Return to 2000: Captain of the Great Powers

Chapter 426 "Origin" series engines!

"Can't make it? Can't make it even if there are blueprints?" Xu Cang finds it unbelievable, research and development is very difficult, and copying is not enough?

Perhaps Xu Cang's unbelievable tone hurt Lin Ming's self-esteem. After all, Xu Cang even produced a complete set of technical drawings of the three rotors, and he couldn't even copy them.

But this is the fact, AVIC just can't reproduce it in a short time.

"Xu Cang, the complexity of the three-rotor engine is far beyond our imagination. The technical difficulty of the two-rotor engine is close to our limit, and the complexity of the three-rotor engine is several times that of the two-rotor engine. The prototype is estimated to be five years away."

"Five years?" Xu Cang was very surprised: "Materials that can withstand high temperatures?"

"No, it's mainly a matter of the precision of the manufacturing process. Some processes are even blank for us, such as the air layer heat resistance technology of turbine blades."

"The air layer blocks heat?" This Xu Cang really knows a little bit.

Turbine blades in aero-engines need to withstand extremely high temperatures. Even if high-temperature alloys are used, the heat resistance is still not achieved in many cases. At this time, special treatment for turbine blades is required.

One method is to hollow out the turbine blades, and the airflow will escape from the small holes of the turbine blades, thereby wrapping the entire turbine blades, which has an effect similar to heat resistance.

This is a very delicate design, how to drill holes on the turbine blades, where to drill holes, and how to ensure the strength of the blades after drilling. After all, while bearing high temperatures, turbine blades also have to withstand high pressure.

And most importantly, how to ensure that the airflow after drilling can accurately wrap the entire blade?

Every problem needs AVIC to solve.

Rolls-Royce did provide a full set of technologies related to the three-rotor, but it does not mean that they will teach them all the technologies related to the engine.

For example, AVIC is now at the level of elementary school students, and aeroengines are a high-level math problem for undergraduates.Luo Luo followed the agreement and wrote the solution of this problem clearly, but even if there is a solution to the university-level problem, elementary school students can't understand it.

However, Luo Luo has no obligation, and it is impossible to help AVIC to complete the courses of junior high school, high school and university.How to improve yourself to understand this solution is now a problem that AVIC needs to face.

The study time given by Lin Ming was...five years.

This gap is too big, it is really the difference between elementary school and university.

Xu Cang fell silent for a while. He was not a technical professional and seemed to take some things for granted. He thought that with a complete set of drawings, everything would be possible. Now it seems that the gap in hard power is still a bit too big.

However, although Xu Cang was a little disappointed, it was acceptable.

Aeroengines are not an industrial essence brought up by marketing, but a real jewel in the crown.

According to the number of rotors, aero-engines are divided into single-rotor, double-rotor and three-rotor.Today's mainstream aero engines are all dual-rotor, which already represents the pinnacle of human industry. How high is the technical level of a three-rotor?
It’s no wonder that Rolls-Royce went bankrupt in order to develop the three-rotor engine RB211.If it hadn't been for the British government's intervention, Luoluo would have been completely cold by now.

Why is Xu Cang so obsessed with the three rotors?This involves the problem of the operating efficiency of the engine.

As we all know, the turbojet engine is powerful, but it really can't stand it when it burns oil, like a bottomless pit.Relatively speaking, the economy of turbofan engines is much better, especially for commercially operated civil aviation engines.

Due to material and process limitations, the main way to improve engine performance can only be to increase the bypass ratio. Generally speaking, the outermost fan is made as big as possible.

However, this causes a very direct problem, that is, at the same speed, as the diameter of the fan increases, the speed of the blade tip will become faster and faster. After reaching the speed of sound, a blade tip shock wave will be generated, which will decrease instead. engine performance.

How can the fan diameter be increased without increasing the blade tip speed?
Then just reduce the fan speed.

However, in the dual-rotor design, the fan, low-pressure compressor and low-pressure turbine are connected by a shaft.

Contrary to the requirement that the fan speed should be as low as possible, the low-pressure turbine should be as fast as possible.Of course, it is a superficial theory that the low-pressure turbine requires that the speed be as fast as possible, because it needs to be judged in combination with the thrust of the engine, and the content is extremely complicated, but most of the time it conforms to this simple statement

The low-pressure fan on one shaft has diametrically opposite speed requirements to the low-pressure turbine. Isn't this a deadlock?
In order to solve this problem, two solutions were born.

One of them is the three-rotor technology!
Since the low-pressure fan and the low-pressure turbine have different speed requirements, a separate rotor is installed for the low-pressure fan to drive the fan independently.

In this way, the low-pressure fan, low-pressure turbine and high-pressure turbine are independent and can all run at the most suitable speed.

At first glance, this is a rather idealized design.

However, the dual-rotor technology is already beyond the reach of many countries, and the three-rotor technology is even more like a dream, and I dare not even think about it.

Even the two giants of General Motors and Pratt & Whitney are discouraged from three-rotor technology.

Yes, the three-rotor technology is so hard-core.

So far, only Russia and Rolls-Royce, inherited from the former Soviet Union, have three-rotor technology, which is the only rarity in the world.

So rare that AVIC couldn't even understand the answer.

Xu Cang glanced at the employees of the jewelry store.Perhaps it was because Xu Cang's clothes were ordinary, and the employees inside thought that Xu Cang just came here to take a look. Compared with those elegant people who followed the explanation, Xu Cang's treatment was indeed a bit colder.

However, this is just right, otherwise Xu Cang would have to avoid it for a while.

He paused: "What about the planetary gear technology, have you demonstrated it?"

Planetary gear is the technology that Xu Cang has been wanting to obtain from Pratt & Whitney.Pratt & Whitney felt that the three rotors were too complicated, so a transmission accessory box was installed between the low-pressure fan and the low-pressure turbine. This is somewhat similar to the gearbox in a car, but the difficulty of the process is not at the same level.

Although Xu Cang hadn't obtained Pratt & Whitney's planetary gear technology, he told Lin Ming about this idea, and Lin Ming asked the following people to demonstrate it.

If the three rotors are temporarily unavailable, planetary gear technology is also an acceptable way.

As a result, Lin Ming's answer also disappointed Xu Cang.

"The concept of engine speed change existed in the 60s. Installing a speed change accessory box between the low-pressure fan and the low-pressure turbine is indeed much simpler than the three-rotor technology. I also believe that Pratt & Whitney already has a very mature technology system. "Yes, but the key to the problem lies in the accessory gearbox." Lin Ming said quietly: "Even if the transmission efficiency can reach 90.00%, just one percent of the energy dissipated can form a huge amount of heat, thereby damaging the accessory. Gearbox."

The energy loss in the transmission process, resulting in heat accumulation is an unavoidable problem for the engine gearbox.

There is no way, the output power of the engine is too large, and a slight energy loss will accumulate a lot of heat.Moreover, in fact, there is basically no gearbox equipment that can achieve a transmission efficiency of 90.00%.

"We learned that in the 90s, Pratt & Whitney carried out the research and development of engine transmission, which was attached to the ADP project in the United States. Later, the ADP project in the United States was aborted, and Pratt & Whitney continued to invest. In theory, Pratt & Whitney may have matured, but in They don’t seem to have a good way to deal with the problem of heat accumulation.” Lin Ming said: “Perhaps, in order to achieve the results they want, the transmission must have an extremely sophisticated lubricating oil monitoring system. However, as far as I know , In fact, no institution or enterprise has such a capability. Perhaps, this is also the core problem that Pratt & Whitney has not been able to make a major breakthrough in variable speed engines."

"Once the heat accumulation problem cannot be dealt with, the accessory gearbox will undergo slight deformation due to excessive temperature. As long as the gear deforms, it will reduce the transmission efficiency of the gear, resulting in more energy loss and accumulation of more heat. A vicious cycle, and eventually the gearbox is damaged." Lin Ming continued: "Once the gearbox as a transmission is damaged, the engine will have uncontrollable high vibration values."

Xu Cang's eyelids drooped and his face was gloomy: "Yes, the information Pratt & Whitney gave me did reflect that there were many high vibration values ​​in the ground test of PW8000."

Pratt & Whitney gave Xu Cang the information in order to let Xu Cang know the situation of the PW8000 test machine in advance.However, in fact, the information provided by Pratt & Whitney has been beautified, and the real engine vibration problem is more serious.

It can only be said that AVIC is not without merit. It still has something. Possible problems with the PW8000 can be deduced only through theoretical demonstration.

"Transmission gearbox..." Xu Cang's expression was not very good. Unexpectedly, he had gone through so much hard work and laid out so many plans to obtain the three-rotor technology and the planetary gear technology that was about to be obtained. Jing Zhongyue.

One is too complicated, it will take several years to understand it thoroughly, and the other is more thorough, there is no theory, and the real thing can't be made at all.

Actually, there is one thing Xu Cang hasn't said yet.He initially planned to combine three-rotor technology and planetary gear technology, which is actually a bit similar to Rolls-Royce's Ultrara Fan technology.

However, even after 20 years, Rolls-Royce's super fan technology has still not been successfully commercialized.Part of the reason is that Rolls-Royce did not study the engine transmission in depth and spent a lot of time solving the transmission problem.

But even so, 20 years is indeed too long, which shows how difficult it is to integrate the two technologies.

After 20 years, when the super fan technology is not commercially available, the industry still regards this technology as a new revolution of the engine
The.

Although Luo Luo already has the concept of a super fan, he also agrees to share the related technology with Xu Cang.However, Xu Cang is still not optimistic about Luo Luo's progress, he can't wait for more than [-] years.

Therefore, Xu Cang wanted to use the two mature technologies of three rotors and planetary gears to start the research and development of super fans ahead of schedule.

Xu Cang wanted to grab it with both hands, but both hands were hard, but one couldn't hold it, and the other was nothing at all.

"Xu Cang, what do you say, now?" Lin Ming asked.

The reality gap made Lin Ming himself a little less confident.

"What should I do?" Xu Cang said: "Three-rotor technology is difficult, but at least there is hope, so let's focus on the three-rotor first. As for the planetary gear... Forget it, I don't think there is any need to pin my hopes on it for the time being."

In fact, at this time, Xu Cang didn't want to participate in Pratt & Whitney's engine flight test.The crux of the problem is not Pratt & Whitney, but the accessory gearbox.

Pratt & Whitney will never have success with variable speed engines until the issue of accessory gearboxes is fixed.

However, in Xu Cang's memory, before his rebirth, Pratt & Whitney solved the problem of the accessory gearbox, and a variable-speed engine was put into commercial use. Among them, Japan's self-developed MRJ aircraft is planning to install this engine.

However, after the abortion of the MRJ aircraft project, there was a lot of trouble.Because at that time, many people in the country still believed that Japan’s industrial capabilities were very strong, and self-developed aircraft should not be a problem. When the MRJ project was first launched, it was also very popular, but unexpectedly it ended up anticlimactic.

It was because of this incident that Xu Cang noticed that Pratt & Whitney had overcome the technical difficulties of the variable speed transmitter.It's just that Pratt & Whitney's variable-speed engine got off to a bad start. Before MRJ got its big deal, Japan released Pratt & Whitney's pigeons first.

The failure of MRJ made Pratt & Whitney's variable-speed engine project quite embarrassing.As for whether the latter type of engine has shown its true strength, or is it just an embroidered pillow that is not useful, it is unknown, because Xu Cang was reborn not long after.

Even at this moment, Xu Cang still firmly believes that the variable speed engine is the right direction.However, the current situation is a bit embarrassing.It seems useless for him to cooperate with Pratt & Whitney. Pratt & Whitney cannot solve the problem of transmission gearboxes by itself, and Pratt & Whitney itself is not good at the technical process of transmission gearboxes.

Xu Cang guessed that some other company should have solved the problem of the engine transmission gearbox, thus completing the last piece of the puzzle of Pratt & Whitney planetary gear technology, and then there was a breakthrough in the transmission engine.

There is a high probability that co-author Puhui is also waiting for "good Samaritans"!

What Xu Cang thought was that he played around between Pratt & Whitney and Stock Palm, taking their planetary gear technology into his pocket.

In fact, Pratt & Whitney theoretical technology Zenith Star, once it reaches the stage of actual manufacturing, focuses on a hand-out party.

Lin Ming's attitude was much more modest than Xu Cang's. A three-rotor really took away any pride that Lin Ming had, and some of them just rushed to catch up humbly.

"Xu Cang, just researching the three-rotor technology will probably consume all the power of our engine, but it is worth it." Lin Ming said: "With this drawing alone, you occupy 50.00% of the company's shares. You You don’t have to pay for anything, whether it’s land, building factories, or providing personnel, we’ll do it all. The question now is, do you have a factory site you like?”

To be honest, Lin Ming was so generous that Xu Cang felt a little embarrassed.

I can get more than half of the shares of an engine company without paying anything except the blueprints. It can only be said that AVIC still has a pattern.

As long as it can fill the gap in the aero engine, this little money is nothing.

In the Chinese market alone, the future profits will be more than this.

Moreover, once the three-rotor technology is fully grasped and the finished product is produced, it will become a world-class industry, and export sales can really be counted on.

If you want to earn, earn foreign money!
"Boss Lin, the location of the factory is up to you to decide."

Xu Cang didn't make any demands. In fact, this was also a concession.Now there is a complete set of blueprints for the three-rotor. As long as you throw money into it, you will definitely reap results.Many places are willing to introduce such high-tech enterprises that are designated to bear fruit.

Not only can it provide a huge amount of tax revenue, but it can also provide a number of high-paying jobs, and it may also form an agglomeration effect, forming more high-tech enterprises around.

In order to allow Xu Cang to settle the engine maintenance factory in Rongfu, the General Administration regarded it as one of the conditions for Xu Cang to obtain priority at Rongfu Airport.

Compared with engine maintenance engineering, the value of engine research and development companies is much higher.

Although Xu Cang is extremely smart, he is still inferior to Lin Ming in some social aspects.This kind of thing can only be exchanged for the greatest benefit in the hands of Lin Ming. He is now the major shareholder of the engine research and development company. If the company is good, he will naturally benefit the most.

Lin Ming did not refuse: "Okay, you can trust me, I will take care of this matter, you can just be a shopkeeper. However, there is something that must be done by you. You need to confirm the name of this engine, this matter you Don't say no."

Xu Cang pondered for a moment, then suddenly said: "Origin! This engine and its derivative models belong to the Origin series."

(End of this chapter)