Super Weapon Swap System

For the eagle people, they also have their own reasons. Although the J58 is a cross era engine with variable cycle design, after all, this engine was produced in the 1960s. Now it is in the late 1980s. Twenty years later, the once advanced engine has fallen behind. This is also one reason why they can take it out.

Of course, this is only one factor, on the other hand, that is, the eagle people have a newer variable cycle engine!

This early engine has many disadvantages. As a combination of turbojet engine and ramjet engine, it has many problems in the connection of high and low speed. At that time, there was no advanced digital control technology, and the whole engine control was difficult to be very accurate. For Eagle country, this engine was only an introduction.

GE has been fascinated by the variable cycle engine. Now, among the new generation of fighters in Eagle country, there are two prototypes competing, yf22 and yf23. Among them, yf23 is more sci-fi. In addition to its more avant-garde shape, such as the unique V-shaped vertical tail, it also adopts a more modern engine.

"President Qin is right. Our intelligence personnel got some information from Eagle country." general Lin said, "Eagle people have prepared two engines for the selection of the next generation of aircraft. One is a conventional turbofan engine, code yf119, and the other is a variable cycle engine, code yf120."

General Lin waited for Qin Guan to come here before he threw out the news. Obviously, he also supported it. The eagle people were willing to give one of this engine to their own side because they already had a more advanced engine.

Qin Guan was stunned by this news, not because he didn't know it, but because he didn't expect that the information of his own intelligence department was so well-informed and explored so much about the fourth generation aircraft project of the eagle people. You know, it's still a secret now.

Funny to say, in this competition, Lockheed YF-22 and Pratt Whitney yf119 won and became F-22 fighter and F119 engine. The eagle air force originally pursued advanced technology and height. As a result, the yf23 with science fiction technology and the super advanced yf120 lost the election.

Eagle people must have suffered enough losses on the F-15 engine. Once bitten by a snake, they are afraid of the well rope for ten years.

Now, general Lin has stated his position. We must not fall behind!

Variable cycle engine will become a trend in the future!

Although both are variable cycle, yf120 and J58 are still different. J58 is a turbojet engine. When changing the cycle, the air flow does not pass through the front compressor, but only the rear combustion chamber. At high speed, the air itself has been compressed. This is the variable cycle of turbojet and ramjet engine.

The yf120 is for fighters. It circulates back and forth between turbojet and turbofan engines.

Turbojet engine is commonly used in the past. This kind of engine has small windward area, so it has very good high-altitude performance. A small aircraft such as MIG 21 can also achieve the maximum speed of Mach 2, which is inseparable from turbojet engine. However, this kind of engine is deficient, which is fuel consumption. An external culvert is added outside, which becomes a turbofan, The fuel consumption rate has been greatly reduced. The engine of the third generation aircraft must be a turbofan, otherwise the range will be a mess. At the same time, the thrust is much greater than the turbojet.

However, not all turbofans have advantages. Due to the addition of the outer culvert, the windward area of this engine is larger, which increases the resistance. Especially at high speed, the outer culvert is not good, but will become a kind of resistance.

Therefore, the high-altitude performance of Spey engine is in a mess, which is the reason for the front fan, and the engine of MIG 31 has been upgraded into a turbofan. Although the range has been improved, the maximum speed has slowed down, which is a large part lower than that of MIG 25 using turbojet. That's the way.

In order to develop the advanced fourth generation aircraft, the eagle people also used all their scientific and technological strength. In terms of engines, yf120 engine is obviously a more sci-fi one.

F119 engine adopts a large number of the most advanced technologies. It is the first engine with a thrust weight ratio of 10 in the world, but it is still only a conventional low bypass ratio turbofan engine.

And yf120? It adopts valve control, which can open the outer culvert when necessary to realize the function of turbofan; After the outer culvert is closed, the vortex jet function is realized. In particular, there are two groups of such valves. One group is in the front to divert part of the exhaust of the fan to the outer culvert, and the other group is in the back to divert part of the exhaust of the high-pressure compressor to the outer culvert.

This design that makes the engine change is obviously more advanced. In this way, at low speed, the engine is a turbofan engine, which can provide great power. At high speed, close the outer culvert, which is a turbojet engine. At this time, the windward area is small, which is convenient for sprint flight. What's more ingenious is, This engine can smoothly transition between turbojet state and turbofan state, taking into account the fuel-saving characteristics of turbofan at subsonic speed and the high-speed characteristics of turbojet at supersonic speed. It can be said that this engine reflects the scientific and technological power of Eagle country.

Unfortunately, the Eagle Air Force gave up this engine because it was too advanced, too sci-fi and failed to avoid being too avant-garde.

Of course, they didn't really give up, but they didn't use it on their fourth generation aircraft, and they continued to allocate funds for research and development. After all, they had suffered from being a dominant company and didn't want Pratt Whitney to dominate the power any more. The nightmare of the queen of the F-15 hangar was still vivid, so they were also allocating funds for this new engine, When the F-35 was developed, the engine changed into yf136 and competed with yf135. As a result, it failed again. Until this failure, the engine was finally abandoned.

By this time, the engine has not only simply changed the cycle, but also entered the adaptive level. In addition to the variable circulation between turbojet and turbofan, it also further automatically adapts to the working environment.

Now, when general Lin mentioned the news, there was a flash of inspiration in Qin Guan's brain. The J58 engine given by the other party was only an introduction. If he took other engine technologies, such as yf120 or even yf136, and digested and absorbed them, would it greatly promote the development of his own aviation power system?

If it does, the domestic aviation technology will be superior to the global level.