How to solve the contradiction between the engine of a fighter jet and the speed

At this stage, human technology can reach and can be the best aircraft speed bottleneck has the following signs:

1. In the transonic period, almost all the aircraft during World War II and before were a combination of piston engine + propeller. The low-altitude and low-speed performance of this power mode is excellent, but when the propeller speed reaches close to the speed of sound, its efficiency will decrease, and the closer to the speed of sound, the lower the efficiency, almost becoming a "wall", and the air flow can hardly pass through, so it is impossible to complete the power requirements of transonic speed;

2. In the sonic stage, the jet engine, the early structure is a turbojet structure, and successfully broke through the sound barrier, since then, this kind of engine has continuously rewritten the speed record for human beings, and has been widely used in various types of aircraft, especially military aircraft, around the 70s of the 20th century;

At the same time, another type of jet engine "turbofan" engine was used on a large scale in military aircraft, especially fighter aircraft, after the 70s of the 20th century, due to a breakthrough in material science, single crystal materials can achieve the temperature barrier of the leading edge of the blade;

3. The hypersonic stage, which is the direction of human speed in the future, refers to factors that are more than 3 times. The same is due to the reason of the blades, when more than 3 times the factor, it will also become a wall that obstructs the air flow, therefore, in the future, a jet engine that uses the air intake tract and compression chamber to compress air will be used, and the ramjet engine used on some missiles is the direction of future use, such as the Russian "Ruby" anti-ship missile, and there is currently another technology called: scramjet engine is being tested, and the theoretical speed can reach more than Mach 6;

No matter how materials science develops, it is impossible to make the aircraft 0 self-weight; In the case that the aircraft itself maintains a certain dead weight, there is only one way to increase the thrust of the engine.

There is something wrong with your problem. I only saw one of the subjects, "speed", and I didn't see the other subject, so I can't ask you another question about this question, and ask it again after thinking about it.

Presumably, you may be asking: how to solve the contradiction between the "engine of the fighter" and the "speed of the fighter"?

There is no contradiction. Because the former is an important part of the latter, there is no contradiction between the two.

There is no contradiction between the power and speed of the jet engine.

Propeller engines are indeed contradictory, and there is no way to solve them. This is one of the reasons why propeller planes cannot fly in supersound.

It seems that there is no contradiction in increasing the output power of the engine and increasing the speed?! The performance of the engine is directly proportional to the speed.

In the past, jet engines were turbojets, and although the turbofan type was economical, it was bulky. The military effect is not good.

Vector thrust simply steers the power of the engine and does not change the nature of the engine. Even more bullish 13 is the ramjet engine.

1, the vector thrust you said is not an engine type, but an engine technology, engine types have turbofans, turboprops, turboshaft jet engines 2, yes 3, the principle performance is to find it yourself, too much.

4. The types are different and there is no direct comparability.

5, I don't want it.

A turbofan engine is to add a fan in front of the turbojet engine while adding ducts to the outside of its body, thereby increasing the power and fuel efficiency of the engine. The principle is because the turbojet engine emits hot air, so in fact, the heat energy generated by the engine's fuel combustion is converted into the kinetic energy of the air, and the other part is converted into heat loss, while the turbofan engine realizes the kinetic energy of converting a part of the energy into cold air, thus achieving energy saving.

For more information, please see:

Fans and jets.

It's different to get power!

The fan is the impeller that pushes the gas to achieve the opposite force.

Jet is the backward ejection of gas to gain reverse momentum.

Not so good indeed. Taihang, which began to boast in 03, has not completely solved the problem until now, mass production.

It can be said that Chinese planes are not good, and engines are even worse. Not to mention that it is not comparable to the United States, it can be said that it is not comparable with Europe. China has long been dependent on Russia.

In fact, you can see that China has been talking about independent research and development and independent innovation during the military parade, and you will know it as soon as you look at the J11 imitation su27.

Almost all of them imitate the former Soviet Union and Russia, and most of the models are currently imitating Russia's third-generation fighters, but in fact, due to financial and technical problems, they are worse than the third-generation fighters.

It's much better than what China used to do.

Compared with the engine specially made by Russia for the J-11, the copy is not very good.

Although it is often blown on the Internet, there is still a gap between it and the United States for decades

Taihang is also manufactured with the introduction of foreign technology, and its performance is similar to that of foreign mid-range engines, but there is a big gap between it and the F135.

In general, China's engine manufacturing industry is still very backward, in fact, not only aero engines, other engines are not very good. The main reason is that our country did not pay attention to the development of engines at the beginning, just like the large aircraft project, China has now begun to pay attention to the development of this industry, and I believe that in a few years there will be engines that we have independently developed in the true sense. From a technical point of view, the main thing that restricts Chinese engines is materials, and we have not been able to develop blades with high stability at present.

Not so good ! Dependent on Russia ! Import Oh!

For large aircraft such as passenger aircraft, the main consideration is its fuel economy and endurance, and the large bypass ratio turbofan engine has good propulsion efficiency and low-speed performance, because the main thrust of the large bypass ratio turbofan comes from the cold air flowing through the outer duct, so the exhaust temperature is very low, the fan diameter is large, and the afterburner is not installed, so this kind of engine is short and thick, and for fighters, what stands out is its acceleration, thrust-to-weight ratio, and high-speed characteristics, And the large bypass ratio engine can not meet this requirement, and because the fighter is small in size, it is not suitable for the installation of a large bypass ratio engine, so the engine with the fighter is commonly used with a small bypass ratio mixed exhaust engine, the bypass ratio is about about about, in order to obtain additional power, the afterburner will also be installed in the exhaust channel, and more than 25% of the thrust can be obtained. However, this kind of engine exhaust temperature is high, thermal efficiency is low, low-speed performance is poor, fuel economy is also poor, but high-altitude and high-speed performance is outstanding, and the engine thrust-mass ratio is greater than 10, which can improve the maneuverability of the aircraft in the air. Nevertheless, civilian large bypass ratio turbofan and military small bypass ratio turbofan often share a platform to research and development, from its core machine (low-pressure compressor, high-pressure compressor, combustion chamber, turbine, transmission shaft, lubricating oil system, fuel system, air intake regulator and other components) can be derived from various engines for different purposes, such as China's flying leopard equipped Spey, there is a civilian version, and the F101 said upstairs is also a very versatile core machine.

The main thing is the difference in the bypass ratio, and whether there is afterburner. The bypass ratio of the airliner is large, so the fan diameter is large, which saves fuel, but also has a large windward resistance.

However, the core of the two engines (high-pressure compressor, combustion chamber, high-pressure turbine) is partially similar. In fact, the core engine of the CFM56 engine of the Boeing 737 is the core engine of the military F101 engine (B1-A aircraft). The new F110 engines (F-15E, F-16) used the CFM-56 compressor.

The engine of the passenger aircraft is basically a turbofan engine, and the diameter of the fan is large, which is relatively stubby compared to the whole engine.

The engines of military aircraft are mostly turbojet engines, do not have large-diameter fans, and most engines have afterburners, resulting in relatively slender engines.

These are two engines for different purposes, and they also differ in appearance.

Star Trek has seen too much... The technologies that can now be related to Star Trek are the transparent aluminum developed by American scientists and the quantum imaging carried out by Chinese scientists.

Everything is just a theory and only appears in science fiction films.

Science fiction** don't take it seriously, people can't even control nuclear fusion.

No. How can it be solved so quickly? The advantages of others are also the advantages accumulated for decades, and aviation power is the embodiment of a country's comprehensive national strength, which involves many aspects, and is not a problem that can be solved in a short period of time.

Chinese planes do not have engines, only American planes have engines,. China does not need an engine, and the anti-China forces are deliberately belittling China.

Although it is said that there is now a domestic Taihang engine, it has not completely solved the manufacturing of high-performance engines fundamentally, and it is still very dependent on Russian engines.

It's all excuses, in fact, the quality of the people is not good, look at the state-owned enterprises and those monopoly enterprises, that is not a negative work, work hours are on the Internet, chatting, playing games, a few are engaged in scientific research, and finally get some success out, maybe the credit was robbed by the leader, so who will use their brains.

The old one is solved, and the new one is reappeared.

The domestic copycat Taihang engine has continuous problems, so only the Maozi engine can be imported, and the thrust is about the same as the imported one, and the key is the reliability problem.

It is said that the domestic ones have reached a certain level, but they are still worse than the military powers such as Russia!

China has some deficiencies in the research of high-temperature resistant materials for military aircraft engines.

This question is a misunderstanding.

At present, Taihang is mainly due to poor reliability, and its performance is not inferior to that of the Russian-made AL-31

The main reason is the gap in processing technology, so we don't actually have a domestic engine yet.

China's Dongfeng series engines are already very good in terms of performance, and there is no problem at all with the J-10, but Russia is very stingy in this regard, they use the Su-33 as a threat, if China does not buy their engines, the Su-33 Su-35 they will not sell to China.

Respect your country. I see you are all Chinese. China's military industry has long exceeded the expectations of people around the world. The reason why it is not propaganda is only because of the military strategy of our country.

There is no comparison!

China can't even get a qualified engine, how can it be compared with others.

Alas... The Chinese will only blow ... What supports domestic products, phew...

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