bonanza

Chapter 850 Thoughts
"Maomao fist at most!" Yang Lin pouted disapprovingly.

At this moment, the sound in the room stopped, and the little tiger came out dejectedly.

Yang Miao glanced at Yang Lin, "Go and try if you have the ability."

Yang Lin really refused to accept it. He rolled up his sleeves, showed off his thick biceps, and walked out arrogantly.

When Yang Miao saw Yang Lin say something, the little tiger punched him hard.

Yang Lin had an expression of indifference, but as soon as he turned his face away, he rubbed his arm vigorously, walked up to him, and said to Yang Miao while rubbing, "Your tiger's fist must have added attributes. I feel that the whole arm is numb now, and the lightning attribute , definitely right!"

"Play less games!" Yang Miao lowered her head and continued to read.

Yang Lin scratched his head, "I suddenly had an idea just now! What we are in now is a game world, you and I are both NPCs, your tiger and my uncle are the players!"

"..." Yang Miao shook her head when she heard the words, feeling that Yang Lin was completely hopeless.

If Yang Dongsheng were here at this time, he would definitely say, "Young man, you are already very close to the essence of the matter. Have you told anyone else about this guess? Only told Yang Miao, very good! Someone, pull it out and bury it!" "

The private plane landed at Shanghai Airport, and Director Li came to pick it up.

After getting on the bus, Director Li began to report on his work.

Liu Xinyu sent a message that the farms had preliminarily selected several locations, which were located in Ryazan, Kaluga, and Tula regions of Russia.

These are traditional agricultural states in Russia, which are relatively close to Moscow and not far from Ukraine, Europe's largest grain exporter at this time, and are very suitable for building farms.

"Remind him to be careful and protect his own safety!" Yang Dongsheng said.

Before Yang Dongsheng left Russia, that Oka Gorodovikov was still in their hands.

It is conceivable that Russia is not at ease with them at all!

Director Li continued to report that in terms of industry, the Siemens Berlin plant has completed the assembly of the first H-class gas turbine—SGT5-8000H gas turbine prototype, and will start testing this year.

According to the design, the simple cycle thermal efficiency of this gas turbine will reach more than 40%, and the combined cycle thermal efficiency will reach more than 60%.

When Yang Dongsheng heard this, he raised his head and said directly to the driver, "Go to Dongsheng Heavy Industry!"

He is now eager to know where the research on the batch of nickel-iron alloy left to Dongsheng Heavy Industry before going to Russia went.

When I arrived at Dongsheng Heavy Industry, I found out after asking that Vice President Wang had gone to the cemented carbide processing workshop.

The staff was about to call Vice President Wang, but Yang Dongsheng waved his hand, just in time for him to visit the workshop.

But when he arrived at the door of the workshop, Vice President Wang still led people and lined up to welcome him.

Compared with the workshops of most domestic heavy industry enterprises at this time, Dongsheng Heavy Industry's workshop is not at the same level of cleanliness.

In the workshop, a machine tool is processing high-pressure turbine blades.

Through the glass, you can see that the processing speed is much slower than before.

The harder the material to be machined, the lower the speed of the machine tool must be adjusted.

Fortunately, when Yang Dongsheng passed by, the entire processing had basically come to an end.

After a few minutes, the processed blades are removed.

Even Yang Dongsheng, a layman, could tell that the leaves were not in good condition.

Compared with the previous blades, this high-pressure turbine blade has no luster at all.

The chief mechanic didn't look at the blades first, but first checked the knives he had just used, shaking his head while looking at them.

Yang Dongsheng looked at it and said, "Since our nickel-iron alloy is somewhat harder than tungsten carbide, can we use this alloy to make knives?"

"I'm afraid not!" Vice President Wang shook his head. "Recently, we have done a series of experiments and found that this alloy not only expands when it exceeds the melting point, but also expands when cut. Even if it is cut with a water jet, it will actually expand. Someone even used a hammer The manganese knocked it out, and it swelled at best! I suspect that this nickel-iron alloy is in a metastable state at all!"

"Can't the graphitization furnace dispose of the expansion layer?" Yang Dongsheng asked.

"The graphitization furnace can indeed remove the expansion layer, but..." Vice President Wang shook his head, "Even if the same piece of material is used with the same cutting tool, the number and speed of cutting are different, and the thickness of the expansion layer is also different. According to our experiments during this period, it can be determined that the higher the melting point of the alloy, the higher the processing temperature, and the thicker the expansion layer."

Aeroengines and gas turbines are turbomachinery with high-speed blade rotation, which require extremely high precision blades!
According to the information they have, the high-pressure rotor of the F-22 aeroengine used by the F-119 can rotate at 16000 revolutions per minute, and the air flow rate is above 110 kilograms per second.

For this level of aero-engine blades, the profile accuracy is usually below 0.025 mm.

The nickel-iron alloy they use is denser than ordinary nickel-iron alloy, and the requirements for precision must be higher.

In addition to precision, there is also surface roughness.

The research results of the Lewis Research Center of NASA show that when the profile accuracy of the blade is about 0.025 mm, if the surface roughness Ra of the blade can be reduced from 3.1 microns to 0.51 microns, the efficiency of the engine will increase by about 5%.

Yang Dongsheng looked outside the factory building and said as he walked out, "Tell me what you think."

"Actually, we don't need materials with high performance!" Vice President Wang followed Yang Dongsheng, half a step behind, "The turboprop engine is most suitable for operation below Mach 0.6, and the large bypass ratio turbofan engine used in civil aviation airliners It is most suitable for operation below Mach 0.85. The small bypass ratio turbofan engine used for fighter jets is most suitable for operation below Mach 1.2. It is best to use a turbojet engine if it is higher. When it reaches Mach 3 or more, a scramjet engine must be used. Once it exceeds At this limit, all types of engines can only work for a short time, otherwise the blades will not be able to stand it.”

"Yeah!" Yang Dongsheng nodded.

王副总继续道，“F-119不开加力的中间推力是12吨，加力推力是18吨。两台F-119就足以推动F-22达到2.25马赫的最大速度，以及使用1.58马赫的速度持续飞行半个小时！我们国家的下一代战斗机，在起飞重量上应该也是跟F-22同一等级的飞机。”

"That's true!" Yang Dongsheng nodded.

Vice President Wang looked at Yang Dongsheng, "Now every time the temperature in front of the turbofan engine turbine increases by 100 degrees, the maximum thrust can be increased by nearly 20%. The temperature in front of the turbofan engine of the F-119 is 1700 degrees, and the intermediate thrust is 12 tons. For a turbofan engine For example, the temperature in front of the turbo is 1900 degrees. We plan to relax it and control the temperature in front of the turbo to about 2000 degrees. This also needs to consider the integration of turbojet technology and control the bypass ratio of the engine. Otherwise, even if the high-pressure turbine The blades can hold up, but the fan can't!"

(End of this chapter)