The three-stage centrifugal compressor is good, but the base area with very weak basic industrial level does not have the processing and manufacturing conditions at all.
Yu Hua initially determined the design of the air intake unit of the compressor consisting of a two-stage centrifugal compressor and a turbine, and then set the compressor working power, size and other values based on the air intake volume of the air intake unit.
The working power of the compressor is determined by the motor, and the motor power needs to meet the standard of handling 1014 cubic meters of air intake per hour.
Yu Hua looked calm, his mind was running at high speed and he quickly calculated the specific motor power parameters, and then determined the type and size of the motor based on these power parameters.
Technology research and development is like this. One parameter determines another parameter, and it must be done step by step. If there is a problem in any step, it will lead to failure.
Soon, Yu Hua determined the rated power and maximum power of the motor of the compressor and other relevant parameters, and turned his attention to the most important compression structure of the compressor.
The compression structure directly affects the air compression performance of the compressor.
"Traditional piston compressors cannot handle an air intake volume of 1,014 cubic meters per hour. It is okay for cars and propeller aircraft, but it is a drop in the bucket for air separation equipment. I can't build an oversized cylinder and piston.
, then the difficulty of materials and processing technology will skyrocket again... It's a bit troublesome. At first, I only had a simple understanding of the information on air separation equipment, but I didn't expect this thing to be so complicated." Yu Hua turned the pencil in his right hand, with a look of thought in his eyes.
Color, my mind is constantly searching for memories, vertically searching for technical information about air separation equipment in the brain memory information like a database.
When I first learned about oxygen top-blown converter technology at Station B, the videos I watched mainly focused on metallurgical engineering and machinery, and only briefly touched on air separation equipment.
A little headache.
Yu Hua can't find a compression structure that can efficiently handle huge amounts of air.
The piston compression structure used in large-scale tank engines and aircraft engines simply cannot handle so much air.
This is not tens or hundreds of cubic meters of air per hour.
How to do it?
Yu Hua thought about it several times, but could not find any relevant reference materials. He frowned slightly, as he was somewhat unexpected about this situation.
Yu Hua had long expected the difficulty of technological research and development for industrial-grade air separation equipment. However, he did not expect that it would be so difficult. The difficulty of research and development far exceeded his psychological expectations.
Now, the progress is stuck here in the compressed structure.
The key is that the compression structure is extremely important, and Yu Hua cannot circumvent it, let alone solve it through trickery.
If the problem of the compression structure is not solved, the air separation equipment cannot be built. Without the air separation equipment, the so-called oxygen top-blown converter is a joke.
"Don't rush, take your time, no reference material means nothing." Regarding this situation, Yu Hua did not panic. He breathed steadily, looked calm, thought about it in his mind, and fortunately packed up all the drawings, packaged them and put them away, and then
Get up and go downstairs, heading to the machine shop.
There is no reference, but he can request tactical support.
As the highest university in China, Tsinghua University is home to world-class mechanical engineering experts and aerospace power experts. Yes, this person is still Professor Zhuang.
Yu Hua doesn't have a bad habit of pretending to understand and insisting on it. He has to ask when it's time to ask.
He quickly came to the mechanical hall, and after checking his identity, Yu Hua walked into the hall. As soon as he arrived outside the door of the mechanical engineering laboratory, sharp and harsh sounds came from inside. Professor Zhuang, who is the chairman of the Department of Mechanical Engineering at Tsinghua University,
, instead of staying in the office drinking tea, I spent time in the laboratory doing knowledge.
Knowledge specific to the mechanical field.
What makes the sound is the gantry mill. There is a square steel plate on the workbench, about 5 mm thick and 30 cm × 25 cm in area, slightly larger than a textbook. Professor Zhuang controls the gantry mill to perform surface processing on the four corners.
There is a hole, and there are several pieces of processed square steel plates next to it.
Yu Hua stood quietly, not disturbing Professor Zhuang who was at work.
After a while, the working sound of the gantry milling weakened and the milling head rose, leaving behind a steel plate with smooth surface and holes in the four corners.
"How are the results of the final exam?" Professor Zhuang wore protective gloves and removed the square steel plate with a slightly higher temperature. After careful inspection, he confirmed that it was correct. He looked at Yu Hua aside and asked with a smile.
"Students who are recommended to the school do not need to take the final exam of this semester." After hearing this, Yu Hua bowed and saluted as a student. His words were respectful and natural, and he replied with a smile.
Zhuang Qianding was startled for a moment, and then he recalled Yu Hua's status as a recommended student. He laughed and shook his head: "I even forgot that you were a recommended student. Look at my brain."
"Professor, what do you process?" Yu Hua looked at the square steel plate in Zhuang Qianding's hand with a hint of curiosity, somewhat confused as to its purpose.
"When I was bored, I remembered the bulletproof vests I had seen in the US Army before, so I designed a bulletproof vest myself. I called it a bulletproof vest."
Zhuang Qianding placed the processed steel plates on the ground and sighed: "There happened to be some scraps left in the laboratory, so I was going to make a few sets. The performance of these steels imported from the United States is very good. The thickness of 5 mm can withstand damage at a distance of 200 meters.
Shooting with 6.5mm Arisaka bullets, as well as shells and grenade fragments, can greatly improve the survival rate of soldiers on the battlefield. This is the design drawing. Take a look at it and make some suggestions by the way."
"Bulletproof vest?" Yu Hua was a little surprised when he heard this very modern professional term and Professor Zhuang's words echoed in his ears.
I haven’t seen you in a few days. Professor Zhuang, you have crossed over from the vertical deep hole drilling machine to the field of bulletproof vests. It’s really...
Yu Hua can only say that he is awesome.
Regarding the body armor itself, Yu Hua was not very surprised. The concept of body armor came from ancient armor. It was first produced during World War I and was made of ordinary steel. However, due to the strength of the material, the bulletproof performance was not high.
Around the 1920s, the United States developed a scale-like steel bulletproof vest. The bulletproof performance was greatly improved compared to early bulletproof vests, but it still could not protect against direct rifle bullets. It could only protect against pistol bullets, grenade fragments and artillery shells.
Broken pieces.
Of course, body armor is not popular and is only used by a very small number of troops. It can be called a military luxury product.
As a master of mechanical engineering from Cornell University and a master of chemical engineering from MIT, Professor Zhuang learned that body armor is not surprising at all.
Yu Hua took the slightly oil-stained design drawing with his right hand and looked at it carefully. The bulletproof vest on the drawing is composed of a jacket and a protective layer. It is similar to modern bulletproof vests. It mainly protects the torso rather than the limbs and head. The protective power is composed of two layers.
Made of steel plates.
Simple and crude.
After a while, Zhuang Qianding smiled and asked, "How was it?"
"Professor, there is nothing wrong with the concept. I think the bulletproof layer can be slightly improved." Yu Hua pondered for a while and said.
"You said." Zhuang Qianding nodded.
"I suggest that the bulletproof layer can refer to the composite armor used by the British on warships, adding a layer of ceramic plates and a layer of cement wire plates. The thickness of both should be controlled within 5 mm. The outermost layer is a cement wire plate, and the middle layer
It is a ceramic plate, and the innermost layer is a 5mm steel plate. In this case, according to calculations, the protection should be improved to 50 meters to 100 meters when shot by 6.5mm Arisaka bullets, and 350 meters to 550 meters when shot by 7.92mm heavy pointed bullets." Yu Hua said.
Give your own suggestions.
The bulletproof vest developed by Professor Zhuang has reached perfection in concept and there is no need for improvement. The bulletproof layer can be read in the next article.
Yu Hua did not propose any unrealistic protective materials such as Kevlar, nylon, fiberglass and ultra-high molecular weight polyethylene fiber.
As for liquid body armor made of non-Newtonian materials, don’t even think about it.
The simple and crude cement wire mesh and ceramic sheets are very practical.
The materials are widely used and the cost is cheap, but the disadvantage is just one word - heavy.
But this flaw seems extremely insignificant when faced with death.
To be fair, Professor Zhuang woke Yu Hua up. He had previously been obsessed with weapons and only thought about firearms, completely forgetting the existence of defensive military equipment.
Does a bulletproof vest composed of cement wire plate, ceramic plate and 5mm steel plate require any technical content?
Sorry, the technical content of this thing is almost zero.
Zhuang Qianding was slightly surprised when he received Yu Hua's answer. He fell into deep thought and asked: "I didn't expect you to do research on weapons. Is the protection increased so high because of the attenuation and interference of kinetic energy caused by bullets penetrating materials of different densities?
?”
Zhuang Qianding did not doubt Yu Hua's bragging, because he was very aware of Yu Hua's computing power. What surprised him was that just adding two layers of bulletproof layers could increase the protection from 200 meters/6.5 Arisaka bullets to 50 meters-100
m/6.5mm Arisaka bullet.
Moreover, it can defend against shots from 7.92mm heavy-pointed bullets at about 350 meters.
7.92mm heavy-pointed bullets are the bullets used by domestic army machine guns. In other words, the protective power has reached the level of protecting machine gun bullets.
Although it is only 350 meters away, the protection is not much better than before.
"Yes, the current bullet design is based on the balance of the Danone effect, penetration force and stopping force. After the bullet shoots materials of different densities, the kinetic energy attenuates and is interfered by the reaction force from the material. In addition, the stopping force and Danone effect
The penetration force of the bullet will drop rapidly in a short period of time. This is a mathematical model that students studied not long ago." Yu Hua nodded, picked up the paper and pen Zhuang Qianding placed next to him, and wrote out the theoretical model and mathematical
Calculation process, and final data.
After Yu Hua wrote down the theoretical model and calculation process, Zhuang Qianding picked up the draft paper that had undergone rigorous mathematical calculations and reviewed it carefully.
Yu Hua stood aside, watching Zhuang Qianding's expression slowly change from serious to solemn, and felt a faint sense of joy in his heart. This kind of speech in the academic field and being valued by top professors was very important to a newly promoted person.
For a scholar, it is really comfortable.
After a few minutes, Professor Zhuang slowly put down the draft paper and looked at Yu Hua.
"I have to say that this is another research result, a research result that cannot be made public. Why didn't I find that research results were so easy to come out before? Yu Hua, how deep is your research on weapons?"
"Uh... which aspect are you referring to? In terms of academics, students can accurately calculate the lethality and kinetic energy data of various types of bullets, calculate the parabola and landing point of artillery shells, as well as the maximum range, and calculate the performance values of different riflings. In terms of application,
Students can independently design a rifle, a mortar, etc."
"Can you design a 75mm cannon?" Zhuang Qianding heard this and his eyes lit up. He did not expect that Yu Hua's research in the field of weapons had reached this level, reaching the level he had achieved at MIT.
Yes, Zhuang Qianding is not only a mechanical expert, chemical expert, and aviation power expert, but also a very professional weapons expert.
The reason is very simple. If you understand mechanics, you will understand weapons. If you understand chemical engineering, you will understand ammunition. The dynamics are exactly the same.
Although Zhuang Qianding has never participated in the research and development of any military weapons and equipment, his level is definitely top-notch.
"No." Yu Hua wanted to say yes, but after thinking about it, he was still not ready to tell the truth. It is already very difficult for a recommended student who has just entered Tsinghua University to understand these things. If he also knows how to design a 75mm cannon, I'm sorry, but Yu Hua is completely
Can't explain it.
Hey, wait, what did I come to the machine shop for?