Compared with the fifth-generation fighters in service, we always like to generalThree models from China, the United States and Russia are used as examples
Among them, the Russian Su-57 can reach a maximum speed of Mach 2, and the American F22 can reach a maximum of 2Mach 25, so what is the maximum speed of the J-20?
Let's take a look firstRussian Su-57 fighters,Russia had fifth-generation fighter projects as early as the 90s of the last century or even earlier, but they were stillborn.
For various reasons, the fifth-generation fighter in the real sense will not be officially put into service until 2021, later than the J-20, but the number has been in a state of "constipation".
It stands to reason that fighters that entered service later should have received technical dividends in many ways, butSu-57 does not seem to have it
Avionics is not much to say, this is the root cause of the disease that fell during the Soviet period, and it has not been solved until now.
In terms of stealth, the aerodynamic design of the Su-57 is still more conducive to stealth, but due to the retention of a large tail hang, coupled with the unsatisfactory stealth materials,Stealth is the worst of the fifth-generation fighters in service.
Some people call it the "flattened Su-27", which shows that when the Sukhoi Design Bureau developed this fifth-generation fighter, it still did not completely get rid of the influence of the Soviet-style flanker.
The power of the Su-57 is twoAL-41F1-117S afterburner engine, its maximum thrust is 107 kN, afterburn thrust is 167 kN, and the speed of the fighter can be reached with full afterburnerMach 2
Judging from the performance data alone, the Su-57's engine is basically first-class, but in fact, the Al-41F1-117S afterburner engine is not as easy to use as everyone thinks.
It is an improved version of the AL-31F engine, which is still conservative in many technical aspects.
This also leads to a big problem with the Su-57, that is, the control torque formed by the steering of the engine nozzle is too large, which makes it difficult to control the balance of the fighter.
In addition, the level of Su-57 avionics is not high, so pilots are required to have a strong oneSelf-judgment and operational ability
The Russian side is also well aware of the pain points of the Su-57, and intends to replace it with a new engine, which can reach 18 tons of thrust and will be optimized in many ways.
From all points of view, the Su-57 is one of the fifth-generation fighters in serviceThe bottom one
After admiring the Russian Su-57 fighter, let's take a look at the United States, the United States has a total of two fifth-generation fighters, which areF22 and F35 fighters.
Among them, the F35 is a single-engine fighter, and although the F135 engine it is equipped with is advanced enough, it is "difficult to support alone" after all, which also leads to the fact that the maximum speed of the F35 will not exceed Mach 2, which is not within the scope of today's discussion.
Another F22 fighter is the protagonist of today, and its power is mainly twoF119 turbofan engine, the maximum speed can reach 2Mach 25.
The F119 engine has a history of several decades since its appearance, but to this day, it is still a first-class or even top-notch fighter engine.
The maximum thrust of a single F119 engine is 104 kN, and the afterburner thrust is 156 kN, which is worse than the performance of the Su-57 engine in comparison, but the F119 engine is definitely better to use.
First, the F119 engine is more reliable, relatively speaking, this engine has a simpler structure and a smaller number of parts, but its performance is higher than that of the previous engine (F100).There is a leap forward
This also means that the F119 engine is more reliable than the F100, and the reliability of the F100 has been proven in many fighters, which is beyond doubt.
Second, the design of the F119 engine is excellent, it uses a 3-stage fan, a 6-stage high-pressure compressor, an afterburner and a 2D vector nozzle.
Among these parts, there are many details of the engine technology of the United States, which are better than the Su-57 engine in many aspects.
The third, the F119 engineThe compatibility with the F22 is also very good, the latter can almost give full play to the power performance of the former, and truly realize the "integration" of aircraft and engine.
This also makes the thrust level of the F119 engine inferior to that of the Al-41, but the speed of the F22 with full afterburner can exceed that of the Su-57 and reach2.Mach 25.
It can be seen that to see whether an engine is good or not, the thrust is one thing, in addition, the design structure of the engine and other factors are also very important.
In addition to the excellent power system, the F22 fighter's ** system is also very good, with a large built-in bomb bay, which can carry more advanced air-to-air missiles.
However, the F22 also has significant drawbacks, first of all, it'sAvionics systemsIt belongs to the technical level of the last century, some of which cannot keep up with the times, and now the production line has been withdrawn, and there is basically no room for improvement.
Secondly, the stealth of the F22 fighter is not very good, and it can only rank second to last among the four fighters in active service.
Finally, there is our own J-20 fighter, which is powered by two turbofan 10C engines, and the thrust data cannot catch up with the F119 and the Russian Al-41.
But at many technical levels, we have made up for the gap in terms of engines, so that the J-20 will not be its disadvantage in terms of super-maneuverability or maximum speed.
So far, we still can't know exactly what the maximum speed of the J-20 isThere is a saying that it is 2Mach 45, some say 2Mach 8.
Let's comprehensively analyze and judge the maximum speed of the J-20 from the aerodynamic layout of the J-20, its maximum range and engine performance dataProbably in 2Around Mach 6, much stronger than the F22 and Su-57.
However, it is not the end of the J-20, and the speed and maneuverability of the J-20 are expected to be better optimized after the turbofan 15 engine is replaced in the future.
This also means that the J-20 may surpass the F22 fighter in an all-round way and become the best fifth-generation fighter.
In addition, the J-20 still has potential to be tapped in many aspects, for example, it is currently the world's largest fifth-generation fighter, and it can be slowly dug deeper in the two-seat version.
The two-seater version of the J-20 could be the core component of a loyal wingmanThe future is promising
Project Sword
References:
1] Globe.com: "T-50".
2] F-22A Raptor Advanced Tactical Fighter, United States of America Air Force technology.
3] Observer.com: "Weekly Military Review: J-20 "Complete Body" is here, will the domestic sixth-generation aircraft be far away? 》