Since the 624 side has pre-researched the new combustion chamber structure, and it does look attractive, then this improvement plan should be the most beneficial for Southwest Science and Industry.

The design of the inactive compressor means that after the improvement of the core engine of the middle push, the results will not be limited to the subsequent improvement series of CG-2000, and the use of this thing for the improved turbofan 12 engine supporting the J-18 is the inevitable result.

Just taking this into account, it is indispensable to improve the combustion chamber of the core machine this time, and this path must be taken no matter what point it is.

"Okay, since the 624 Institute has pre-researched these two technologies, then it is definitely necessary to improve our core engine, floating wall combustion chamber and zonal fuel supply are the necessary technologies for advanced aero engines, what does Chief Engineer Liu think?"

Just now, General Engineer Liu's plan was directly denied, but now the 624 Institute has proposed a new plan, and it is very feasible, so it is necessary to seek the opinion of Chief Engineer Liu to carry out research in this regard.

Seeing that the 624 Institute still won the core engine upgrade and improvement project in the CG-2000 engine improvement model, it must be supported, as the chief engineer of the institute, it clearly knows how much benefit the improvement of the combustion chamber will bring.

He smiled and hurriedly agreed: "This is no problem at all, the development of a new generation of combustion chambers is also a must, and 624 has all the ability and confidence to complete the project." ”

After determining the improvement route of the combustion chamber, Chief Engineer Wen and the Chief Engineer of MTU all agreed with this, but the deputy chief engineer of the Ivchenko Design Bureau thought of something, during this time in the CG-2000 project team to assist in the testing and follow-up improvement of the project, some of the technical performance of this engine is not 100% clear, but 50% of the technical performance is still known. This includes some semi-public technical numbers of the core machine.

"If you want to improve the combustion chamber, in the end it is nothing more than to improve the combustion efficiency and gas temperature, but have you ever thought about whether the high-temperature turbine of the core engine can withstand the higher gas temperature after the gas turbine temperature is increased? If this is not a problem. With all due respect, all of you here are saying that "

In the end, the problem is boiled down to the total temperature of the high-temperature turbine. If there is no such technology, I am afraid that the improvement of the combustion chamber will not bring much improvement to the core machine, which is really a headache.

In all fairness, the total temperature before the turbine of the CG-2000 reaches the current 1400 degrees Celsius is already very good, and the two engines of the American emperor's F100 early model and F110 are also at this level, but it is still the same sentence: on the road of pursuing a higher total temperature before the turbine, this is endless.

After reaching 1400, you have to think of 1500 or even break through to the level of 1600 and 1700, if you can reach 1700 degrees Celsius. Then it can be directly installed on the next generation of aero engines, and the total temperature before the turbine of the F119 is 1700 degrees Celsius.

Of course, it is only the current CG-2000 engine 1400 degrees Celsius level, it is also the southwest science and industry to use the strength to eat, the use of single crystal turbine blades, perfect convection-impact cooling technology, to do this step is almost the limit of the country.

And to increase the total temperature before the turbine, it is necessary to think of various other ways: "This makes sense, continue to improve the core machine of the middle push." We have to increase the total pre-turbine temperature of the engine, which still depends on the 624 all have no specific technical solutions? ”

Heard and assigned to speak. Chief Engineer Liu was also very speechless, is it so easy to increase the total temperature before the turbine? Without the state's supporting projects, this is completely impossible to be good!

"Don't expect too much, from the design point of view, the current push core machine has used the world's most advanced forced cooling design scheme, if we want to continue to increase the total temperature, this must be in the manufacture of blade materials to find a way. The development of high-temperature resistant coatings for blades is a necessary way, and we also need to make breakthroughs in the manufacturing process of turbine discs, so the powder metallurgy process must be put on the agenda. ”

Hearing Chief Engineer Liu say that he wanted to develop powder metallurgy turbine disks, Rao is deputy chief engineer of the Ivchenko Design Bureau was also excited, what is this? This is a technology that the Soviet Union could not handle or not. Now it is not surprising to hear that powder metallurgy technology is going to be developed.

Shaking his head vigorously, he wondered what kind of black technology this was doing, and was he preparing to surpass the Soviet Union's aero-engine base industry in one fell swoop?

To be honest, these two points mentioned by Chief Engineer Liu are Yang Hui's biggest headaches now.

First of all, the high-temperature coating supporting the blade is really not available in the Republic, there is no research in this area in China before, and it is also after the Southwest Science and Industry Co., Ltd. pushes the core machine on the horse, and the company allocates some funds every year to study this aspect, but this kind of catching up with the world's most advanced from scratch is definitely out of touch with the current strict demand, and the road of self-developed high-temperature coating is still very long

If the high-temperature coating can still have a glimmer of light, then just said that the supporting manufacturing performance of the turbine disc is more excellent, it is really only a dry look, carefully speaking, powder metallurgy turbine disc is actually not a very broad and profound technology, as long as you can have supporting equipment, and at the same time with the appropriate mold opening technology: large deformation extrusion billet.

With the above technology, it is relatively easy to overcome the technical bottleneck of powder metallurgy, but the problem is that to develop this technology, the basic supporting equipment needs to be used: 10,000 tons of metal vertical extruder.

With a vertical extruder can we say that we can develop heavy-duty powder metallurgy technology, without this kind of thing, we can't even carry out the most basic trial production, and how to study the mold opening technology after the extrusion is completed? The last republic only developed and manufactured such equipment after 2010, and now

This kind of equipment is not even good in the Soviet Union, and only the United States has this kind of large-scale equipment in order to match the powder metallurgy turbine disk of the F119 engine.

Even if you Yang Hui are indeed good enough, you can find all kinds of Taobao after the collapse of the Soviet Union, but what the Soviet Union didn't have, where do you go to Tao? Therefore, now the whole talent will be so pessimistic, to conquer powder metallurgy technology in just a few years, this is really unrealistic.

A simple calculation will show that it takes at least three to five years to design and manufacture supporting 10,000 tons of vertical extrusion equipment, and then the research and development of powder metallurgy technology, which is at least three to five years, and then the finished turbine disc is equipped with blades and assembled into a high-temperature turbine for testing, and finally the development and testing of the core machine must take at least one or two years.

This means that even from now on, the country will have sufficient funds and various resources, and there will be no major technical problems in the middle. In this case, if you want to put the core machine of powder metallurgy turbine disc into practical use, you will not even think about it after 2000.

Waving his hand, indicating that this thing is really incapable now: "Powder metallurgy turbine disc is definitely not good, we do not have this technology, and we do not have time to wait for this set of technology to complete the development, now we can only develop in depth on the original hot isostatic pressing technology, and after digging deep into the potential, it should also be able to meet the needs of use." ”

(To be continued.) )