Open an aircraft carrier to fight against Japan

After hearing Lin Yuan's words, Yun Lan stopped crying, and asked suspiciously: "Really?"

Lin Yuan smiled and said, "Of course, why would I lie to you?"

Tang Fan and Yun Lan were both very happy, and Lin Yuan said, "Eat slowly, I'll be leaving first, by the way, Reporter Tang, when you part, remember where she lives."

This time, neither of them tried to keep Lin Yuan back. Lin Yuan left the restaurant. On the way, he saw many Japanese people parading in the street. The banners read: "Reject negotiations! Beat the Chinese people to submission!" "Down with the negotiators Corrupt officials!"

Lin Yuan walked around them and quickly returned to the residence.As soon as he came back, he said that Tang Fan was fine, to reassure everyone, and Shen Wanqing said, "I've recorded it for you, when will you listen to it?"

Lin Yuan smiled and said, "Of course it is now." After speaking, he took the earphone in her hand and started to listen.

An old voice sounded, Lin Yuan guessed that this person should be a professor, he said: "Master Commander, this is the photo of the mysterious ship you gave us." Upon hearing this, Lin Yuan thought to himself: "It seems that this mysterious ship It should refer to our aircraft carrier."

The voice said again: "In this photo, there is the Yoshino ship of our United Fleet in the distance. According to the distance between the Yoshino ship and the mysterious ship that you told us, we can calculate that the length of the mysterious ship is about 340 meters. The width is about 40 meters, the freeboard height is about 12 meters, and the estimated displacement should be about [-] tons. Other ship shape coefficients, such as the water plane coefficient, cannot be deduced from this picture."

Lin Yuan thought: "With the shape data of the known object and the distance from the known object to the unknown object, it is very easy to calculate the shape data of the unknown object, but the scene below the waterline cannot be captured in the photo. Who knows how their displacement is calculated."

Ito Yuheng added: "The speed of this mysterious ship is very fast. According to my observer's estimation, it reached at least 30 knots when it avoided our artillery fire."

Another old man's voice sounded: "30 knots, how is this possible! Calculated according to the mass of 6.4 tons and the speed of 10 knots, its kinetic energy will be 4 times 6 joules to the ninth power. Everyone knows that ships In the process of traveling, there is a lot of resistance, such as wave-making resistance and the frictional resistance of water in the boundary layer. These resistances are proportional to the high power of the ship's speed, and the wave-making resistance is proportional to the 2th to 10th power of the speed. If it is directly proportional, then we can estimate that the whole ship needs 30 times [-] joules to maintain this speed. One ton of standard coal can release [-] megajoules of heat, and the ship will burn one second in one second. [-] tons of standard coal, if the incomplete combustion of coal is considered, the actual coal consumption will be far greater than this figure, which is absolutely impossible.”

Ito Yuheng said, "Is it impossible for them to burn something else?"

"Impossible, the only thing with a higher calorific value than coal is oil, but how can oil be used as fuel for ships?"

In Lin Yuan's time, it was common sense for warships to use oil as fuel, while ships in the 19th century still used coal as fuel.

Then there was a silence, and a voice said: "Commander, I don't mean to offend, is there something wrong with this photo, this battleship is too long, we all know that the gravity and density of each part of the ship It can't be all the same, so if the various parts are not connected, they will be in different positions in the vertical direction. In fact, it is impossible for a battleship to have such a state, so the support of the keel of the battleship will bear a lot of force, and this A warship weighs so much, do you know what material its keel is made of?"

Ito Yuheng asked, "What do you mean?"

"This kind of load-bearing component can only be made of steel, and its yield strength will be above 400 MPa. According to the current progress of material science in various countries, no country's smelting level can do it."

Another voice said: "I don't know where this ship was built. With a displacement of [-] tons, if you want to build such a ship, you must build a dock that can build such a large ship. This kind of large project, in any It’s impossible to keep a secret anywhere.”

After a long silence, Ito Yuheng sighed and said: "Let's put aside the problem of the ship first, and then talk about those things that can fly. Let's call them flying machines. According to the opinions of experts , How did these things fly?"

A voice said: "This kind of thing really appeared! According to our information, the French have been secretly developing this flying machine. An engineer named Clement Adel drove it in 1890. A plane flew 50 meters above the ground. Since the French side kept the matter secret, very few people knew about it. This plane was powered by a steam engine and the propeller was used as a propeller, but the plane in this picture , can't see the propeller!"

The J-24 uses a turbofan engine with a small bypass ratio, and of course it does not need a propeller.

A voice said: "Since there is no propeller, it may use an unknown propulsion method, such as what our project team is studying, using air for propulsion. We all know the momentum theorem. If this aircraft ejects high-speed airflow backwards, Then the plane will have forward velocity, plus the wings provide lift, so the plane can fly."

Ito Yuheng asked: "How is your research going?"

The voice said: "If you want the air to circulate and do work, you must pressurize it, heat it after pressurization, and then let the air expand. This process seems simple, but it is full of difficulties. We all know that a fan can Fan the air, so we want to use a series of fan-like blades to rotate, which can pressurize the air, but these blades are too difficult to make. The first is the shape. To determine its shape, it needs to be based on the hydrodynamic properties Perform calculations so that the blades can drive the air and do work on the air. If you want to calculate the hydrodynamic properties, you must use the Navier-Stokes equation, which is the ns equation, but this equation is a nonlinear partial differential equation. There is no way to obtain an exact solution, so we can only settle for a numerical solution, but the workload is too great to be calculated until the end of the world. Secondly, even if the shape is calculated, it cannot be processed Come out, through our simplified calculations, this kind of blade must be twisted, this kind of blade cannot be processed by machine tools, and it is even more difficult to pass the casting method!"

Ito Yuheng sighed and said: "Well, let's stop here today, let's continue the discussion tomorrow." The meeting ended with a sigh.

Lin Yuan put down his earphones, and couldn't help feeling worried. He thought: "Our aircraft carrier has far surpassed this era. Once the aircraft carrier needs to be returned to the factory for maintenance, where should we go? Wait until the contract is signed. We must develop our own industry, and when the development is complete, the whole of Japan will become a province of China!"

At this time, Lin Yuan heard his stomach growl a few times, and then he remembered that he hadn't eaten yet. At this moment, Shen Wanqing smiled and said, "Hehe, our genius captain is also hungry?"

It was only at this time that Lin Yuan noticed that Shen Wanqing had been by his side all the time. He smiled and said, "You've been waiting?"

Shen Wanqing smiled and said: "How can I not watch from the sidelines, what if you break my equipment?" After finishing speaking, she walked out with a smile, and quickly brought in a large plate and put it on the table He went up and said, "It's all your fault. You insisted on listening to me just now, and I didn't even finish my meal."

Lin Yuan looked at her coquettish appearance, felt itchy in his heart, and couldn't help jokingly said: "Why don't we eat together, I happen to be hungry too."

Lin Yuan didn't care whether she agreed or not, he just sat at the table, and when he saw Shen Wanqing taking two sets of bowls and chopsticks, he seemed to feel something in his heart. The tempting puffer fish is revealed.

Shen Wanqing filled the rice, soaked the fish soup into the rice, and started eating. Lin Yuan asked, "What is this?"

She smiled and said, "This is fugu. Have you ever eaten it? I like it the most. My mother often makes it for me."

Lin Yuan jokingly asked, "Do you still have a mother?"

Shen Wanqing laughed so much that she spit out the rice in her mouth and said, "Why can't I have a mother?"

Lin Yuan smiled and said: "Should all your agents be orphans? Only when you do this mission can you have no worries! Die for the country at any time!"

Shen Wanqing smiled disdainfully, and said, "You must have read too many online novels! How can there be such an agent, anyway, I have never seen it before."

Lin Yuan said: "Look at us now, going back to the past to fight devils, this is something that only happens in online novels. I wonder if any writer would think of this story?"

The two chatted and laughed for a while, then Lin Yuan became serious and said, "I fancy a girl."

When Shen Wanqing heard it, she felt jealous for no reason, and said angrily, "What did you say?"