jet nozzle reaches two meters, and the length of the entire wind tunnel pipeline exceeds 100 meters. For such a large wind tunnel, the initial air pressure requirements for the high temperature and high pressure end are very high!"

"And this one doesn't suppress the shock wave generated by the explosion, but uses the detonation generated by the explosion to increase the air pressure. This is simply a bit whimsical. There is no such theory abroad!"

Just when Mr. Guo was wondering if Yang Ning had made a mistake in his calculations, Academician Yu, after his initial shock, looked at the data Yang Ning had calculated and began to think about it. The more he thought about it, the brighter his eyes became.

You should know that in the original history, it was Academician Yu who first came up with the idea of explosion, but at first he thought it was a bit whimsical, so it was not until the 80s, after decades of research, that Academician Yu discovered that this theory was correct.

But now that Yang Ning has put forward this theoretical concept, Academician Yu followed Yang Ning's train of thought and felt that this concept was very feasible. So he said to Mr. Guo: "Teacher, I think this theoretical concept is very feasible."

After hearing what his student said, Mr. Guo looked up at him in surprise, wondering if he had heard it wrong, so he asked again: "What did you say?"

"I think Mr. Yang's theoretical conception is very feasible and not just a figment of his imagination."

When Academician Yu first saw Mr. Guo’s expression, he was a little hesitant, but when he thought about the current difficulties of our aerospace industry, he plucked up the courage to say it again loudly.

During this period, in order to study the aerodynamic shape of supersonic aircraft, the United States, and even aviation powers such as John Bull and Gallic Rooster relied on large-scale sub-transonic wind tunnels to blow air into the models to obtain drag curve data. If the data was not good, the model would be modified until the output curve was closer to the expected value.

The larger the wind tunnel, the more valuable the data will be in engineering and the more likely it will play a role in detailed design.

The transonic wind tunnels of these countries have now reached the 2-meter level. If we cannot build our own 2-meter wind tunnels, we will not be able to catch up with these countries in the field of aerospace.

Looking at the determined eyes of his student, Mr. Guo was stunned for a moment, then he smiled with satisfaction: "If you think it is feasible, then go ahead and do it boldly. We teachers will stand behind you and support you."

"Also, if you encounter any difficulties during the research process, just go to Yang Ning and ask him to help you solve them. Don't be embarrassed. It's you who always causes trouble for us!"

After getting Mr. Guo's approval, Academician Yu said excitedly: "Teacher, don't worry, we will definitely develop our own large wind tunnel."

Although Yang Ning turned on the super brain mode to process the data of this experiment, he could hear the conversation between the teacher and the student clearly.

After hearing Academician Yu finally boldly express his ideas about explosion theory, Yang Ning showed a smile.

If his bombardment theory could be realized earlier, then the wind tunnel we designed based on this theory might not be able to reach the Mach 10 wind speed of the later JP7 due to diameter problems, but the Mach 8 wind speed of JP3 would be enough for us to use until the 21st century.

After all, current aerospace technology is not yet so crazy as to be able to increase the speed of an aircraft to Mach 30, and it does not require a wind tunnel with wind speeds that fast to test it.

Yang Ning felt that as long as Academician Yu was determined to study the explosion theory, with his own assistance, it would not take long for us to develop our large wind tunnel with a diameter of 2 meters.

"How about it? Are you surprised to see my drawing?" Yang Ning said to the teacher and student after processing the experimental data.

"Indeed, your idea is a bit unexpected." Mr. Guo looked at Yang Ning and said with a wry smile.

"But if we want to realize this idea now, there are still many problems that need to be solved in gas explosion and materials science. You can't just leave it alone."

Then Mr. Guo pointed at Academician Yu and said, "You have got my student hooked. He plans to study your theoretical concept and design our large wind tunnel. You can lend a hand then."

(End of this chapter)