The design of the high-pressure compressor is the project with the highest degree of autonomy in the entire core machine engineering, and there is no reference or copycat of external finished product technology at all, but the final design performance test is surprisingly good.

Turning over the introduction to the structural design of the high-pressure compressor is the data obtained by the compressor in the test in the past few months, although it is not too detailed, but the approximate performance of the compressor has a thorough data, and the most important sea level air flow data alone is enough to make Yang Hui laugh for more than three days.

THE AIR FLOW RATE OF THE ENTIRE HIGH-PRESSURE COMPRESSOR HAS REACHED A GRATIFYING RESULT OF 52.2KG/S (THE 60KG/S REQUIRED IN THE PREVIOUS CHAPTER IS A MISCALCULATION BY ME, AND THE CORE ENGINE THAT CAN REACH THAT LEVEL CAN DIRECTLY DEVELOP THE HIGH-THRUST ENGINE OF THE F110 LEVEL), WHAT DOES THIS DATA MEAN? It is no exaggeration to say that this core machine is already the best of all the third-generation twin-rotor push-engine high-pressure compressors.

The F404 and F414 in the United States are from the same core machine, and the air flow is only 47KG/S; The air flow of the M88 developed by France by stealing American technology is not as good as that of F404, and the air flow rate of the entire early M88 model is only 45KG/S. MAOZI's RD33 IS BETTER, USING A 9-STAGE IMPELLER, WHICH CONTROLS THE AIR FLOW OF THE CORE MACHINE AT 51.3KG/S.

NOW THERE IS A HIGH-PRESSURE COMPRESSOR AS HIGH AS 52.2KG/S, WHICH SHOWS THAT AT LEAST IN TERMS OF HIGH-PRESSURE COMPRESSOR PERFORMANCE, IT HAS NOW CAUGHT UP WITH THE WORLD LEVEL, AND WITH A BIG MAN LIKE WU LAO, IT CAN EVEN EXCEED THE WORLD LEVEL.

This is the power of technology pre-research, through the most basic technology bottom tackling, each technology does not need to be much higher than the international level. As long as you can exceed one point, it is considered progress. Only when each basic component has been improved, the final assembly of the whole will give the greatest surprise.

Engine technology in Western countries is better than that of the republics. It doesn't rely on which aspect is strong and cannot catch up, but really opens up the gap in the technology of the whole machine. It is also because people continue to invest in and pre-research all aspects of technology.

When the first generation of engines is finalized, the technical pre-research has begun to move to the next level, and the Republic reverses through the finished product, not to mention whether it can achieve the performance of the original products.

Just when you are reversing other people's technology, the pre-research of the next generation of technology has been almost completed, as long as there is a need to take out the pre-researched technology, when all kinds of small progress project technology are assembled into a whole, a huge technology generation gap will come out.

So, in all respects. Reverse engineering has almost no future in such complex industrial equipment, even if you learn someone else's technology through reverse engineering.

The technology you have spent a lot of effort to learn is only the stuff of a generation behind others, and if you really want to be a latecomer who is ready to catch up, you need to start from the foundation step by step.

Without the ability to upgrade technology from the foundation, it is impossible to say anything about catching up.

The reason why the current Southwest Science and Industry is willing to spend a huge amount of money to take over the pre-research project that even the country is unwilling to continue seems to be wronged, after all, it is a project that cannot see the obvious goal, and even what can be made in the end is unknown. Who wants to!

Southwest Science and Industry does not choose to imitate, reverse other people's aero engines, this is based on the consideration of consolidating the foundation of engine development, in order to make further progress, it is necessary to dispel the unrealistic idea of reverse engineering of the whole machine as soon as possible.

To say that it is an imitation of an advanced mid-thrust engine. Yang Hui has a plan, for example, the RD33 engine in the Soviet Union, which has been sold by the Soviet Union. It's difficult, but it's not impossible.

There is a clear reference. Southwest Science and Technology can point to it and say to the high-level: Look, this is a good engine. As long as the funds are in place, our Southwest Science and Industry can be imitated.

To be honest, the RD33 engine really does not have much technical content, the RD33 engine was originally a turbofan engine developed successfully in the late seventies, because the Soviet technology was not very good at that time.

The RD33 engine has very low requirements for the manufacturing process, and the reason why it can barely be used is because it has a fairly good structural design, good materials, and low requirements for the thrust-to-weight ratio to be qualified, and because the American F404 engine has a fear of heights, the eldest brother will not talk about the second brother.

These are all Yang Hui knows in his heart, naturally no matter where you look at it, you are not willing to imitate the RD33 engine, the current republic through independent research and development, introduction, got the Soviet Union, the British engine technology, with some good basic technology, naturally to learn from the advantages of many technologies, come up with a real republic bloodline engine.

With the continuous investment of funds, coupled with Yang Hui's willingness to spend some time, and with international authority in charge, it is natural that the high-pressure compressor of Xinzhongtui can be better than that of its predecessors born earlier.

The development of high-pressure compressors is gratifying, and it is definitely qualified, and the development of the combustion chamber in the three major components of the core machine is also carried out in 624 here.

Compared with the high-pressure compressor, led by a cow like Wu Lao, and the world's advanced achievements have been made, the development of the combustion chamber is bland, and the core engine of F404 continues to be deeply developed and thoroughly understood.

Although the combustion chamber technology is not more advanced than the short annular combustion chamber of the F404, it will not lag behind, at least it is more advanced than the annular combustion chamber of the turbofan 10, which is enough not to lag behind.

The entire combustion chamber is machined from alloys, and the fuel is sprayed and atomized through 18 double cone nozzles and 18 vortex cups to achieve smokeless combustion, which is a typical pneumatic nozzle design.

As for the most critical high-temperature turbine blade of the entire core machine, it also uses the DD3 single crystal technology researched by Beihang Materials, which does not mean that Beihang has fully realized the industrial large-scale manufacturing of blades.

The current monocrystalline blade is only in the cooperation of Southwest Science and Industry, can produce a high-temperature turbine used in the new core machine, as for the yield rate, this has to continue to work.

Because it is only the trial production stage of the core machine, the demand for high-temperature turbines is not too much, and in the two years of cooperation. Southwest Science and Industry and Beihang Materials Institute through various ways to improve the yield rate.

In the test of various methods, although the yield rate has not improved much. It has not yet met the requirements of Southwest Science and Industry, but there are always some finished products in the long-term trial production.

These finished products are used in addition to testing. There are more than 100 pieces of unused finished blades accumulated in two years, so they were sent to the 624 Institute to be installed on the core machine for core machine use.

These finished single-crystal high-temperature turbines are even more expensive than those manufactured under laboratory conditions, and they are a by-product of multiple trials of production methods to improve yield. This is not a lot of money for research to improve the yield rate, and the total number of coins is almost 60 million.

The cost of 60 million coins has come up with just 100 pieces of finished turbines, can this cost not be high? The cost of one piece is close to about 500,000 yuan, and when you think about it, you feel that your heart is dripping blood.

For this reason, the entire 624 Institute also cherishes this hard-won turbine blade and has been carefully cared for.

There are a total of five high-temperature turbine disks that are officially assembled, and two are used for turbine disk performance testing. The other two are used for the assembly of the core machine, and the remaining one is set aside for later use.

When Yang Hui saw the finished product of the entire core machine, he felt that this core machine was not easy to come by, the two core machines were displayed side by side on a special bench, and the steel casing was covered with metal

There is a luster.

From the front, the first thing you see is the support point of the entire high-pressure rotor, because the rotor works inside the casing, it naturally needs to be positioned in the center of the casing, which requires the rotor to be supported.

As the core machine, it is generally designed with two fulcrums. One is in front of the first stage impeller of the high-pressure compressor, and the other fulcrum is designed at the very rear of the high-temperature turbine.

Among the mainstream twin-rotor aero engines, the largest load-bearing point is definitely the fulcrum located in front of the high-pressure compressor, which not only has to bear the lateral support force. At the same time, it is also subject to radial engine partial thrust.

After careful study, I understood the design principle of this fulcrum, and made the entire support bar into a design similar to a stator ring. It not only plays a role in bearing force, but also rectifies the compressed air from the low-pressure fan.

That's a pretty good design. It can make the most effective use of every gram of weight, as for the core engine high temperature turbine at the rear point of the support design scheme. Yang Hui probably guessed something!

Now this core machine is the latest in the development of the three generations of the international mainstream, how can it be possible without a late-mover advantage!

Especially after the comparison of the F404 engine in kind, another design comparable to the adjustable stator of GM: the intermediate bearing fulcrum, must also be used.

Namely, the intermediate bearing, which is a design widely used in the second fulcrum after the high-temperature turbine of a twin-rotor engine, the inner ring of the fulcrum is sleeved on the low-pressure rotor spindle, and the outer ring is against the high-pressure turbine spindle.

This design was first seen in the F101 turbofan engine used in the B1 bomber, and the advantage is that it can reduce a load-bearing frame, as well as the corresponding oil chamber, oil supply and return device, etc. This design reduces a considerable part of the parts and weight, and also simplifies logistics maintenance and improves engine reliability.

This design was indeed very good, and it was widely sought after when it was introduced, and even the Soviets resisted the temptation to use this design on the Rd33 engine.

The only drawback is that this thing has higher requirements for the design of the two rotors, after all, the inner and outer rings of this thing are fixed on the spindle of the rotor at different speeds, and once one of the rotors vibrates too much, the bearing will be damaged.

Bearing damage will lead to the failure of the support of the rear point of the core machine, which will lead to the lack of sufficient support points for the core engine in high-speed operation, and the engine will naturally ......

From the front of the core machine, he slowly detoured to the rear, carefully observed the No. 2 support point of the core machine, and the information obtained was as Yang Hui guessed at the beginning, thinking of the special characteristics of the intermediary bearing, Yang Hui let out a small 'complaint'.

"Is this No. 2 support point designed with an intermediate bearing? This design scheme is indeed beneficial to the design of the core engine and is the best choice, but this is a big problem for the overall design of the engine! ”

This kind of hug sounds more like an affirmation, and the words are more about the recognition of the design of the intermediary bearing, which makes everyone sound very satisfied, and it is also a compliment to the entire core machine design team.

With the 624 Institute of the same generation to participate in the core machine full power test also has Mr. Wen, he also knows what it means to use the intermediate bearing design of the core machine support point, but Mr. Wen is full of confidence in this.

"The intermediate bearing design scheme is good, this design scheme not only optimizes the core machine structure, but also helps us to design the engine behind the machine, which will greatly reduce the complexity of the whole machine design, this is one less rotor support point!"

As for the increase in the requirements of the new engine for the stability of the low-pressure rotor after the use of the intermediary bearing design, Mr. Wen has his own plan, in order to meet the thrust requirements of the new engine proposed by Southwest Science and Industry, the low-pressure compressor also has a special design scheme.

Thinking of the quality and length margin of the whole machine after the use of intermediary bearings, Mr. Wen felt that he still had a lot of articles to do, perhaps the design scheme of the low-voltage fan could be changed again, anyway, so much margin was freed up.

Yang Hui didn't know Chief Wen's plans in Xinli, including Director Bai, Chief Engineer Liu, and Wu Lao, but this did not prevent everyone from applauding Chief Wen's self-confidence in their hearts.

Chief Engineer Liu is the head of the 624 Institute, but also the general person in charge of the entire core project, the intermediary bearing design is his decision, and now the chief engineer in charge of the design of the whole machine is satisfied with the design of the core machine, that's it.

"The intermediate bearing design is just one aspect of the new technology in our core machine design, and in addition to the intermediate bearing design, we also use the arc end coupling design, which is a technique we learned from the British."

As he spoke, he led everyone to the front of the quarter-entity cross-sectional model, pointing to the gear coupling of the high-pressure compressor and proudly explaining that this thing is a highlight of the core machine technology.

The arc face gear coupling is a commonly used method in the design of European aero engines, and its working surface is composed of two gears, one concave and one convex, which causes the surface of this gear to be very troublesome to manufacture, and needs to be manufactured by a special Gleason gear grinder.

This special equipment is an important reason for restricting the popularization of this technology, but there is no such problem in the current republic, because the introduction of Spey 202 engine is also designed with arc end gear coupling, naturally the republic also has a Gleason grinding machine that manufactures this special gear.

This is the reason why the 624 Institute dared to adopt this unique design of European blood aviation launch, who let us have this technology! Now that you have it, you have to make effective use of it, otherwise it will be an absolute tyrannical thing.

You must know that there are too many benefits of this kind of arc end face gear coupling, and the biggest point is that people can achieve automatic centering and transmit super torque, and it is quite easy to disassemble and assemble.

The most important of these advantages is the automatic centering function, which is not a simple automatic centering function, it can not only achieve automatic centering at room temperature, but also can achieve perfect automatic centering between the compressor and the spindle rotating at high speed in a high temperature environment.

This is very interesting, regardless of the ambient or high temperature conditions can achieve automatic centering, which means that the connection between the compressor and the spindle can be tighter, and the vibration of the entire rotor after operation can also be greatly reduced.

This design can completely compensate for the weaknesses of the intermediate bearing design, so that the intermediate bearing design can be used with confidence and boldness. Coupled with the other advantages of the arc end face coupling, the core machine can't use this design, it is really necessary! (To be continued.) )