The Science Fiction World of Xueba

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"set sail?!"

Pang Xuelin got up from the bed at once, picked up the phone according to the memory instilled in him by the system, and dialed Shen Yuan's number.

"Quick answer the phone, quick answer the phone!"

Pang Xuelin muttered anxiously in his heart.

Although he knew that the chance of saving the crew of Sunset No. 6 by this phone call was very slim—not to mention that he didn't know where Sunset No. 6 was sailing now, but how to persuade Shen Yuan to give up the mission of Sunset No. grasp.

In his impression, his teacher was persistent and stubborn by nature, and once he made a decision, no one could make him change his decision.

But Pang Xuelin always wanted to try.

Not only for the girl who will be trapped in the center of the earth, but also for his own mission.

If Sunset Six can return early, I don't know if there is a way to make that tragedy happen.

beep - beep - beep -

The beeps on the phone seemed extraordinarily long.

After a dozen rings, the phone was picked up.

"What's up?"

On the other end of the phone, Shen Yuan's slightly tired and majestic voice sounded.

"Teacher, I'm Pang Xuelin. Has Sunset 6 set sail now? Where is it?"

"Sunset 6 has been sailing for more than ten hours, and it is now about 2,500 kilometers underground..."

Pang Xuelin was startled, and said: "Teacher, let the Sunset 6 return quickly, if you don't return, it will be too late!"

"What's wrong? Why did you let Sunset 6 return?"

Pang Xuelin pondered for a moment, and quickly organized his words: "Teacher, Sunset 6 is very dangerous. I checked the route plan of Sunset 6 this time, and found that there is probably a crack leading to the earth's core in the mantle of this route. The high-pressure liquid iron-nickel in the core filled this crack, so that on the route of Sunset 6, the Gutenberg discontinuity at the junction of the mantle and the core extended upward for nearly 1,000 kilometers.

Sunset 6 does not have the ability to navigate in the earth's core with high-pressure liquid iron and nickel at its core. Once it enters this crack, the spacecraft will likely sink into the earth's core, and there is no way to get out! "

Shen Yuan's voice suddenly became serious: "Are you sure?"

"Very sure!"

Pang Xuelin said firmly.

As soon as the voice fell, there was a piercing siren on the other end of the phone, and there were faint exclamations from others.

Shen Yuan said: "Something happened on my side, let's not talk about it."

The phone was hung up abruptly.

Pang Xuelin frowned, he had a vague premonition.

Sure enough, half an hour later, the bad premonition became a reality.

Shen Yuan called, and he on the other end of the phone seemed a little anxious: "Xuelin, the danger you said has become a reality. Sunset 6 has indeed fallen into a gap filled with high-pressure liquid iron and nickel. I need you to come Take a trip to Turpan, discuss the rescue plan for Sunset 6, and tell us how you identified the crack extending from the core to the mantle. I have dispatched a plane and it is expected to arrive in Beijing within an hour. You wait patiently in the dormitory, and someone will pick you up when the time comes."

"good."

Pang Xuelin said in a deep voice.

After hanging up the phone, Pang Xuelin shook his head helplessly.

He knew that the system was not that good, giving him a chance to prevent the accident before the spacecraft crashed.

But no matter what, since Sunset 6 has already entered the center of the earth, how to rescue it is the most important thing.

At the end of the novel "Earth Cannon", because human beings have no way to pinpoint the location of Sunset 6, decades later, they are still unable to rescue Sunset 6 from the depths of the earth's core.

"Just because they can't do it, doesn't mean I can't do it!"

Pang Xuelin clenched his fists, with an inexplicable gleam in his eyes.

Half an hour later, there was a knock on the door, and two soldiers appeared in front of Pang Xuelin.

"Are you Dr. Pang Xuelin?"

"It's me, who are you?"

"Oh, Academician Shen sent us to pick you up. He needs you to go to the Turpan base immediately."

"Hold on!"

Pang Xuelin took the luggage he had prepared and went out with the two soldiers.

This era is very different from the Beijing city he remembers.

Although the core area maintains the style and features of the historical ancient city, in the new urban area, hundreds of kilometers of high-rise buildings are lined up one after another, straight into the sky. What surprised Pang Xuelin the most is that there are overpasses and overpasses between the high-rise buildings. They are connected with each other to form a unique 3D three-dimensional city style.

Along the way, from time to time, he could still see some pedestrians wearing solo flying suits walking through it, filled with the style of the future city.

In less than 20 minutes, the flying car that Pang Xuelin and the two soldiers took arrived at a military airport.

What appeared in front of Pang Xuelin was a manned aircraft in the shape of a waverider, nearly 30 meters long, more than ten meters wide, and six meters high.

"A waverider manned aircraft!"

Pang Xuelin muttered to himself.

The so-called waverider has to start with the shock wave.

A shock wave is a strong disturbance wave.

At the shock wave, the air will experience a sudden increase in pressure, temperature and density from the shock wave front to the shock wave, and the air velocity will decrease at the same time.

Generally speaking, shock waves are very common in situations such as supersonic aircraft, explosions, and bullet shooting, and can be directly observed with a schlieren instrument.

Because of the sudden change of the gas density before and after the shock wave, very obvious dark fringes will be produced on the schlieren instrument at the shock wave.

Of course, although the shock wave is discontinuous from a macroscopic point of view, the shock wave itself still has a certain thickness, generally in the order of several molecular mean free paths.

Generally speaking, people will divide the shock wave into normal shock wave and oblique shock wave according to its shape.

The normal shock wave assumes that there is an infinite cylinder in which the air is at rest.

A piston is housed in the cylinder. When the piston accelerates to the right from rest, the gas on the right side of the piston will generate disturbance waves in turn and propagate to the right.

When the piston continues to accelerate, because the wave speed of the subsequent wave is greater than that of the previous wave, the latter wave must catch up with the previous wave. A normal shock wave is formed when countless perturbation waves are superimposed to form a compression wave in a vertical plane.

Oblique shock wave When a cone moves at supersonic speed, because its speed exceeds the speed of sound, the disturbance emitted from the object will superimpose to form a wave front, that is, oblique shock wave.

The Mach wave formed by a supersonic moving object is an ideal situation of an oblique shock wave.

When the moving speed of the object is faster, the included angle of the shock wave formed is also smaller.

When the speed of the object does not exceed the speed of sound, the disturbance emitted by the object cannot be superimposed on a wave front, and a shock wave cannot be formed.

Generally speaking, normal oblique shock waves are all attached shock waves. And when the airflow turning angle δ is too large, a detached shock wave will be generated.

Most of the front end of the detached shock wave exists in the form of a normal shock wave, which will bring greater shock wave resistance to the object.

Under normal circumstances, hypersonic vehicles use attached shock waves to reduce shock wave resistance; while spacecraft return capsules use blunt heads to generate detachment shock waves, and use the resistance of detachment shock waves to convert kinetic energy faster into heat energy to achieve deceleration after re-entry into the atmosphere.

The heat energy is absorbed and carried away by the ablative layer covering the bottom.

The concept of a waverider is the idea of ​​using shock wave pressure to increase the lift-to-drag ratio of a hypersonic vehicle in the aerodynamic shape design.

Therefore, the lower surface of the waverider will be designed in the form of a flat bottom to leave space for the airflow after the high-pressure shock wave; the upper surface will be designed in various streamlined shapes according to different requirements.

In this way, the aircraft can use the pressure from below as its own lift, increasing the lift-to-drag ratio. Because it obtains lift by "riding" on the shock wave generated by its own flight, it is named "waverider".

In the real world, this kind of aircraft is only used in ballistic missile warheads and other fields, and it is also a high-end product.

But in this era, waveriders have clearly been used on a large scale.

No wonder Shen Yuan said that he would send a plane from Turpan to the capital within an hour.

Pang Xuelin thought to himself.

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