The conversation between the two people is in Chinese, so the word "wave rider" is very strange to Ilya, and there is a big difference between Chinese and other languages, that is, every word that makes up Chinese vocabulary has meaning, unlike other languages, a single syllable is meaningless, so when Chinese describes new things, it does not need to make a single word, just combine the original words.

It is this characteristic that makes Ilya unable to understand the "wave rider", there are many homophones in Chinese, where can Ilya know which three Chinese characters make up this word, Ilya is from a science background, which makes him instinctively sensitive to new techniques, which is also an important reason why the tsar sent him to negotiate with Lin Yuan.

Ilya vaguely knew that he had touched an esoteric secret, and this secret would have the potential to change the fate of Russia in the future, his heart was pounding, but his face was not shown at all, and he asked with a smile: "Lin Shuai, what does this wave rider mean?" ”

Lin Yuan said with a smile: "When the speed of the object is very fast, it produces a kind of wave, we call it shock wave, the nature of this wave is very peculiar, the pressure of the air behind the wave will be greatly increased, so this wave will push our plane forward." ”

Here, Lin Yuan mentioned the concept of waverider, which is also a structure applied to hypersonic aircraft, but the shock wave cannot push the waverider forward, the shock wave only provides the lift required by the aircraft, and the forward power depends on the engine of the aircraft itself.

Lin Yuan is not worried at all that they can develop hypersonic aircraft after knowing the shock wave and waverider body, because the most basic thing in the study of aerodynamics is simulation calculation, you must know that there is no analytical solution to the NS equation, and the flow field can only be calculated by numerical simulation.

Ilya had never heard of such a theory, and he frowned and asked, "What you said is true?" ”

Lin Yuan smiled and said nothing, thinking to himself, "You guys go and study and see what you can come up with." ”

Seeing that Lin Yuan did not speak, Ilya knew that the conversation should end, he put on a mask, and instantly became a typical Chinese, and then said: "Lin Shuai, I will go first, Master Li and I are at Zhangyi Station, and we will talk about the follow-up matters." ”

Lin Yuan smiled and pointed to the door, Ilya walked out of the door satisfied, thinking that he had taken a big advantage, Lin Yuan looked at the back of Ilya leaving, turned on the communicator, and got in touch with the Beijing ship.

During this voyage to the open sea, the Beijing warship undertook many test tasks, including one: the verification study of sea-based hypersonic vehicles, which was mainly a follow-up study, and the target of the tracking was the X43B hypersonic vehicle of the United States, and the scramjet engine newly developed by China was tested.

There are many aspects of the design of the aircraft, one of the important is the design of gas dynamics, when the speed of the gas reaches the high speed of sound, many of its characteristics are very different from the low-speed stage, almost completely different, so the chief scientist of this project is a gas dynamics expert, academician of the Chinese Academy of Sciences, chief scientist of a gas dynamics research institute, Zhou Huaxin.

Because Lin Yuan has never had the intention of building an airplane, so Zhou Huaxin is very idle, Lin Yuan does not want to build an airplane, but to build an airplane first, the engine must be built first, the gas turbine is still too far away, the piston engine is not mature, the only thing that can be used is the steam engine, but the steam engine is too bulky, it is impossible to use it as a power equipment on the aircraft.

Lin Yuan found Zhou Huaxin and said with a smile: "Old Zhou, how is your blood pressure lately?" ”

Zhou Huaxin said with a smile: "It's okay, every morning a pill on blood pressure pills is followed, and it can't go up, why did you remember to greet me, an old man, today?" ”

Lin Yuan smiled: "Isn't this a temporary cram? Greetings and greetings, are you afraid that you will not answer when you ask you for a while? ”

Zhou Huaxin laughed twice and said, "When have I never agreed to what you begged me!" Let's get straight to the point. ”

Lin Yuan asked, "Do you know anything about gas dynamics?" ”

Zhou Huaxin has studied it all his life, so Lin Yuan asked knowingly, and wanted to elicit his following words, but Zhou Huaxin said: "The more I read, the more I dare not say that I understand, after studying it for a lifetime, it is just touching the skin, there are many young people who don't understand ......"

Lin Yuan knows that Zhou Lao likes philosophy, and often links scientific research with philosophy, he always likes to tell people that those who engage in scientific research need to understand some philosophy, but now is obviously not the time to listen to lectures, Lin Yuan hurriedly said: "No, no, no, I don't mean that, I want to ask you if you know the history of gas dynamics?" ”

Zhou Huaxin said: "A little bit of it, many people who are engaged in science don't like to study history, I think this is wrong......

Lin Yuan thought to himself: "Fortunately, Zhou Lao's speed of speech is relatively slow, and the interval between the two sentences is relatively long, so it will not be rude to interrupt him." Lin Yuan then interrupted him again and said, "Old Zhou, can you guide their research on the fork in the road according to the level of gas dynamics in 1895, focusing on hypersonic vehicles." ”

Zhou Huaxin asked, "What did you say?" ”

Lin Yuan explained: "I want to use this method to delay the development of technology in other countries, I know that this job is very difficult, and the top scientists of this era are not easy to deceive, if they make up a mistake, they can see it at a glance, I don't have such ability, so I have to come to you." ”

Zhou Huaxin said with a smile: "Don't worry, it's on me." ”

Lin Yuan said again: "Old Zhou, I have promised the Russians to give them the wave-riding body aircraft, look at it, how can we make a fuss about this?" ”

Zhou Huaxin thought for a while and said: "The materials of the high-speed aircraft are all high-temperature resistant materials, let's not expose this thing, let's send them a model." ”

Two days later, the Beijing ship sent the information carefully prepared by Zhou Huaxin to Lin Yuan, Lin Yuan briefly looked at it, this information is about supersonic gas dynamics, it is full of traps, such as supersonic air flow will produce shock waves when decelerating, and expansion waves when accelerating, and in this information, Zhou Huaxin deliberately ignored this fact and only described the nature of shock waves.

Zhou Huaxin did not make any major changes to the waverider model, because it was really unnecessary, and the technical difficulty of the hypersonic vehicle was far from the aerodynamic shape, and the greater difficulty was in the control technology and propulsion technology.

After a while, Ilya came and said, "I promise that while you are fighting the Japanese, we in Russia will not promise an alliance with the Japanese and maintain a military presence at the junction of Jilin and Shengjing, so as to deter the Japanese. ”

Lin Yuan handed over a heavy box of technical materials to Ilya, took out the model, and said: "The prototype is too big, we can't transport it over, give you the model first, and when you withdraw your troops, we will give you the prototype." ”

Ilya took the box, smiled lightly, stretched out her hand and said, "I hope we can become friends in the future." ”

Lin Yuan pointed to the box and asked, "Won't you open it and take a look?" ”

Ilya shook her head helplessly and said, "I want to see it too, but I can't." ”