Chapter 792

"Dr. Herbert, we did it!"

Dawn one took off successfully and roared into the blue sky at an incredible speed.

All the staff looked up excitedly and cheerfully.

Herbert was not in a hurry to be happy and stared at the soaring dawn one.

Taking off does not mean success.

The most important is the state response of the aircraft when the speed reaches the limit.

Carmen drove dawn one and accelerated. Soon, the sound barrier came as scheduled.

When the flight speed reaches nine tenths of the speed of sound, that is, when the air speed is about 950 kilometers per hour, the speed of local air flow may reach the speed of sound, resulting in local shock waves, resulting in a sharp increase in aerodynamic resistance.

To further increase the speed, the engine needs to have more thrust. More seriously, the shock wave can make the air flow through the wing and fuselage surface very disordered, which makes the aircraft shake violently and it is very difficult to operate.

At the same time, the wing will sink and the nose will fall. If the aircraft is climbing at this time, the fuselage will suddenly tilt up automatically. These symptoms can lead to plane crash, the so-called "sound barrier" problem.

Because the transmission speed of sound wave is limited, the moving sound source can catch up with the sound wave emitted by itself. When the speed of an object increases to the same speed as the sound speed, sound waves begin to accumulate in front of the object. If the object has enough acceleration, it can break through the unstable sound wave barrier and rush in front of the sound, that is, break through the sound barrier.

An object moving at supersonic speed will continue to produce a stable pressure wave in front of it. When the object moves towards the observer, the observer will not hear the sound; After the object passes through, the generated waves will spread towards the ground, and the pressure difference between the waves will form an audible effect, that is, sonic boom

When the flight speed of the aircraft is lower than the speed of sound, the air in contact with the aircraft is like a "messenger", which "notifies" the air in front of the aircraft to "make way" at the speed of transmitting sound.

However, when the speed of the aircraft exceeds the speed of sound, the air in front of the aircraft is tightly compressed and piled into a thin wave surface - shock wave. Behind the shock wave, the air is compressed, which suddenly increases the pressure, prevents the further acceleration of the aircraft, and may cause the wing and tail to vibrate violently and explode.

The sound barrier is not only sound waves, but also the resistance from the air. When the flying object is close to Mach 1, that is, the speed of sound, the air rushing in front can not diffuse through the fuselage as usual, so the gas accumulates around the flying body, generating great pressure, and will also trigger an invisible air vortex, commonly known as "death vortex", If the fuselage is not specially reinforced, it will be instantly shaken to pieces!

Now, there is a "death vortex" around the fuselage of dawn 1. Its speed has reached the critical point of breaking through the sound speed!

And dawn one is destined to be a supersonic fighter!

Herbert stared and held his breath.

Success or failure is now!

"Boom!"

After the loud noise, the whole world quieted down.

Breaking Dawn one successfully broke through the sound speed, that is, through the sound barrier!

At this time, the pressure around the fighter will drop sharply. The instantaneous low temperature caused by the steep pressure will make the high-pressure air lower than its dew point, making the water vapor condense into tiny droplets, which looks like a cloud to the naked eye.

Since the low pressure zone will return to normal pressure with the increase of the distance between the air and the fuselage, the overall shape looks like a conical cloud with the object as the central axis and evenly diffused around.

The whole process seems thrilling, but in fact it is only a short time of more than ten seconds.

Soon, dawn one disappeared into the sky without any trace.

Herbert was relieved and smiled.

Breaking Dawn one can fly at Mach 1.3.

Mach number is the ratio of velocity to sound speed. Sound speed has different values at different heights, temperatures and atmospheric densities, which is only a relative value. Mach number 1, that is, one time the speed of sound, is equal to 340ms, that is, 1224 kmh. Those with Mach number less than 1 are subsonic, and those greater than 1 are supersonic.

The B2 bomber had a speed of Mach 0.95 and failed to break through the speed of sound.

Sound speed and supersonic speed may seem to be only a small difference, but they are actually an epoch-making improvement!

This is Chen Liang's first time in a fighter, and he is also a supersonic fighter,

When dawn one broke through the speed of sound just now, and the environment changed from extreme motion to extreme stillness, the feeling was unspeakable.

If you really want to describe it, it is like "crossing". They seem to break through the constraints of the rules of heaven and earth and enter another space from one space.

Einstein once said that when the speed exceeds the speed of light, it can surpass time and even reverse space-time.

Chen Liang can feel this feeling slightly now.

The speed of high-speed rail is generally 200-250 kilometers per hour, and his current speed is almost seven times that of high-speed rail!

"Mr. Chen, there may be no better fighter than dawn in the next 100 years."

Even knowing the values of this fighter in advance, Carmen deeply felt its charm when he personally controlled it.

You know, this is not a fighter that is good at speed, but a bomber!

Carmen's implication is undoubtedly that dawn can lead the world for a hundred years. It may be exaggerated, but it is enough to prove the shock brought by dawn to him.

"How long will it take to enter American airspace?"

Chen Liang asked.

"In fact, we are already in American airspace."

Kamayne responded that the slightly trembling sound line showed a strange emotion,

The United States is recognized as the world's first military power. Who in the world can enter its territory without permission?

But now he did it.

And the Americans are not even aware of it.

Chen Liang thought that the Bahamas was close to the United States. Although they had not yet entered the United States, they might have unknowingly entered the territorial waters of the United States because of the terrorist speed of dawn.

In the past, only the United States, relying on its strong military strength, sent fleets or planes to other people's homes from time to time. Arrogant Americans should never have thought that they would be quietly broken into their homes one day.

"Mr. Chen, in front is the southeast gate of the United States, Florida."

Carmen warned.

Although there was an impulse in his heart, it was no small matter.

You know, armed transit without permission, even if it is just an aircraft, a soldier or a warship, is also equivalent to aggression!

"Fly in."

Chen Liang's response came as if nothing had happened.