This Liu Lang is still very good. He has learned to this extent in a short period of time. No, I have to ask him!
Professor Claire asked the question again while thinking about it.
"Okay, this is the specific operation of the piston and cylinder. Now let me ask you some big questions about engines... What are the principles and differences between turbojet engines and turbofan engines?"
"In a turbojet engine, after the air enters the engine from the intake duct, it is first compressed by a high-speed compressor, producing high-pressure dense air to provide a large amount of oxygen. The combustion chamber injects fuel and burns it, impacting the turbine backward, and the turbine drives the front
In the compressor, the gas flow is ejected from the nozzle to generate thrust.
The turbojet has only one air passage, which is technically called a "duct", while the turbofan engine has two air passages. In other words, the turbojet engine is a single-duct engine, while the turbofan is a double-duct engine.
The difference is obvious. The larger the bypass ratio, the more fuel-efficient and better the economy. High-bypass-ratio engines have very good energy efficiency at subsonic speeds, so they are widely used in passenger aircraft, transport aircraft, etc."
"Then let me ask you again, there is a turboprop engine, how does it operate?"
Claire asked again.
Liu Lang complained a little in his heart. There was not much content on this question in the materials. It was just a brief explanation. Fortunately, he also asked other professors for some information.
The essence of a turboprop engine is similar to a turbojet engine connected to a reducer and driving an external propeller. The fuel efficiency of a turboprop engine is usually higher than that of a turbofan engine, but it is not perfect. One of the reasons is that the turboprop engine
There is an extra reducer, that is, a transmission gear. The existence of the transmission gear firstly increases the weight of the engine, and secondly, it will cause some power loss."
"What about the ramjet?"
Claire immediately asked again.
"Professor, the ramjet engine should be the latest engine being studied in the United States, right? But...well, whether it is a turbojet or a turbofan engine, they have a "compressor" at the front. This is a big guy and weighs a lot.
It weighs hundreds of kilograms. It would be great if it could be removed. But the problem is, without the compressor, how to compress the air?
If the aircraft flies faster, the oncoming air will be faster. When it reaches several times the speed of sound, the air will naturally be compressed. The high-pressure air enters the combustion chamber, mixes with fuel, burns violently and is ejected backward at high speed.
Getting power is the principle of a ramjet engine. I don't know how to make it. Professor, do you know?"
The ramjet engine is one of the most advanced engines today. Its design and manufacturing are the core secrets of the country. Professor Claire only mentioned it briefly in previous lectures, but he did not even tell everyone the principle. Liu Lang only
It is a speculation, and he can imagine that this kind of engine will definitely be installed on fighter jets. It not only reduces the weight, but also can obtain power at high speed. I believe that the latest generation of American fighter jets will be equipped with this kind of engine.
Professor Claire asked five more questions in a row, and Liu Lang answered them one by one. Two of the questions did not appear in the materials at all. After thinking for a moment, Liu Lang gave the answer based on his strong logical reasoning ability.
, although it is not perfect, it basically gets to the point.
"Haha, you little guy is a miracle!"
The unsmiling Professor Claire suddenly laughed, then touched his head, with a smile of relief in his eyes. Liu Lang's performance was so perfect. This was definitely not something that could be accomplished by rote memorization of these materials.
Only by fully mastering all the relevant basic knowledge can he answer his questions. Liu Lang was able to do so in a short period of time, which can be regarded as a miracle.
"Jimmy, you are a person who continues to create miracles. Well, I have decided now that you can participate in the development of some of my key projects!"
This was what Liu Lang was waiting for. Core technology was the key. As long as he was exposed to it, it didn't matter even if he didn't understand it. He could at least write down the knowledge and digest it later.
"Professor, thank you for your trust in me. I will definitely live up to your expectations of me and master the knowledge as soon as possible. Maybe I can also help you in the future!"
"No, no, you have unlimited potential, and your future achievements will definitely be higher than mine. I don't want to be like Humphrey David!"
Claire waved her hands repeatedly.
Humphrey Davy was Faraday's teacher. He suppressed the genius everywhere because he was jealous of Faraday's talent. But genius is a genius after all, and no one can suppress it. The final result was that after his death, Faraday became the man who changed human history.
As for him, his original achievements were dimmed because of his jealousy.
"Professor, you're so grateful. I'm just a student who likes mechanics. I can't compare with those big figures who changed history!"
What Liu Lang has to do is to keep a low profile, and the fewer people know about it, the better. If the intelligence agencies of the US government find out about this, they may come to investigate him.
"Bullshit, can't mechanics change history? Did the Wright brothers change? Did Mr. Ford change? And Watt, he was a shipbuilder. He invented the steam engine, which directly pushed the world into the era of the Industrial Revolution. This
Which of these people is not a big shot in changing history? You have the potential to change history now. If you end up becoming an ordinary professor, it will be your own fault. Don't see me then. I will not waste my talents with someone.
People speak!”
Claire was very angry at Liu Lang's words.
"Okay, Professor, you are right, I will work hard according to your request!"
Does Liu Lang want to make an engine? Of course he does. He would dream that the country's industrial system could independently manufacture an engine that was completely his own and put it in the self-developed Automobile Speed.
But Liu Lang also understood that the engine, which is the pinnacle of the machinery industry, cannot be built just by thinking about it.
When Liu Lang was at Huaxia University, someone proposed to build a car engine by imitating German machine tools, such as Santana's engine. At that time, Professor Xiong scolded those students.
Others don't know, but Professor Xiong knows very well that in order to celebrate the tenth anniversary of the founding of the People's Republic of China, the FAW Factory copied the American Chrysler engine to manufacture the Hongqi car.
The result? After spending several years and a lot of manpower and material resources, it is still a mess. The final product can only be placed in a museum. You can successfully imitate third-rate Western machine tools, but first-rate car engines are simply impossible, at least now.
There is no possibility for China.
It wasn't like the students didn't understand. Liu Lang also wanted to know more about it at that time, so he simply asked Mu Xiaohu to get a Santana from a certain department and then dismantled it.
After Professor Xiong's detailed explanation, everyone finally realized that this was an impossible task.