The ups and downs of life in the Siheyuan

The director of the institute is named Sun Dehai. He is a tall, thin man with glasses, a full head of hair, and an approachable smile.

"Comrade Li Yuan, we have finally come to you." The old man stepped forward enthusiastically and stretched out his hands from afar.

Li Yuan walked a few steps quickly and held the old man's thin palm.

"Old Dean, I've kept you waiting for a long time," Li Yuan made a pun.

“As long as you can come over and wait as long as you want, we’re happy.

Being able to design such an excellent aero engine as the Turbofan 8 is a testament to your ability.

It is no exaggeration to call him the first person in the country.”

"Oh, you are always flattering me. I have not offended you, hahaha..."

"It's not an exaggeration at all. The turbofan 8, titanium alloy and 5-axis precision machine tools are all your works.

Any one of them can be exiled for eternity and be respected by future generations."

"Oh, I don't dare to take it, I don't dare to take it." Li Yuan was praised so lightly.

After greetings, a group of people entered the workshop, and some workers behind them were busy unloading goods.

"Teacher, as required, the processing parameters of the fan blades have been input. Please help check them."

Arriving in front of the machine tool, Hao Wei finally took the opportunity to talk to Li Yuan.

Li Yuan stepped forward to call up the parameter check, and then nodded to Hao Wei, "No problem."

"Gong Zhao, just start it," Hao Wei said to a young man in his 30s.

Under the gaze of so many people, the young man felt a little at a loss.

"Don't worry, my teacher has already checked it, just operate as usual."

The other party took a deep breath, finally suppressed his uneasiness, picked up the parts blank on the pallet, put it in the clamp to fix it firmly, closed the protective door, and pressed the start button.

I saw a laser beam projected on the part to quickly mark the position and complete the position correction.

Next, it only took less than 5 minutes for a fan blade to be processed.

Remove the processed fan blade from the fixture and start measuring.

The data was quickly obtained, and the inspector shouted excitedly: "Passed!".

Suddenly, the people around him burst into thunderous applause.

Today's engines only lack high-pressure fan blades and turbines of various specifications. These parts require too high materials and processing precision, and it has been impossible to produce qualified products.

Now that both problems have been solved, the next step is much simpler.

Two days later, all parts were processed.

Hao Wei has been assigned to familiarize himself with the control program to ensure the best ratio between power output and fuel consumption.

Next, comes the formal assembly of the engine.

"Comrade Li Yuan, I heard from the master craftsmen that the assembly level of your model is very high. Please personally assemble this prototype."

Li Yuan also wanted to see the ultimate characteristics of the turbofan 8, so he did his best and agreed.

Assembly begins. Under normal circumstances, master craftsmen need to assemble while looking at the drawings.

But when Li Yuan arrived, he didn't even look at the drawings because the design model was in his mind.

In addition, I have personally assembled a model, so I can't say that I am familiar with it, at least I can follow the steps step by step.

The most surprising thing is that during the entire engine assembly process, the gantry crane was not used once and was all done by hand.

This fact calmed everyone watching.

Li Yuan's movements were smooth, and he explained the essentials while assembling. The senior fitters next to him all took notes with pens, for fear of missing a sentence.

Seeing that they were so serious, he would repeatedly explain and demonstrate parts that were difficult to assemble.

None of these senior fitters looked down upon Li Yuan because of his tenderness, and they all respectfully called him "teacher."

Afterwards, Li Yuan kept lamenting: It was precisely because of their humble and studious spirit that they launched the famous Kunlun and Taihang aviation engines in later generations.

One week passed quietly. Li Yuan assembled one engine, took a short rest, and then started assembling the second engine.

The turbofan 8 aero engine is composed of an air inlet, a fan, a high-pressure compressor, a combustion chamber, a high-pressure turbine, a low-pressure turbine, an afterburner, a nozzle and a control system.

The air inlet has 21 variable-curvature inlet guide vanes. The leading edge of the guide vane is fixed to pass hot air to prevent ice, and the trailing edge is adjustable.

Fan, 3-stage axial flow type, made of titanium alloy. Maximum speed r/min. The first two-stage rotor blades have mid-blade damping bosses.

High-pressure compressor, 10-stage axial flow type, with adjustable rectifier blades in the first three stages. The rotor is made of forged discs and adopts hot isostatic pressing process.

Combustion chamber, short annular shape, smokeless design. The combustion chamber nozzle is installed at the front of the combustion chamber, and the capacitor discharges ignition.

High-pressure turbine, 2-stage axial flow type. The first stage uses impingement cooling, and the second stage uses convection cooling.

Low pressure turbine, 2-stage axial flow type.

Afterburner, variable area fuel nozzles for soft ignition with minimal pressure.

Nozzle, balance beam convergent-expanding type.

All control parts use magnetic switches, and the temperature, vibration and other performance monitoring of each component are carried out.

The materials used in all key parts are high-temperature nickel-based alloys, heat-resistant nickel-chromium-iron alloys and various titanium alloys.

Another week has passed, and the first engine control program has been tuned and is now undergoing parameter testing on the test bench.

Soon, the test parameters were presented in front of the leaders.

Li Yuan picked up the test sheet in front of him, and all the indicators he focused on met the requirements.

Maximum afterburning thrust: daN;

Middle thrust: 7812daN;

Afterburner fuel consumption rate: 2.15kg/daN*h;

Maximum continuous fuel consumption rate: 0.55kg/daN*h;

Thrust-to-weight ratio: 8~10.9;

Weight: 1.2kg;

Bypass ratio: 0.25~0.45;

Maximum diameter: 1.12 meters;

Length: 5.62 meters.

After reading it, Li Yuan was very happy, and some parameters had surpassed the reference object F100.

This shows that he not only fully digested and absorbed America's F100, but also made breakthroughs.

It is estimated that the biggest breakthrough is the control system.

On the basis of the F100, he improved the control system by referring to the past turbojet 6 modifications.

Coupled with the use of a high-pressure co-rail fuel injection system, both fuel consumption and response speed have been greatly optimized.

The variable bypass ratio allows the engine to switch freely between high-speed thrust and cruising.

At this time, whispers came from the venue, and the sound gradually became louder and louder.

At this time, Dean Sun knocked on the table to suppress the noise.

He first looked at Li Yuan on the left, "Comrade Li Yuan, can you tell me first?"

"Okay, Dean Sun.

Turbofan 8 basically meets the design expectations, and some parameters are better than the design parameters."

Dean Sun nodded and looked at the second person in the right row, "Qin Gong, what do you think?"

“To be honest, when I got the design drawings, I knew that this engine was very well designed, but I always had doubts about its design parameters.

When I got the test data, I really couldn't believe that these were real.

According to these data, this is not the engine of a third-generation aircraft at all, and it is completely comparable to the newly announced fourth-generation aircraft of America.

In this way, our J-8 is not very suitable for this engine, and it is suspected of being a big horse and a small car."

Dean Sun ordered several engineers one by one, and they basically all agreed.

Finally, the old dean looked at everyone seriously, then turned to the person on his right and said, "Old Shen, please read out the confidentiality regulations."

The other party nodded solemnly, stood up and led everyone in reading out the confidentiality regulations.

"First, general principles:

. . . . . . "