Why can a fourth generation fighter fly at supersonic speed without a wasp waist?

To understand this problem, we must first clarify two concepts, namely: transonic area law and bee waist design.

Transonic area law: In 1952, Whitcomb found through wind tunnel experiments that when the Mach number of the flight is close to 1, the zero rising wave resistance of the aircraft is a function of the distribution of the cross-sectional area (the cross-sectional area perpendicular to the direction of flight), and is approximately equal to the zero rising wave resistance of the spiral body with the same cross-sectional area distribution (called the equivalent spin body). Therefore, the cross-sectional area of the aircraft can be adjusted according to the cross-sectional area distribution of the spin with minimum wave resistance, so as to obtain a smaller wave resistance.

For example, reduce the fuselage cross-sectional area of the wing, tail and fuselage connection area and increase the fuselage cross-sectional area in front and rear of the wing and tail to form a bee-waist-shaped fuselage, so that the cross-sectional area distribution of the aircraft equivalent spin body is close to that of the minimum wave resistance spin body or as smooth as possible.

Bee waist design (also known as "cola bottle" design): In order to conform to the area law, the resistance is least when the area distribution of the object conforms to the area distribution law of the spiral body along the longitudinal axis. Originally, the round fuselage was supposed to be a spin body, but the appearance of the wing suddenly increased the area in the middle of the aircraft, breaking this law.

Therefore, the middle part of the fuselage should be appropriately changed to make the overall area conform to the area law as much as possible. That's the bee waist design.

The reason why the current fourth-generation fighter can fly at supersonic speed without the bee waist design is that on the one hand, it is equipped with a high-performance engine; On the other hand, the bee waist design is just a form of pursuing a conform area ratio. In the early days, people's understanding and practice of aerodynamics were not handy, so they generally adopted an obvious bee waist design. Now that technology has advanced, the understanding of supersonic wave resistance has become clearer, and it does not necessarily have to be trapped in the way of conforming to the area ratio.

At the same time, the theory of area ratio has also advanced and can be manifested in many forms.

It was the 60s of the area ratio, and now technology has long since developed into the 21st century, and aerodynamics is no longer the original level of the 50s.

Hehe, the current fighters are all supersonic flight, but the fourth-generation aircraft have supersonic cruise capability, and supersonic flight are two different concepts. The Wasp is an improved third-generation aircraft, that is, a third-and-a-half-generation fighter, which also has some supersonic cruise capabilities, but it is not an order of magnitude compared to the fourth-generation aircraft.

Twin-engine high-performance engine.

1. The ultimate speed of the piston engine is about 1,000 kilometers, and Lao Mei used to do experiments and found that the efficiency of the propeller reached the limit of about 1,000 kilometers, and it was impossible to break through further, and there was a danger of disintegration, so the jet aircraft was developed.

2. There are aircraft that can achieve supersonic flight without afterburner, such as the F22 of the United States, which can maintain supersonic cruise at double sonic speed without afterburner.

3. Afterburner is actually equivalent to opening an external plug-in, with an additional afterburner to participate in the work, and the power is greatly increased in a short time, but the afterburner flight is too fuel-intensive.

For example, the F4 ghost, if you fly with afterburner, you can only last 10 minutes without fuel

Supersonic cruise is when an aircraft continues to fly at supersonic speeds without turning on the afterburner. The first aircraft capable of maintaining supersonic level flight was the British Space Lightning Fighter.

In the early days, as long as it could maintain supersonic flight in level flight, it was considered to have supersonic cruise capability. However, due to the fact that the afterburner must be turned on to maintain supersonic speed, the fuel consumption is extremely huge, up to dozens of times that of the normal state, which is very uneconomical. The average fighter jet runs out of fuel in less than ten minutes with the afterburner fully on.

Due to the improvement of modern engine technology, it has become possible to carry out supersonic cruise without turning on the afterburner, and in the Advanced Tactical Fighter (ATF) program proposed by the United States Air Force in 1987, this capability is listed as one of the necessary requirements, so the modern definition of supersonic cruise must be able to do without turning on the afterburner, otherwise it can only be regarded as having supersonic flight capability. At present, the aircraft with supersonic cruise capability include the former Soviet Union's MiG-31 interceptor, Tu-160 strategic bomber, the F-22 and the defeated YF-23 fighter in the US ATF program, the Typhoon fighter jointly developed by the United Kingdom, Germany, Italy, Spain and other countries, and the demo (display) model prototype of the Swedish JAS-39 fighter equipped with F414 engine, and the two-fold sonic Concorde passenger aircraft jointly developed by the United Kingdom and France.

In addition, there are some special cases where the use of afterburners cannot be directly used as a criterion for supersonic cruise capability. For example, the SR-71 Blackbird reconnaissance aircraft is designed to close the passage of the combustion chamber at high speeds, and send all the airflow to the rear combustor, that is, the ramjet engine mode that directly uses the rear combustion engine as the power. There are also some models of supersonic cruise, which requires the afterburner to be turned on first to break through the thrust bottleneck in the transonic phase, or to use a special flight path to turn off the afterburner when it is fully entered into supersonic speed.

As for large civil aircraft and bombers, it is easier to cruise at supersonic speeds, because their larger fuselages can carry more fuel, and the cooling of the engines is easier to solve, as the XB-70 and the Concorde have done, but the noise problems caused by them are more difficult to solve, and the practical application is less.

In layman's terms, it means that it does not need to dive, and can fly supersonic for a long time in level flight and small angle climbing.

Supersonic cruise occurs when an aircraft flies at Mach (i.e., times the speed of sound) for more than 30 minutes without afterburner.

The aircraft can fly at supersonic speeds for more than 30 minutes without afterburner on the engine.

Afterburner is a state of overload of the engine, at most a few minutes, otherwise it will burn out. The 3rd generation aircraft must turn on the afterburner to be supersound, which is the advantage of the 4th generation aircraft - the speed of the soldiers.

To use an analogy, an ordinary engine is equivalent to an ordinary CPU, and under normal circumstances, it will not exceed the screen, and if you turn on the afterburner, it is equivalent to the CPU picking a few pins to exceed the screen. The metaphor is not appropriate, but it is a meaning.

The supersonic cruising of the fourth-generation aircraft means that it can fly at supersonic speed without afterburner, as for what is the role? An airplane is a platform, you can only do other things if you fly fast, quickly enter the war zone, quickly leave the battlefield, increase the muzzle velocity of the missile, and see how you use it.

Supersonic cruise is a supersonic cruise flight that can be carried out for several hours without afterburner, and the average fighter can only fly at supersonic speed for a few minutes to ten minutes after entering the combat state. The role of supersonic cruise: 1

Increased combat radius by 2Supersonic Penetration 3Quick entry 4

Quick detachment 5Increase the muzzle velocity of the missile by 6Evade missile attack 7

Increases the difficulty of enemy interception.

One reason is that aircraft can fly faster, get out of danger zones or go to battle. Another important reason is that the object reaches supersonic speed in the process of just beginning to pass through the speed of sound consumes the most energy, if the fighter is supersonic, then the missile on the fighter is also supersonic, there is no need to consume valuable fuel on the missile to accelerate the breakthrough of the speed of sound, but to continue to accelerate, so that the speed of the missile can be increased, the faster the missile, the less easy it is for the aircraft to detach, you can improve accuracy and destruction.

To put it simply, when you first found someone, before you had time to strike, they finished attacking and left, and you wanted to chase but couldn't catch up.

Supersonic cruise is actually pursuing the performance characteristics of second-generation aircraft.

Fourth-generation aircraft differ from fighters of the previous four generations.

The fourth-generation aircraft here is the Russian standard (i.e. the F-22 is a fourth-generation aircraft). One of the fourth-generation aircraft has a regenerative energy that answers "supersonic cruise", that is, it can maintain a supersonic state all the time. Now the third-generation aircraft equipped with more equipment can only fly at supersonic speed when the afterburner is turned on, but there are restrictions in all aspects, first of all, fuel restrictions, fighter fuel restrictions, generally 1 minute of afterburner is equivalent to reducing 5 to 10 minutes of endurance time, 5 minutes of afterburner aircraft must return; The second is that there is wear and tear on the engine, and the afterburner will increase the temperature of the turbine disc for a long time, which may lead to the melting of engine parts and cause flight accidents.

Therefore, it cannot be driven for a long time in practice, and is only used in air combat or high-speed penetration and high-speed volley.

Whether a pilot can support it is not the speed of the fighter, but the acceleration of the fighter. Just like the F-22 is always in supersonic mode, the pilot is fine, as long as the acceleration is not too high. The overload of modern fighters can generally reach 6 g, but it is only accelerated for a short time, and the pilot must be able to support it.

Hello landlord, fighter jets are coming (supersonic cruise since.)

The first one didn't understand.

What does it mean to copy bai the latter one or.

It can be simply said that supersonic cruise can quickly hit the opponent and leave the battlefield quickly This can greatly improve the survival rate of the fighter Supersonic cruise can also reduce the probability of detection by the opponent's radar In short, this function can improve the survival rate of the fighter This is also a necessary ability for the 4th generation aircraft This is just a personal understanding If there is a mistake, you can point out Thank you.

Fighter jets can fly at supersonic speeds, which does not mean that they can cruise at supersonic speeds.

The old eight's aircraft is still the craftsmanship of the oldest second-generation aircraft, and it is still a rivet structure 60 years ago. There is no wing-body fusion technology. Supersound for a long time will not be able to stand it.

None of the fighters in service, with the exception of the F-22, can cruise at supersonic speeds, the main point is that the engines are not good. Those aircraft that claim to be able to fly at supersonic speeds can only achieve short-term supersonic flight with afterburner, and at this time the fuel consumption is very large.

Supersonic cruise is a standard for measuring fourth-generation fighters, and the Jian-8 can only be called the third generation at most, so how can supersonic cruise be achieved.

The engine lacks a consistently high thrust output.

Because the J8ii is a track of second-generation technology, it can't run a third-generation car.

My computer is a new computer that I just bought, but why windows98 can't play wow is strange.

The body can not withstand the engine, the aerodynamic shape.