MTL - The Science Fiction World of Xueba-Chapter 505 Wave rider

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"set sail?!"

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

"Quick call, quick call!"

Pang Xuelin murmured anxiously in his heart.

Although he knew that the chance of saving the crew of the No. 6 crew on the phone was minimal-not to mention that he did not know where the No. 6 crew was sailing now. How to persuade Shen Yuan to give up the assignment of the No. 6 crew, Pang Xuelin had no point grasp.

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

But Pang Xuelin always has to try it.

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

If the sunset can be returned early, I don't know if there is a way to make that tragedy happen.

Toot-Toot-Toot-

The beep on the phone appeared particularly long.

After a dozen or so rings, the phone was picked up.

"what's up?"

Over the phone, Shen Yuan's slightly tired and majestic voice rang.

"Teacher, I'm Pang Xuelin. Is the sunset setting sail now? What is the position?"

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

Pang Xuelin was startled, and said, "Teacher, let the sunset no. 6 return, and it will be too late before returning!"

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

Pang Xuelin pondered for a moment and quickly organized the language: "Teacher, Sunset 6 is very dangerous. I checked the route plan of Sunset 6 and found that there is probably a fissure to the core in the mantle of this route. The high-pressure liquid iron-nickel in the core fills this crack, making the Gutenberg discontinuous surface at the junction of the mantle and the core extends nearly 1,000 kilometers upward on the route of the sunset. The sunset 6 does not have high pressure. The ability to navigate in the core with liquid iron and nickel as the core, once entering this crack, the spacecraft is likely to sink into the core, and there is no way to come out!"

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

"Very sure!"

Pang Xuelin cut the railway.

As soon as the voice fell, a harsh alarm sounded on the other end of the phone, and there was a faint cry from others.

Shen Yuan said: "Something happened to me, so I won't talk about it."

The phone was hung up.

Pang Xuelin frowned, and he had a bad hunch.

Sure enough, after half an hour, a bad hunch became a reality.

Shen Yuan called, and on the other end of the phone, he looked a little anxious: "Xuelin, the danger you said has become a reality. Sunset 6 did fall into a gap filled with high-pressure liquid iron-nickel. I need you to come A trip to Turpan to discuss the rescue plan on the 6th of the fall, and to tell us how you judged this fissure extending from the core to the mantle. I have sent a plane and expect to arrive in Beijing within an hour, You wait patiently in the dormitory, and someone will pick you up."

"it is good."

Pang Xuelin said in a deep voice.

Hang up the phone, Pang Xuelin shook his head helplessly.

He knew that the system was not so good, giving him the opportunity to prevent the accident from happening before the spacecraft crashed.

But no matter what, since the sunset 6 has entered the earth's center, how to rescue is the most important.

At the end of the novel "Earth Cannon", humans have no way to accurately locate the location of Sunset Six, and decades later, there is still no way to rescue Sunset Six from the depths of the earth's core.

"They can't do it, it doesn't mean I can't do it!"

Pang Xuelin shook his fist, his eyes shining inexplicably.

Half an hour later, the door knocking sounded, and two soldiers appeared in front of Pang Xuelin.

"Are you Dr. Pang Xuelin?"

"It's me, are you?"

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

"Wait!"

Pang Xuelin took the already prepared luggage and followed the two soldiers out.

This era is very different from the Beijing city in his memory.

Although the core area maintains the style of a historical old city, in the new city area, hundreds of kilometers of tall buildings line up one after another, straight into the sky, and what most surprised Pang Xuelin is that the tall buildings even pass through a bridge and an overpass. Connected to each other, forming a unique 3D three-dimensional city style.

Along the way, he could occasionally see some pedestrians wearing single flight suits walking through it, filled with the style of the future city.

In less than twenty minutes, the flying car boarded by Pang Xuelin and the two soldiers arrived at a military airport.

Appearing in front of Pang Xuelin is a manned vehicle with a wave-shaped body shape, nearly 30 meters long, more than ten meters wide, and up to six meters high.

"Manned aircraft on a wave body!"

Pang Xuelin muttered to himself.

The so-called wave-riding body must start with shock waves.

The shock wave is a strong disturbance wave.

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

Generally speaking, shock waves are very common in supersonic vehicles, explosions, bullet shooting, etc., and can be directly observed using a schlieren.

Due to the sudden change of gas density before and after the shock wave, the shock wave will produce very obvious dark lines on the schlieren.

Of course, although the shock wave is discontinuous from a macro perspective, the shock wave itself still has a certain thickness, generally on the order of the average free path of several molecules.

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

The positive shock wave assumes an infinitely long cylinder in which the air is still.

There is a piston in the cylinder. When the piston starts accelerating from the rest to the right, 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 the previous wave, the subsequent wave must catch up with the previous wave. When countless disturbance waves are superimposed to form a vertical compression wave, a positive shock wave is formed.

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

Mach waves formed by supersonic moving objects are an ideal case of oblique shock waves.

When the object moves faster, the angle of the shock wave formed is smaller.

When the speed of an object does not exceed the speed of sound, the disturbance from the object cannot be superimposed on a wavefront, and a shock wave cannot be formed.

Generally speaking, the normal oblique shock waves are appendage shock waves. When the turning angle δ of the air flow is too large, the off-body shock wave will be generated.

Most of the front end of the off-body shock wave is in the form of positive shock wave, which will bring greater shock wave resistance to the object.

Under normal circumstances, hypersonic vehicles use attached shock waves to reduce shock resistance; while the spacecraft return module will use a blunt head to generate off-body shock waves, and use the resistance of off-body shock waves to convert kinetic energy faster. Into thermal energy to achieve deceleration after reentering the atmosphere.

The heat energy is absorbed and taken away by the ablation layer covering the bottom.

The concept of wave rider~www.novelbuddy.com~ is the idea of ​​using shock wave pressure to improve the lift-to-drag ratio of the aircraft in the aerodynamic shape design of hypersonic aircraft.

Therefore, the lower surface of the wave-riding body will be designed as a flat bottom, leaving space for the airflow after the high-pressure shock wave; the upper is normally designed into various streamlines according to different needs.

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

In the real world, this type of aircraft is only used in ballistic missile warheads and other fields, and it is also a highly sophisticated product.

But in this era, the wave-riding body aircraft has obviously been applied on a large scale.

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

Pang Xuelin secretly said.

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