As soon as Xiao Weiguo returned to the Messerschmitt company in Germany, he knew that the problem of blade fatigue cracks appeared in the test of the Fenglei series engine, and now the ground test of the Fenglei jet engine has come to an end, but suddenly encountered the phenomenon of cracks in the turbine blades in the long-lasting test, and after careful inspection by the technical research team, it was determined that this was the fatigue failure of the engine turbine blades. However, in the face of such a problem, the technical research team is helpless, because they have not developed jet engines, and they are now ignorant of why the turbine blades cause fatigue failure. Even Dr. Messerschmidt has no way to take it, but fortunately Xiao Weiguo is back at this time, and it depends on him whether this problem can be solved, after all, the jet engine was developed under his overall design and guidance.

Xiao Weiguo's heart is still encountered in the wind and thunder jet engine really encountered technical problems, fatigue damage has always been a very prominent problem in aeronautical engineering, in addition to the existence of this problem in the aircraft structure, aircraft engines, especially jet engines are more prone to this problem. This is one of the reasons why the service life of jet engines is relatively short, especially in the early stage of jet engine development, the service life of jet engines is often less than 100 hours, even if it is a large aviation industry like China, it is faced with the problem of short life of jet engines, and it is not until the beginning of the 21st century that this problem is initially solved, so that the first life of domestic turbojet and turbofan engines has reached more than 1,000 hours.

The most important factor affecting the service life of the jet engine is the material and processing technology, due to the complex structure of the jet engine, and the action of a variety of loads in the work, the working environment is also quite harsh, high temperature and vibration are the culprits of fatigue cracks in engine parts. Engine turbine blades are in the hot part of the jet engine, and the requirements for materials and processes are even higher! When the turbine blades crack out. The life of the turbine blades is not long, and if the turbine blades are broken, then the consequences are quite serious.

In the process of long-lasting test run, the wind and thunder jet engine only completed 30 hours of long-term test run, and a relatively serious crack in the turbine blades appeared, and this problem was not solved. Then the Thunder Jet Engine is an unstable and unreliable engine, because after more than thirty hours, it can have a serious accident at any time. If the turbine blades of the aircraft are ruptured during flight, the lightest consequences are engine shutdown, and even an explosion will occur, resulting in the destruction of the aircraft and the death of people! Even if the engine stops, it is quite dangerous, and a twin-engine aircraft is fine, if it is a single-engine aircraft. Most of the results are crashes. The design service life of the wind and thunder engine must reach at least 100 hours, so this problem is quite serious.

The longevity of early jet engines is a rather empty question, and even in another history, none of the jet engines developed by Germany in World War II had a lifespan of more than 50 hours. The problems with the German jet engines of World War II were not only due to the materials, but also to the immaturity of the design. Axial engines are conceptually more advanced than centrifugal engines, but have a higher technical threshold. The early models were slightly less performant than their contemporaries and were much less reliable. This was true even for engines in Britain and the United States, which used precious metals to resist heat, and the Germans lacked precious metals in World War II and used carbon steel to make heat-resistant parts.

Now the question is. There are still problems with the processing process of the high-temperature alloys used in the wind and thunder jet engine, or the turbine blades, which leads to early cracks in the engine turbine blades. The simpler solution is to reduce the thrust of the engine, that is, to reduce the temperature before the turbine, so that the heating of the turbine blades is greatly reduced due to the decrease in the temperature before the turbine. The service life of turbine blades can naturally be increased. However, in this way, the thrust of the wind and thunder engine will be reduced by more than 30 percent, and such a plan is naturally not the best plan.

If the performance of the engine is not changed, then it is necessary to improve the heat resistance temperature of the superalloy of turbine blades, that is, to improve the formula and processing technology of the alloy material. In this way, the development progress of the wind and thunder engine will be delayed indefinitely. Again, this is an unacceptable outcome.

The technical coordination meeting on the turbine blade problem of the wind and thunder jet engine was held in the Messerschmitt company, because of Xiao Weiguo's return, Messerschmitt and all the members of the research team pinned their hopes on Xiao Weiguo. In addition to the designers and technicians of Messerschmidt, there were also technicians from BMW's engine department, because some parts of the Thunder engine are manufactured by BMW.

The meeting started promptly at 9 a.m. First of all, Dr. Messerschmidt read out the report on the fatigue crack accident of the turbine blade of the wind and thunder engine, in which the research team also conducted a limited analysis of the causes of the fatigue crack of the turbine blade and put forward suggestions for improving the superalloy material in the West.

After reading this report, Messerschmidt said with a solemn expression: "Ladies and gentlemen, the fatigue crack problem of the turbine blades of the wind and thunder engine is a very serious problem that must be solved urgently, and if this problem cannot be effectively solved, our jet engine project will fall into a situation of indefinite delay." As you know, we invested five million dollars in the jet engine project, and if those investments don't pay off as quickly as possible, or even go down the drain, then how do we account for the company's shareholders? Of course, we are also very dedicated in the development of the wind and thunder jet engine, which I want to thank you on behalf of the company's shareholders, and I am also very clear that this problem is a very tricky problem, the wind and thunder jet engine is a new type of aviation power, we are the first to turn the jet engine into a real company that can be used in aircraft, maybe we are thinking that we can reduce the thrust of the wind and thunder jet engine, or shorten its service life, and also let it be put into mass production! ”

Speaking of this, Messerschmidt changed the conversation again: "However, we are a world-famous large-scale military enterprise, and our dragon soul corporate culture tells us that we can't do this!" What we hand over to customers must be a stable and reliable engine product! It's about our reputation! Fortunately, our chairman, Mr. Philip, returned from distant China yesterday, and we asked Mr. Philip to share his opinion, and perhaps everyone can find a solution to the problem from his opinion. ”

After saying this, Messerschmidt turned his head and said to Xiao Weiguo, who was sitting next to him: "Philip, you can tell everyone about it!" (To be continued.) )

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