At the same time as the development of the new generation of military push, the official letter from the high-level science and technology commission of the imperial capital was also sent to the southwest science and industry at the right time, and the technical requirements of the new generation of the push are just in line with the current technical level of the southwest science and industry.

In this way, the research and development team of the military medium push project began to design the technical framework of the general structure of the new generation of medium push, and the research and development team with high morale has some flavor that is unique to me.

The aero engine development project of Southwest Science and Industry is not only a new generation of military push, but also the CG2000 civil engine based on the same core engine design.

Thanks to the fact that the entire CG2000 project was established two or three years earlier, the development of the CG2000 engine subsystem has been completed, and even the most critical gear transmission system has been completed with quality and quantity.

The first batch of kits from MTU was also flown directly from Europe to the Republic, and a total of five sets of parts have entered the warehouse of Southwest Science and Industry.

In order not to affect the normal production order of the Liyang plant, the CG2000 engine manufacturing and assembly task was handed over to the rapid response center of the second institute.

The fast reaction center is dedicated to the manufacture of engine parts and the assembly of the whole machine of this new model, and it only took ten days.

The CG2000 engine was built up and installed with components manufactured by Southwest Science and Industry and MTU, and the five engines were launched into the assembly workshop successively.

As the chief engineer of the engine, Mr. Wen also paid attention to the final assembly and manufacturing of the engine throughout the whole process, and when the engine came out in red and green, everyone was boiling.

The MPC-75 powertrain from Xifei and MBB whispered a few words to each other, followed by various fingers.

"This is exactly what a turbofan engine should look like. Just by looking at the fan blades, it is obvious that this is a wide-chord blade design. ”

Although the one who came from the west flew here was to design the aircraft. But the bad guy is also dealing with the power system, whether an engine is good or not. You can also see one or two from the appearance.

From the outside, the main thing is the wide-string fan design, after all, this thing was absolutely high-tech in the 80s.

Rolls-Royce's RB211 was the first to put this technology into practical use, and the other two major aero engine giants in the 80s did not actually apply this technology to the new generation of engines, which shows the advanced technology.

This technology is designed to effectively reduce the probability of foreign matter inhalation by the engine, and under the same efficiency requirements, the number of blades can be reduced by up to one-third compared with the narrow chord shoulder blades, resulting in a reduction in the weight of the entire fan and an increase in rotor life.

Given the special gearing design of the CG200 engine. The fan and the low-pressure compressor are not directly connected to each other by a single shaft.

The addition of wide chord fan blades to the rotor life becomes an increase in the life of the traditional system of the CG2000 engine gear, which is why the gear transmission system of the CG2000 engine has a higher life.

As for why the little MTU has this technology, it is necessary to talk about the relationship between MTU and Rolls-Royce, in 83

At that time, MTU, Rolls-Royce, Pratt & Whitney, Fiat, and Nippon Aero Engines worked together to develop a new engine V2500 to prepare for the CFM56.

This engine is the proud use of Rolls-Royce's unique technology: wide-chord fan blades. At this time, why MTU has wide-chord fan blade technology does not seem to be so difficult to explain!

Also a member of the MPC-75 powertrain team, MBB is very satisfied with this CG2000 engine.

"Hmm. It is indeed very good, it was a very far-sighted decision for us to leave this engine at that time, just the design of the wide-chord fan can be excellent CF-34-3 engine too much, I think the buyers who choose this engine will definitely occupy the majority in the future. ”

While the fan blade design was still being discussed. Scientists from MTU took a few steps forward and gathered around the engines.

MTU has developed most of the cold-end components except the core machine, and the current assembly test of the whole machine must still involve MTU. This will be of great help in troubleshooting after problems occur in the whole machine test in the future.

The MTU side would like to take a closer look at the design of the core machine in this engine, but now the core machine is already installed in the engine. I could only look at the external control part of the engine.

After seeing the engine control system, MTU shook his head helplessly. If this engine is advanced enough, the only thing that is incompatible with these advanced technologies is the control system of this engine.

Although MTU does not have the ability and experience to develop engine control systems, it does not prevent MTU from having a critical eye and is very dissatisfied with the mechanical and hydraulic control system used in the CG2000.

"The mechanical control system of this engine is still a little too backward, and it would be best if you could use a digital control system, which may be the biggest disadvantage of this engine."

Hearing MTU's various complaints, Yang Hui was also a little helpless, this MTU was obviously a little enchanted, and now it is advanced for the sake of being advanced.

To say that this digital full-authority control technology, if it can be used, it is naturally the best, but this technology Southwest Science and Industry, MTU can not be taken out in a short time.

Why is this so? This is the status of this new engine control system, the digital full authority control system in the aero engine is to the engine, what the fly-by-wire flight control is to the aircraft.

This technology is definitely a world-class problem now, not to mention MTU, even Southwest Science and Industry does not dare to say that it can be quickly taken out, and naturally it is absolutely impossible to hastily use this new technology in the control of the engine.

If there is a problem with other parts of the engine, it may be possible to save it from a major problem, but if the control system is unreliable, it is definitely a fatal problem, and in this critical technology, it is safer to use a backward mechanical control system.

Take a simple example: the reason why the Taihang engine in the previous plane is still unreliable for many years after finalization has a considerable relationship with the engine control system. At that time, the core engine of Taihang engine was copied from the CFM56 engine, and there were few problems in general, and it was the engine control system that really made the Taihang engine frequently fail.

The mechanical part of the engine may be copied in various ways, but how do you crack the digital control system? The digital control system of the F110 engine of the American Emperor is directly closed, and even if you reverse the technology, you can't take out the data in the chip.

As a result, the early model of the Taihang engine on the previous surface hit the idea of the 31F engine introduced at the end of the 90s, and after a hasty study of the control system of the 31F engine, it was used in Taihang......

The final result is naturally needless to say, how can the huge difference between the American engine and the Soviet engine be the same control system.

After paying enough tuition, I learned to honestly test a large amount of oil burning on the engine, take out the working data of the engine under various working conditions, and then redesign the new control system.

Only then did the official report of Taihang Engine finalize, and after years of dormancy, it was not only used on the J-11, but also began to try to install and test on the No. 10 project.

This shows the importance of the engine control system to an engine, and the military engine pursues a high thrust-to-weight ratio and fast and accurate response, so it can't wait to use the digital control system.

However, in the current civil aviation engine, the thrust-to-weight ratio is not important, and safety and reliability are placed in a very important position, after all, this is something to be used to carry people.

Therefore, after careful consideration by Southwest Science and Industry, the engine control system was selected as a backward, cumbersome, but somewhat confident digital control system. (To be continued.) )