Before returning to the college entrance examination, I became popular in the science circle

Fortunately, now she has the assistance of the Absolute Derivation Space of the Enlightenment Stone, which is clearer and more intuitive than just trying to build a model in her mind before. She can physically perceive the advantages and disadvantages of the optimization direction, and can speed up the optimization process.

In the limited time, compress the time as much as possible, and it should not be a hindrance.

STOVL fighter jets are actually the inevitable and direction for the sustainable development of future aviation technology.

Most of nature's sailing microorganisms actually rise and fall vertically or stubby. From flies, mosquitoes, and insects to most birds, no microorganism has ever been seen flying on Earth.

In order to facilitate take-off and landing, a specially built road runway was actually a technical shortcoming and a second-best option.

Most large birds can use river gliding to aid flight.

But in real life, since a large number of them were taken into active service, the whole world immediately realized that they were taking too much load suddenly in the battle on the ground and in the combined take-off and landing at sea.

Stones from other mountains can attack jade, Wu Tong pondered, and the confidential information she had read flashed through her mind. From the equipment history, the STOVL fighter's propulsion system has three engine models.

That is, the Harrier "Pegasus engine" from the British side, the R-141+RD-79 engine from the big brother's Yak-41 next door, and the F135 engine from the M country.

These three engine models also correspond to three different types of technical solutions.

Pegasus engine, the thrust reversal scheme is a rotating exhaust nozzle, the aircraft takes off and lands vertically, and the nozzle sprays downward.

The biggest feature of this engine is "integrated lift and thrust", that is, both cruise thrust and vertical lift are borne by one engine.It has a simple and compact structure, small dead weight of the propulsion system, good short take-off and landing performance, and even the ability to take off vertically.

However, the shortcomings are also obvious. Because the rear nozzle sprays hot gas, the problem of exhaust re-inhalation is serious; because the hovering height is low during vertical takeoff and landing, the oxygen-poor high-temperature jet rebounds from the ground and is easily inhaled by the engine again. , reducing engine efficiency and even causing surge.

Taking off vertically consumes a lot of fuel.It is said that once the Harrier takes off vertically, three to a quarter of its internal fuel will be used up, and its combat radius is only about 100 kilometers.

In addition, the large cross-section of the Pegasus engine results in high supersonic resistance, so the Harrier is always a subsonic fighter. In addition, the control system is very complicated due to the adjustable nozzle area and afterburner, which is also a technical problem.

For now, this set of technology has no practical significance and can only be used as a reference in engine history.

The R-141+RD-79 engine of the Yak-41 was successfully developed ten years later than the Pegasus, but accordingly, it is a step further than the Pegasus engine.

The biggest feature of Jacques 141 is "separation of lifting and pushing".The cruise and lift engines perform their respective duties, ensuring the efficiency and effectiveness of the cruise engine, making the Yak the world's first supersonic STOVL fighter. During the test flight, the Yak-141 even reached a maximum level flight speed of Mach 1.4-1.7.

However, shortcomings are still inevitable.The problem of high-temperature airflow in cruise and lift engines is very prominent.When the aircraft hovers, high-temperature airflow is ejected from the engine nozzle and spreads outward after reaching the ground.

A low-pressure area is formed under the aircraft body, resulting in a suckdown effect, which will firmly "suck" the aircraft. This is also the reason why the Yak-36 crashed during its first test flight and failed to take off.Later, due to a series of major changes in national conditions due to the disintegration of Big Brother next door, the optimization of Yak-141 could not continue, and unfortunately it failed.

Finally, it is the F35 engine used by the F-135.

它是在F119基础上发展而来采用F119的核心机三大件：高压压气机、燃烧室和高压涡轮。风扇、低压压气机、低压涡轮重新设计的F135发动机。用于短垂F-35B的型号为F135-PW-600，简称F135发动机。

There is a rumor in the circle that during the selection process of the vertical propulsion technology of the F-35B, part of the design of the Yak-141 was copied.

In terms of scientific research, this is actually not funny, not to mention, it is more of a reference!It could be said that he was taking advantage of someone's situation, or it could be described as something even worse.However, they should not underestimate what lies across the sea.

Being able to develop one's own technology while learning from others is also a breakthrough.

They are now able to continuously produce scientific research results. In fact, they are standing on the shoulders of their ancestors. They are based on the foundation of their ancestors' struggle and extending on this basis. It is not that they have no roots.

Across the sea, a major breakthrough was indeed made based on the Yak-141.

The advantages and disadvantages of the F135 engine are also obvious. The advantage is that it continues the Yak-14, separation of lift and thrust, and extended to use push instead of lift.

The airflow of the engine lift fan comes from the low-temperature compressor, and the jet is normal-temperature air. Therefore, even if it bounces off the ground and is inhaled again by the engine, it will not cause surge. This solves the problem to a large extent of the Yak series engines where high-temperature airflow is re-inhaled. Import distortion problem.

At the same time, it also avoids the complex power conditions and reliability problems of multiple engines in one Yak series aircraft.

Just to achieve the above series of advantages, the structure of engine + drive shaft clutch + fan results in too large space, complex structure, and too large structure. Naturally, it also brings excessive weight, excessive volume, and excessive weight. The heavy engine weight and vicious cycle lead to the core problem of too small bomb load and insufficient deterrence.

The wake temperature is high. Even though the suckdown effect of the Yak series has been greatly solved by adding a low-temperature compressor and converting the jet into normal temperature air, the tail flame temperature is still as high as more than 900 degrees, which still has excessive scorching effects on the aircraft carrier deck. Burn load.

Although it will not cause the steel structure of the deck to melt and collapse, it will still cause deformation damage, enough to break the heat-resistant concrete of the land airport into snow flakes, or completely melt the asphalt.

Moreover, in the low-speed mode of vertical take-off and landing, the auxiliary intake valve of the lift fan is easily damaged due to the high wind pressure. This is a shortcoming of the fan...

However, even with so many shortcomings, the F-35B still succeeded in its test flight.

Confidential information shows that in the past two or three years, the F-35 has continuously announced successful test flights and successful research and development, and announced that it will be deployed one by one in service within the past two years, bringing benefits to the entire world. A lot of pressure.

However, if Wu Tong remembers correctly,

In that future memory, the F-35B crashed more than once. Eventually, the entire F-35 was grounded ten years later.

It's not that Wu Tong laughed at the arrogance of her opponent, but that she wanted to use this to alert herself. In the next engine optimization, these detours and flaws discovered by the International were all what she wanted to avoid.

Being blindly arrogant and looking at other people's jokes will eventually become a joke sooner or later. Wu Tong will not let himself make such a stupid mistake!