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Chapter 289 Whatever you want comes to you

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    The method to increase the power of an aeroengine is very simple, which is to increase the temperature of the gas that drives the turbine to rotate. However, neither the combustion chamber nor the turbine blades can withstand the high temperature. As a result, they will either be burned or completely blown up.

    The gas turbine power unit made by the Jet Power Office of Tengfei Factory is currently stuck here, even though Qian Qiang, Yan Tiancheng and others copied it exactly bit by bit according to Hamilton Company's T-62t gas turbine power unit.

    Even if the size of each component is exactly the same as the original sample, once the imitation is put on the test bench, it will not last up to 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 simply because the level of metallurgy between the two countries is so different. There is no other way. The United States is still a superpower and the world's first industrial country. Because of this, the United States is unique in the world in the field of basic metallurgy.

    If we don¡¯t talk about anything else, let¡¯s just talk about the most basic aviation aluminum alloy. The United States can make it lighter and stronger, but it is difficult to achieve this in China. In the final analysis, the basic industrial field of metallurgy is not as good as others.

    As for the metallurgical process of metal materials on aircraft engines, it is even worse than that of the United States. Take the T-62t gas turbine power unit copied by Tengfei Factory. Hamilton Company began to develop it in the 1950s and finalized it in the 1960s. It has been  More than twenty years of history.

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

    Looking back at China, powder metal metallurgy is not available, but its application range is not wide. It is only used in some local applications in some engine improvements or new machine trial production, but 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 we can only focus our limited resources on a few cutting-edge projects that are urgently needed in the country.

    This has resulted in many aero-engine factories continuing to use old processes and technologies provided by the Soviet Union in the 1950s and 1960s. Yonghong Factory is the most typical example. The equipment in the factory has not changed for decades, and the technical department in the factory is very familiar with the new technology.  The technology is not without research, but it is a pity that the equipment in the factory cannot meet the requirements of the new technology, so it can only remain on paper.

    The same goes for Tengfei Factory, which is even worse than Yonghong Factory in some aspects. After all, Yonghong Factory also has a set of special equipment for aero-engine production. The gas turbine device of Tengfei Factory is still processed by various workshops.

    As for materials, those first-class materials with low output are not enough for several key trial production models, and naturally cannot be given to Tengfei Factory, so they can only use some mainstream domestic aerospace engine alloy materials at this stage.

    ¡°The gap in quality between the two has widened immediately. Coupled with the Tengfei factory¡¯s deficiencies in experience, processing, etc., it is no wonder that the test run has repeatedly failed.

    Fortunately, solving the problem of heat resistance of aero-engine parts is not just about materials. High-quality cooling technology is also a very effective solution.

    This is just like our army in the war years. It had insufficient equipment and used its tactical advantages. Tengfei Factory could not match the original American goods in basic alloy materials, so it would work hard in other aspects. As long as the problem can be solved,  It doesn't matter what path.

    It is a pity that both Tengfei Factory and China are in the research and exploration stage in film cooling technology these days. A better one can only do film cooling for the aero-engine casing, the annular combustion chamber of the engine and  The gas film in the afterburner is cool enough to be able to be produced, but the quality is not very stable.

    As for the most critical film cooling technology of turbine blades, there are a lot of theoretical articles, but I haven¡¯t heard of anyone actually doing it.

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

    In fact, domestic research on film cooling technology has begun as early as the 1970s, and the relevant calculation and engineering methods have long formed a system. The key reason why it has not been applied is that the processing technology is not up to standard.

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    There is no way, the aircraft engine is an extremely delicate thing, and the slightest error may cause the engine to be scrapped. Therefore, these small holes that form the cooling of the air mold may seem inconspicuous, but they are of great significance. If you are not careful, expensive aviation  The engine may die.

    The problem is that if one of these three requirements is taken separately, a factory with a good foundation can still cope with it, but if the three are superimposed,, several times across the country, but no one can complete it.

    In fact, not only in China, but also across the world, there are no more than five companies that can do these three things well at the same time. Otherwise, why would the threshold for aviation engines be so high? Just a small hole on a turbine blade can destroy an entire machine.  Heaps of companies and even the country shut them out.

    Zhuang Jianye wanted to develop a turbine power plant, but the basic materials were not good enough, so he turned to cooling technology. Qian Qiang and others had such solid theories, so they naturally understood the importance of film cooling.

    Of course, we looked for capable units across the country to see if they could make such holes. As a result, we traveled to many places and tried a lot of equipment. Either the high-temperature coating around the holes was too thick, or the finish was not enough, causing the gas turbine power unit to be damaged.  Turbine blades often break and stop.

    It¡¯s not like 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 pay, they will not sell it to you, because this thing is really strategic.  resources, controlled.

    Because of this, the ignition turbine power unit of Tengfei Factory has almost come to a standstill. Without solving the two big problems of materials and manufacturing, the entire project can only crawl at a crawling speed.

    Just when Zhuang Jianye was at a loss what to do, the messy information collected by H Company from Japan actually gave Zhuang Jianye hope to break the situation.

    Because after explaining a lot of theories about air film cooling, very dedicated Japanese experts put forward a very feasible hypothesis, which is to use hollow titanium metal tube electrodes, wrapped with insulating resin on the outside, and the top is exposed  There is a negative voltage of 8 to 12v between the metal, workpiece and electrode.

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

    Since the electrochemical reaction principle is used instead of heat-integrated forced drilling, the finish of the process holes is very well controlled and there are no coatings or cracks.

    Seeing this, Zhuang Jianye burst into laughter. Isn¡¯t this the core equipment of the turbine blade film cooling holes, the electrochemical drilling equipment and the ECM device? It really comes to whatever you want.

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