Tomorrow is 515, the anniversary of the www.biquge.info of Biqu Pavilion, the day with the most benefits. In addition to the gift bag and school bag, this time the 515 red envelope must be turned over, how can the red envelope not be robbed, set the alarm clock high~

For example, the thrust range of the CFM-56 engine starts from nine tons, and the maximum can reach 13 tons, and the thrust range spans a total of 4 tons in the middle, so now it is not too much of a problem to add two tons of thrust to the CG-2000, at least theoretically feasible.

However, Mr. Wen said that the span of this increase and retreat is relatively large, and the technical requirements are relatively high, and there is no reliable plan for the time being, which makes everyone feel a little helpless.

But fortunately, there are definitely a lot of technical bulls here, Mr. Liu works as the chief engineer of 624, and has developed the core machine of the push, starting from the aspects he is good at, it is not difficult to increase the push, and this is also a problem that can be solved by moving the core machine.

It is better to have an idea than not to have an idea, and Chief Engineer Liu stood up for the first time: "Since Chief Wen can't find a feasible plan for the time being, then I will stand in the perspective of the 624 Institute and publish the engine increase plan that can be based on the technology of our 624 Institute." ”

The research of the core machine is the place that can best reflect the level of research and development of a country's aero engine, and the deputy chief engineer of the Ivchenko Design Bureau finally raised the spirit, since he pressed this research institute, this should be the first time that he came into contact with the chief engineer of 624 to publish a technical plan, and now he can finally see the real level.

At this time, the chief engineer of MTU paid no less attention than anyone else, and this is the most important technical solution evaluation of the core engine in the aero engine. Previously, Southwest Science and Industry had not allowed MTU to access the core machine of CG-2000, but now it finally has a chance.

"Alter the core? That's a good solution. Previously, our CG-2000 engine core engine came from the mid-thrust core engine developed for military turbofan engines, due to the strict requirements of size and weight of military engines. The core aircraft of the director zhìcg-2000 is not completely suitable for civil aviation engine use, if there is a good plan, you can listen to it. ”

After finishing speaking, Yang Hui sat on the side and listened carefully to Chief Engineer Liu's plan design.

"Our plan is actually not too complicated, just the positioning of the core engine of the CG-2000 engine. On the basis of the original push core machine, the development of a core machine specially used for civil aviation passenger aircraft, so that we no longer have the limit on the number of compressor stages, the original 7.5 level high-pressure compressor design can be completely released, increasing the number of two-stage and three-stage compressor stages are no problem at all, and the high-temperature turbine can also be changed from one stage to two stages. This design is the core aircraft scheme commonly used in civil airliners. ”

Hearing this, I understood what Chief Engineer Liu meant, this is to divide the core machine of the push, military and civilian are no longer universal, and from then on, everyone will go their own way, and the new core machine developed on the basis of the original core machine will no longer have anything to do with the military.

I have to say that this is a good way to add to the CG-2000 under the current situation, if the new core machine can be developed, it should be similar to the core machine used on the V2500 engine. It will probably be a design scheme such as a nine-stage high-pressure compressor and a two-stage high-pressure turbine (V2500 is a ten-level high-pressure and two-stage low pressure), but the changes in this scheme are so big that even Yang Hui was stunned when he saw it.

What must be the situation with this thing? Ah, this core machine can be regarded as a complete redesign, okay? At most, it can be said that it is a great use of the core machine technology of some medium push core machines, if you insist on saying that there are any similarities between these two core machines, it is definitely bragging!

After the progression of the core machine has been changed. The volume, weight, and air flow must be changed, and the rotor support scheme and low-pressure compressor matching in the design of the whole machine cannot be the same as the original CG-2000 engine. Such an improvement plan could not be classified into the same series of engines of the CG-2000, so it was rejected by Yang Hui in his heart at the first time it was proposed.

"I think it's too big a change. Not only is the core machine almost redesigned, but even the whole machine must be redesigned, which is definitely too late in time, and it is also contrary to the original plan to improve on the basis of CG-2000, so as to reduce the design workload, reduce costs, and control the requirements of risks. ”

Seeing that the plan he had just proposed was denied, Chief Engineer Liu still couldn't hold back on his face, and opened his mouth to say something, but swallowed it back when it came to his mouth. Turning his head to look at Chief Master Wen sitting next to him, he didn't quite understand why he had to step on himself just now, didn't he know that it hurt?

Chief Master Wen didn't speak, but just used his fingers to draw a number from "12" in Chief Engineer Liu's hand, and then he understood.

Sit down and listen carefully to what Yang Hui said: "Since we have determined that we want to improve on the basis of CG-2000, then we must fully respect the original design scheme, and the core machine should be improved?" I think this is definitely there, but our improvements should be focused on the new combustion chamber design, the temperature increase of the high-temperature turbine, the cooling, etc. These improvements are not too big to solve the problem fundamentally, but they are also the most technically risky and safest solution. ”

When he heard that he wanted to concentrate the improvement of the core engine on the combustion chamber and the total turbine temperature, the director of the combustion chamber technology department of the 624 institute, who attended the meeting, was interested, and this kind of thing happened to his appetite.

Now the domestic short-ring combustion chamber technology has been conquered, which can be regarded as a gap of only about ten years with the international level, but in order to continue to further narrow the gap, this requires persistent investment in research and development.

There is no specific project as the traction, no matter how good the pre-research is, it is only a number on paper, and the real problems need to be exposed in actual use to further improve, and this is a rare opportunity.

Some little excited to introduce their own pre-research over the years: "The improvement plan of the combustion chamber is not a problem at all, we have pre-developed advanced technologies such as floating wall combustion chamber and zonal fuel supply, using these technologies we can ensure that the combustion chamber can withstand higher temperatures, convective impact, and significantly reduce the probability of engine parking in the air." ”

I didn't expect that the 624 place had unconsciously pre-researched the partition fuel supply technology, even the floating wall combustion chamber technology has been involved, both of these technologies are good things for military dual-use, not only civil aviation engines are needed, military aviation engines with this thing can also significantly improve performance, F100-PW-220 engine, Russia's F-119 engine are used after this technology, only to have the top three generations of turbofan engine performance.

The floating wall combustion chamber is a necessary technology to increase the gas temperature of the combustion chamber, without which the combustion chamber cannot provide a high enough gas temperature to make any sense even if the total temperature of the high-temperature turbine is high.

The zonal fuel supply technology can adjust the oil-gas ratio in the main combustion zone when the engine is slow, so as to achieve local oil-rich combustion, ensure the normal operation of the engine, and reduce the probability of air parking, and reducing the probability of air parking has always been a very important indicator for aero engines, and major aero engine manufacturers have been working hard for this.

ps.5.15 Pen Fun Pavilion www.biquge.info red envelope rain! Starting at 12 noon, grab a round every hour, and a large wave of 515 red envelopes depends on luck. You all go and grab it, and the www.biquge.info coins you grabbed continue to subscribe to my chapters! (To be continued.) )