The design plan of the Coast Guard-700 was quickly finalized. After that, Zhou Yan had to continue to compete with the turboprops.
Fortunately, the design and production system of Wotu's turboprop have been perfected. It took half a year to design the drawings and half a year to produce the parts. By the time Zhou Yan got his master's degree, Turboprop 10 had already entered a long testing phase: ground testing, high-altitude platform testing,
Then it is installed on the flight test platform and tested in the sky.
Although this is good news for the country, it is not good news for Zhou Yan. After receiving his master's degree, his tutor Liu Yiming kicked him out of the program on the grounds that Zhou Yan could independently design aeroengines.
"Gate": It is recommended that he follow his new mentor and focus on carrier-based fighter jets.
Now, we finally return to Zhou Yan’s basics: in the “Great Power Aviation” series of missions, Lin Mo, possessed by Zhou Yan, actually flew the J-15 from the deck, and even participated in battles;
In the "Sky Hunter" tutorial, Zhou Yan has already maxed out the Soviet fighter planes...
The J-15 we plan to put on the ship is based on the J-11 and Su Sansan's prototype T-10K3. The overall structure of the two aircraft is similar, that is, the T-10K3. Because of the ship, the body structure has been strengthened accordingly.
.
For Rabbit, if you want to reproduce the Rabbit version of the T-10K3, you not only need to strengthen the J-11 body accordingly, but also need to strengthen the power, improve the aerodynamic performance to adapt to the sea surface environment, and the entire machine needs to be salt-proof.
Anti-fog, treatment.
Zhou Yan had just been responsible for the design of turboprop engines, so as soon as he joined the team, he was entrusted with an important task: improving the "Third Uncle".
Although when Beifang exported "Uncle Three", it was clearly required that our rabbits not be "copycats", and the engine was also "encrypted".
However, this did not trouble Zhou Yan. As soon as he joined the team, Zhou Yan submitted a "certificate of investment" - a complete set of Chinese drawings of the AL-31F.
Then, Zhou Yan's prestige was immediately established, and with the support from above, the improvement work naturally went very smoothly.
Fine-tuning the fan blade profile to improve air intake efficiency; improving compressor materials and cooling methods; modifying the shape of the annular combustion chamber and improving low-pressure and high-pressure turbine materials to further increase engine power; and finally, improving the materials and processing technology of the casing.
Overall weight loss…
With the support of experience and the rich information on Russian engines in his head, it is naturally very easy to improve the third uncle. In his spare time, Zhou Yan can also go to the aerodynamic team to relive his college life.
The chief engineer in charge of the aerodynamic shape was already used to Zhou Yan's "cross-border" behavior. In addition, Zhou Yan was Shen Fei's bag, and a group of people from Shen Fei Design Institute
Engineers, of course, just let it happen.
Moreover, Zhou Yan, who has rich flying experience, can always provide some relatively novel suggestions to aerodynamic designers, which also makes a group of people who are engaged in aerodynamics like to play with Zhou Yan.
Of course, for Zhou Yan, the biggest benefit of joining the carrier-based aircraft team is his free time and being able to go home occasionally...
Although Zhou Yan knew very well that once he chose this path, he would eventually miss a lot of things and owe a lot of people, but he was still very willing to make up for it if he could make up for it.
At first, Zhou Yan was very happy to go home and enjoy the extra family affection, but as time went by, there were something else in the conversation between his father and mother.
"Xiao Feng, you are already twenty-two years old and can get a marriage certificate..."
Can we still have fun together?
Zhou Yan, who was extremely depressed, returned to his job. He was either busy working or preparing his graduation thesis. How could he care about anything else.
Although it is still early for him to graduate with his Ph.D., since Zhou Yan plans to enter the system, he needs to prepare some papers early.
The various instruments and equipment in the Shenfei Design Institute are much more complete than those of the first flight. Taking advantage of this opportunity, Zhou Yan began to study some things related to invisibility.
There are two main categories: one is low-detectability aerodynamic shapes; the other is low-detectability infrared features.
The low-detectability profile originated in 1964 when bear scientist Peter Ufimochev published a rather creative paper in the "Transactions of the Moscow Academy of Radio Engineering" in which he proposed that the reflection of radar electromagnetic waves by objects Strength has nothing to do with the size of the object, but is proportional to the edge layout.
During actual operation, the wing inclination angle is generally designed to be less than 30 degrees. The F-117, the originator of the retired stealth fighter, and most fourth-generation aircraft are designed this way.
But in this way, the main wings of the stealth fighter will be designed at a fixed angle. It is difficult to take into account the maneuverability at various speeds like the previous double delta-wing aircraft. Therefore, the beautiful country equipped the stealth fighter with powerful heart, other countries have followed suit.
Although stealth fighter jets are equipped with engines with a high thrust-to-weight ratio, the angle of the main wings is still designed at a specific angle in order to take into account various environments.
As a result, the few stealth fighter jets in the world all have similar wing angles. Even the J-31 designed by Shenyang Aircraft Corporation was jokingly called a "copycat" product of the F-22 and F-35 by netizens.
One of Zhou Yan's papers uses theory to explain why existing stealth fighter jets have similar wing shapes.
The second paper introduces how to use the engine's convergent nozzle to process the engine exhaust so that it exhibits a specific infrared wavelength to avoid being tracked by infrared missiles. As soon as this paper came out, basically I have already stripped all the F-35 girls who have not yet been interviewed.
The remaining papers return to the invisible aerodynamic layout.
However, this article is no longer about digging into the country’s stealth fighter jets, but about how to transform existing fighter jets into stealth.
Of course, Zhou Yan also had a small thought in his paper: the J-31 currently flying down the ground has an unpleasant appearance and size. If it wants to catch up with the beautiful country's stealth carrier-based fighter, it has to find another way.
This chapter is not over yet, please click on the next page to continue reading! Zhou Yan is eyeing the J-15, but the "upgrade" plan is somewhat different from the Su-57 in the north.
Although many years later, Mao Xiong came up with the invisible Su-57 series, but in the eyes of insiders, it is basically a squashed Su-27: the same central lift body layout, the same frame, and similar air intakes ; Only the Su-27's "Unyielding Roar" strength has been straightened out...
The Su-57's static stealth performance is quite good, but when maneuvering, the probability of being detected increases due to the rotation of the pseudo-canards in front.
Therefore, although Zhou Yan's design is based on the rear half of the Su-57, the front half is somewhat similar to the F-35: a diamond-shaped nose and DSI air inlets on both sides.
Because it is "spliced" together, the air intake naturally becomes an S-shape, and this also creates space for the magazine: the main magazine is between the two engines at the rear of the fuselage, and on both sides of the air intake are the auxiliary magazines. Magazine.
The improvement of "Uncle Three" is a systematic project. From the early design, to the mid-term process preparation, trial production, and then to the later trial operation and test flight, the cycle is naturally very long.
So much so that Zhou Yan had already received his doctorate, and the J-15 package was almost over. As soon as he graduated, he was recruited by the Shenyang Aircraft Design Institute.
The next series of tasks were all within Zhou Yan's expectations. After the J-15, there were the J-16 and J-18. After working for Shen Fei for three years, he was ordered to become the commander-in-chief of the J-18.
After that, in order to reverse the decline in the development of fourth-generation aircraft, Shenyang Aircraft Company started anew and established the J-21 plan proposed by Zhou Yan as the main palace; at the same time, he was also responsible for the J-21 engine turbofan-20 chief engineer.
At the age of forty, the J-21 successfully made its first ground flight.
Soon after, Zhou Yan also received a reminder that the main mission was completed...
After receiving the title of double academician, Zhou Yan rushed to the South China Sea Fleet non-stop to participate in various tests of the J-21 on board the ship.
At the age of forty-two, Zhou Yan, also known as Li Tianfeng, finally failed to escape the fate of Shenfei's chief engineer. He became ill from overwork during the sea trial and died of a sudden illness at his job...
When he opened his eyes again, Zhou Yan thought that the tutorial was over, but he suddenly realized that something was not right: he seemed to be in the dormitory of an aerospace development factory of AVIC.
A few seconds later, the system came belatedly: [Copy of the 'Aviation Dream' tutorial, check for omissions and fill in the gaps...]
