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The way to increase the power of an aero engine is simple, that is, to increase the temperature of the gas that drives the turbine to rotate. But in this way, neither the combustion chamber nor the turbine blades can withstand the high temperature burning, and the result is either burned or blown up.

The gas turbine power unit made by the Jet Power Office of the Ascendas Plant is currently stuck here, although Qian Qiang, Yan Tiancheng and others have copied it bit by bit according to Hamilton's T-62T gas turbine power unit.

Even if the size of each part is exactly the same as the original sample, once the imitation product is on the test bench, the longest time is less than 40 hours.

The original T-62T gas turbine power unit can easily run for three to four hundred hours.

The reason why the gap is so huge is that there is no other reason than the difference in the level of metallurgy between the two countries. There is no way. The United States is also a superpower and the world's largest industrial country. Because of this, the United States is the only one in the world in the field of basic metallurgy.

Not to mention anything else, just talk about the most basic aviation aluminum alloy. The United States can be lighter and more compact, but it is difficult to achieve this in China. In the final analysis, the basic industry of metallurgy is not as good as others.

As for the metallurgical process of metal materials on aero engines, it is even worse than that of the United States. Take the T-62T gas turbine power unit imitated by Ascendas Plant for example. Hamilton began research and development in the 1950s and completed the finalization in the 1960s. More than twenty years of history.

But people had already used powder metal metallurgy at that time, which made the engine parts more heat-resistant and doubled the service life.

On the other hand, in China, powder metal metallurgy is not unavailable, but its application range is not extensive. It is only used in partial engine improvement or new machine trial production. It is not that it does not want to be used on a large scale.

The main reason is that the domestic powder metal technology is too rough to carry out large-scale industrial production, so limited resources can only be concentrated on a few urgently needed domestic cutting-edge projects.

This has resulted in many aero-engine factories always using the old craftsmanship and technology provided by the Soviet Union in the 1950s and 1960s. The Yonghong factory is the most typical example. The equipment in the factory has not changed for decades. The process is not without research, but it is a pity that the equipment in the factory cannot meet the requirements of the new process and can only stay on paper.

The same is true for the Ascendas plant, even inferior to the Yonghong Plant in some aspects. After all, the Yonghong Plant also has a set of special equipment for the production of aero engines. The gas turbine unit of the Ascendas Plant is still processed by various workshops.

As for materials, the first-class materials with low output and several key trial-produced models are not enough. Naturally, they cannot be supplied to the Ascendas plant. Therefore, they can only use some mainstream domestic aero engine alloy materials at this stage.

In this way, the quality gap between the two has been opened up. Coupled with the lack of experience and processing in the Ascendas plant, it is not enough for the test run to fail repeatedly.

Fortunately, solving the problem of heat resistance of aero-engine components is not only the way of materials, but also a very effective way to solve the problem of high-quality cooling technology.

This is just like our military in the war years. The lack of equipment will give play to its tactical advantages. Ascendas can't compare the basic alloy materials with the original American products, so it will work hard in other areas as long as the problem can be solved. It doesn't matter what path is.

It’s a pity that both the Ascendas plant and the domestic market are still in the research and exploration stage of film cooling technology. If it is better, it can be used as a film cooling for aero engine casing, the annular combustion chamber and The film of the afterburner is cooled to the point where it can barely be made, but the quality is not very stable.

As for the most critical film cooling technology for turbine blades, there are a lot of theoretical articles, but I haven't heard of anyone actually making it.

The reason for this is not a matter of materials, but that such advanced manufacturing requirements cannot be met in the processing and manufacturing links.

In fact, domestic research on film cooling technology started as early as the 1970s, and related calculations and engineering methods have long formed a system. The key reason why there is no application is that the processing technology is not enough.

Don't look at just punching a few small holes in the parts, but these small holes are very particular. Not only the edge of the hole requires a very high finish, not only can the hole not form a high-temperature coating around it, but there should be no cracks around it.

No way, an aero engine is inherently an extremely precise thing. The slightest error may cause the engine to be scrapped. Therefore, these small holes that form the cooling of the inflatable model look inconspicuous, but they are important. An inadvertent and expensive aviation The engine may be gone.

The problem is that if these three requirements are taken out individually, a well-founded factory can still handle it, but if the three are added together, no one in the country can complete it.

In fact, it is not only domestic, but also looking at the world. Companies that can meet these three conditions at the same time do not exceed five fingers. Otherwise, the threshold of aeroengines is so high. Just a small hole on a turbine blade Many enterprises, and even the country are turned away.

Zhuang Jianye wanted to ignite the turbine power unit, but the basic materials were not good enough, and he switched to research cooling technology. Qian Qiang and others have such a solid theory and naturally understand the importance of film cooling.

Of course, the country is looking for competent companies to see if they can make such a hole. As a result, they ran a lot of places and tried a lot of equipment. Either the high-temperature coating around the hole was too thick or the finish was not enough, which led to the gas turbine power unit. Often turbine blades break and stop.

It’s not that Tengfei Factory has never thought about purchasing advanced pore processing equipment from abroad. The problem is that this type of equipment is the same as a multi-impeller shot peening machine. No matter how much money you give, people will not sell you, because this thing is really a strategy. Resources, regulated.

Because of this ~www.readwn.com~ the ignition turbine power plant of the Ascendas plant has almost come to a halt. The two big mountains of materials and manufacturing cannot be solved, and the entire project can only crawl at a turtle speed.

Just as Zhuang Jianye was unable to do anything about it, Company H actually found Zhuang Jianye's hope of breaking through adversity from the mess of information collected from Japan.

After the large-scale theory of film cooling was explained, Japanese experts with great research spirit put forward a very feasible hypothesis, which is to use hollow titanium metal tube electrodes, the outer surface is wrapped with insulating layer resin, and the top is exposed Metal, there is a negative voltage of 8 to 12V between the workpiece and the electrode.

When the strong acid electrolyte flows in from the titanium electrode tube, as soon as the positive and negative electrodes merge, a magical ionization phenomenon is formed, and a small process hole can be formed on the workpiece in an instant.

Since it adopts the electrochemical reaction principle, it is not a heat-integrated forced perforation, so the smoothness of the process hole is very well controlled, not to mention that there is no plating and cracks.

Seeing this, Zhuang Jianye can be said to have laughed. This is not the core equipment of the turbine blade film cooling hole, the electrochemical perforation equipment, the ECM device, it is really what you want.