After checking the data, we know what the problem is, so the next thing is much simpler. The bearing temperature is too high, and there are most likely two problems.


    First of all, it is the bearing itself. Due to the accuracy and materials, the friction coefficient is too large, resulting in heating. However, the cooling speed of the cooling system is not enough, which leads to the rapid increase of the bearing temperature and overheating.


    The second problem is the cooling system.


    However, the bearing on their engine is not an ordinary bearing in the market, but a bearing processed by Wang Bin and Tiangong technology. The precision level is very high, even much higher than the bearing with the highest precision level in the market, reaching the level of first-class classic. At the same time, after processing, it has been tested for many times, Finally, before installation on the engine, the engine installation engineer, that is, Professor poke himself, will also conduct the most rigorous inspection on the bearing. Only when it meets the standard can it be installed on the engine, so there is absolutely no problem in precision.


    As for the materials, it is even less likely to have problems. After all, the materials used in this aeroengine bearing are also high-performance bearing steel materials produced by Tiangong technology. According to the performance, they can work normally at a temperature of nearly 2000 degrees.


    Although the temperature in front of the turbine will reach two or three thousand degrees according to the state of the engine during operation, it is obviously impossible for the temperature of the bearing to reach this level under the action of the cooling system. At most, the temperature of one thousand degrees is already very high, and it is impossible to exceed two thousand degrees.


    Thinking of this, poke Lao has roughly judged which aspect appears. He judged that there must be a problem with the cooling oil circuit system, so he immediately ordered to immediately check the cooling oil pipeline of the engine test bench to see if there is any problem with the cooling system.


    After listening to Professor Zhang''s words, the door of the control room was automatically opened, and the personnel in the control room entered the workshop again.


    At this time, perhaps he noticed that Wang Bin was in a bad mood. Professor poke comforted Wang Bin: "please don''t worry, Mr. Wang. According to my experience, there is a probability of more than 90% of the problems this time, which is not the cause of the flight itself, but the cause of our test bench.


    Because if it is caused by the engine itself, there is no need to wait until now. There will be problems when the cruise power turns to the state just now. After all, the operation time just now under the cruise power turns to the state has reached one hour!


    What''s more, in the afterburner test just now, the engine has persisted for three minutes. Even if there are problems in this regard, in fact, according to certain standards, the engine is successful.


    Generally, it is impossible for an aircraft to fly under afterburner. After all, no matter what kind of engine it is, if the afterburner is turned on, it will be a great challenge for both the engine and the aircraft itself, which will greatly shorten the service life of the engine and the aircraft itself.


    In addition, under normal circumstances, the afterburner combustion state of aircraft engines is basically different and lasts for too long. Basically, it can only last for a few seconds or even tens of seconds and minutes. Even some excellent engines now can not last more than ten minutes if afterburner combustion is started. All our engines are in force The combustion phase can last about three minutes, which is a very good level, so in fact, our engine has been successful.


    Of course, according to our previous design data, in fact, this engine is not successful, because in our design drawings, this engine will last for at least 15 minutes to more than half an hour in the afterburner stage. After all, the materials we use are not ordinary materials, but the best high temperature and high pressure resistant materials in the world. "


    After listening to Professor Poke''s words, Wang Bin didn''t speak, but just nodded. After all, he didn''t need to poke the professor. He also knew that, after all, he had made up a lot of aerospace knowledge during this period of time.


    What''s more, if we really follow the design data, this is only primary afterburner combustion. You know, although this engine is only a first-generation engine, this engine is not simple. It has not only primary afterburner, but also secondary and tertiary afterburner combustion.


    According to the requirements of design data, under the condition of primary afterburner, the engine must last for at least 15 to 30 minutes before it is qualified. At the same time, the thrust must also reach more than 130 kn, while the secondary afterburner must last for at least five minutes, the thrust must reach at least 150 kn, and the highest tertiary afterburner, Hold on for at least 15 minutes, and the thrust must reach more than 170 kn.


    However, the engine is not perfect at this time. Due to the test bench and other reasons, the engine can not enter the capacity of secondary and tertiary afterburner combustion, but even so, it is only a little more than three minutes when the primary afterburner is turned on. If it is really the engine, Then it is obvious that this engine is still unqualified.


    Seeing these flight experts and young technicians being inspected in the workshop, Wang Bin not only prayed silently in his heart: "I hope it is not the engine itself. Otherwise, it will be a big trouble, and many follow-up plans will be delayed or even pushed back."


    At this time, Professor poked, opened his mouth again and said to Wang Bin, "President Wang! Let''s go to the workshop and have a look!"


    Wang Bin nodded. They walked out of the glass control room, entered the workshop and came to the test bench.


    "Lao Dai, did you find anything wrong?" Professor poke asked an old man aside after he came to the workshop.


    "I haven''t found any problems yet, but according to my estimation, there should be problems on the test bench.


    Because this simple test bench is not a formal test bench, and according to the prediction during the previous construction, the test bench can bear the maximum thrust, only about 25 tons. If there is a slight error during the construction, the test bench may have problems! "


    Although they have basically determined that there is a problem in the test bench, no one dares to eliminate the engine at this time. After all, the problem has not been found yet.


    As time went by, more than ten minutes passed quickly. When Wang Bin and Professor Zhang and others gradually raised their hearts, a young technician who was checking the link between the engine and the test bench suddenly shouted, "I found the problem. The screws of the coolant pipeline of the engine cooling system are loose."


    When everyone heard the young technician''s words, everyone''s heart was relieved at once, and Professor poke said, "well, since you find the problem, replace the engine immediately and retest it. At the same time, you must make sure that there is nothing wrong with each pipeline link."


    After listening to Professor Zhang''s words, these young technicians immediately found a hydraulic cart dedicated to lifting the engine, and with all hands and feet, unloaded the engine on the test bench and installed a new engine.